JPH0675704A - Device access exclusive control method for semiconductor disk device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a device access exclusive control method for a semiconductor disk device, and it is an object of the present invention to reduce the busy rate during memory access, realize efficient exclusive control, and improve device performance. And [Structure] The access unit of the device 6 and the unit of exclusive control are set as extents, and the resource manager 7
When an extent acquisition request occurs, the entry table 9 and the queue table 10 are searched, and if the extent is not registered in any table, it is determined that no conflict occurs, and a new entry table 9 is created. Register and acquire extents. If the extent is registered, it is determined that conflict has occurred, and the queue table 10 corresponding to the entry in which conflict has occurred,
Register that there is a new wait state. By repeating these processes, exclusive control at the time of device access is configured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device access exclusive control method for a semiconductor disk device which is most suitable for a CKD-EX command system.

[0002]

2. Description of the Related Art FIG. 7 is an explanatory view of a conventional example.
FIG. 7 is an explanatory diagram of a magnetic disk (recording medium), and FIG. 7B is an explanatory diagram of a memory section (track memory) of the semiconductor disk device.

Conventionally, a semiconductor disk device (Solid
An external storage device called State Disk (SSD) has been known. This semiconductor disk device is a device that uses a semiconductor memory as a storage medium and virtually executes the input / output processing of the magnetic disk device.

By the way, the exclusive control at the time of device access in the magnetic disk device which has been conventionally used has been performed on a device-by-device basis. This is a magnetic disk device (hereinafter, a magnetic disk device is simply referred to as “DASD”: Dire
Due to the hardware aspect of ct Access Storage Device), when one device performs input / output processing, multiple processing is not allowed (because of mechanical operation), and an input / output control device (channel adapter)
However, it is limited to one.

However, since the semiconductor disk device uses a semiconductor memory instead of a disk as a device (no mechanical operation is involved), there is no limitation in terms of hardware such as DASD.

For this reason, a plurality of input / output processes for one device can be processed at the same time, and therefore the unit of access is a cylinder (cylinder NO. 0, NO. 1, NO.

In the semiconductor disk device, device access is performed in cylinder units because DA from the host computer is used.
This is because the DASD serves as a unit for reading and writing without moving the head in SD access.

However, no matter how much the device is a semiconductor memory, it is not possible to permit overlapping read / write operations in the same area, so it is necessary to perform exclusive control. But,
In order to speed up DASD access, the CKD-EX system will be adopted in the future, instead of the CKD system, which is the conventional interface form between the host and DASD.

The CKD-EX system is a command format designed to enable execution of input / output processing of "multiple input / output devices-devices" from the conventional "single input / output devices-devices". is there.

In this CKD-EX system, an "extent" (EXTENT) is used when accessing a device.
Specify the range called. For example, in the example of FIG. 7B,
The extent is changed to “CYLINDER = 0, HEAD =
2 to CYLINDER = 2, HEAD = 0 ”.

This designation is made for cylinder N0.0 and head N.
O. Track No. 2 shown in FIG. 2 from the cylinder N0.
2, head NO. Track No. 0 It indicates that the range up to 0 (the range is specified by cylinder number + head number) is the extent range.

By specifying such an extent, 1
It is avoided that one input / output device occupies the entire one device. However, for this purpose, the hardware of the input / output side must be changed.

By adopting the CKD-EX system, the DASD in the conventional cylinder unit is adopted in the semiconductor disk device.
From access, "extent" as shown in Figure 7B
It will have to be changed to access in units of tracks called.

In DASD access in "extent" units, it is possible to access in smaller units than in device units by specifying cylinders and heads (tracks). Therefore, access from the host is "extent". As long as they don't overlap, they can be accessed at the same time.

When an area on the device is designated by the "extent", the area is reserved (reserved) so that it can be accessed only by the designated host until the "extent" is released.

Therefore, once the "extent" is secured, the device is not in the busy state as long as the host accesses the area of the "extent".

[0017]

SUMMARY OF THE INVENTION The above-mentioned conventional devices have the following problems. (1) In the semiconductor disk device, unlike the conventional DASD, the access unit is not the device but the cylinder unit. However, in this method, the minimum unit of DASD access is more than the method specified by the “extent”. Becomes larger and reserves more area than necessary.

In this case, even if the area is not actually used, once it is reserved, it responds to the access from another host with "device busy" and cannot be used. . Therefore, the busy rate during memory access is high, and the efficiency of memory access is not good.

(2) When the CKD-EX system is adopted, memory access efficiency can be improved by simply designating by extent (designating a range by cylinder NO and head NO) as in the above-mentioned conventional example. Good exclusive control is not possible. However, a memory access efficient exclusion control method has not been developed, and it is difficult to improve the memory access efficiency even if the CKD-EX method is adopted.

The present invention solves such a conventional problem, and in a semiconductor disk device adopting the CKD-EX system, reduces the busy rate at the time of memory access and realizes efficient exclusive control of the semiconductor memory. , The purpose is to improve the device performance.

[0021]

FIG. 1 is a diagram for explaining the principle of the present invention. In FIG. 1, 1 is a host, 2 is a channel, 3 is a semiconductor disk device (SSD), 4 is a channel adapter,
Reference numeral 5 is an internal bus, 6 is a track memory, 7 is a resource manager, 8 is a table storage, 9 is an entry table, and 10 is a queue table.

In order to solve the above problems, the present invention has the following configuration. (1) A device 6 using a semiconductor memory as a storage medium, a channel adapter 4 for input / output control, and an exclusive control unit (resource manager 7, table storage 8) for exclusive control of access to the device 6. In the device access exclusive control method of the semiconductor disk device 3 which comprises and virtually executes the input / output control of the disk device, the unit of access to the device 6 is:
The range (extent) of the storage area represented by the cylinder number and the head number (track number) is set, and in accordance with this, the unit for performing the exclusive control is the range (extent) of the storage area, and the exclusive control is performed. An entry table 9 for registering entries in the range (extent) of the storage area in a part of the copy (table storage 8)
And a queue table 10 for registering a queue for entry registration waiting, and when the device 6 accesses the channel adapter 4 to acquire a range (extent) of the storage area, the exclusive control is performed. In the section, the entry table 9 and the queue table 10 are searched, and it is confirmed whether or not there is registration of a range (extent) of the above-mentioned storage areas that compete with each other.
: As a result, the range of the storage area (extent)
However, if it is not registered in any of the tables, it is determined that no conflict will occur and the new entry table 9
The range (extent) of the above-mentioned storage area is acquired by registering in the storage area. : If the range (extent) of the storage area is registered in the entry table 9 or the queue table 10, it is determined that contention has occurred, and the queue table 10 corresponding to the entry in which the contention has occurred newly has a waiting state. Register that there is. In addition, competition information indicating that a competition has occurred is registered in the flag portion (F) of the corresponding table. More than,
, Is repeated, and after the above process is completed,
Access to the device (6) by the channel adapter 4 is started.

(2) In the processing of the above configuration (1), when the range (extent) of the storage area is registered in the entry table 9 or the queue table 10, its attribute (read only or read / write) is also set. If the range of the competing storage areas (extent) is registered in the entry table 9 or the queue table 10 as a result of the above-described processing, the exclusive control unit further: It is confirmed whether the attribute of the area range (extent) and the attribute of the storage area range (extent) on the table competing with the area are all read only (reading of data only).
: As a result, if all are read-only, it is determined that no conflict will occur, and a new entry table 9 is registered to acquire the range (extent) of the storage area. The above processing is performed, and after the above processing is completed, the access to the device 6 by the channel adapter 4 is started.

(3) In the above configuration (1) or (2), when the channel adapter 4 issues a request to release the range (extent) of the storage area after the access to the device 6 is completed, the exclusive control unit Then: Check the conflict information in the entry registered in the entry table 9. : As a result, if no conflict has occurred, the requested entry is deleted and the range (extent) of the storage area is released. : If contention has occurred, is the range (extent) of the storage area taken out from the head of the queue table 10 owned by the range (extent) of the storage area, and is there a conflict with other entries / queues in sequence? Confirm whether or not. as a result,
If there is a conflict, clear that queue, pick the next queue, and see if it is in conflict with another entry / queue. As a result of the processing of :, if there is no conflict, the range (extent) of the extracted storage area is registered in the entry, and the range (extent) of the storage area is acquired. Through the above processes (1) to (5), the storage area range (extent) is released, and after the above processing is completed, the storage area of the storage area is returned to the channel adapter 4 waiting for the acquisition of the storage area range (extent). Added notification that a range (extent) has been acquired.

[0025]

The operation of the present invention based on the above configuration will be described with reference to FIG. : The process of acquiring the range (extent) of the storage area is performed as follows. Resource manager (RM) 7
Then, when a request for acquisition of the storage area range (extent) is made, the entry table 9 and the queue table 10 are searched to confirm whether or not the competing storage area range (extent) is registered.

As a result, when the competing storage area range (extent) is not registered in any table,
Entry table 9
A range of storage area (extent) is newly registered in. As a result, the range (extent) of the storage area is acquired.

However, when the competing storage area range (extent) is in the entry table 9 or the queue table 10, the attributes of the requested storage area range (extent) and the storage on the table competing with the attribute. It is confirmed whether the attributes of the area range (extent) are all "Read Only" (check the flag portion F).

As a result, if all are “read only”, it is not judged that conflict has occurred, and the range (extent) of the storage area is registered in the new entry table 9.
However, if there is a storage area range (extent) that is not "read only", it is determined that conflict has occurred.

In this case, it is not possible to register the range (extent) of the storage area in the entry table 9 because of the conflict occurrence. Therefore, the fact that there is a waiting state is newly registered in the queue table 10 corresponding to the entry in which the conflict has occurred (the range of the storage area is registered in the queue table 10).

Then, the competition information is registered in the flag portion F of the entry table 9 or the queue table 10 in which the competition has occurred. Through this processing, the relevant channel adapter 4 is notified of the conflict.

Further, when there is a conflict in the range (extent) of a plurality of storage areas, all the storage area ranges (extents) are newly registered in the queue table 10, and the entry table 9 or the queue table 1 is used.
The conflict information is registered in the flag portion F corresponding to the range (extent) of the storage region in which the conflict has occurred in the range (extent) of the storage region registered in 0.

As described above, no conflict occurs,
When registered in the entry table 9, the resource manager 7 notifies the requested channel adapter 4 that the storage area range (extent) has been acquired. The channel adapter 4 which has received this notification starts access to the track memory 6.

The process of releasing the range (extent) of the storage area by the resource manager 7 is performed as follows. When a request for releasing the range (extent) of the storage area on the entry is made, the resource manager 7 searches the entry table 9 and sets the flag part F in the entry.
Check the competition information at.

As a result, if no conflict has occurred, the entry is cleared and the storage area range (extent) is cleared.
Open up. However, when contention occurs, the storage area range (extent) is extracted from the head of the queue table 10 owned by the storage area range (extent), and the entry table 9 and the queue table 10 are searched.

In this search, it is confirmed whether or not the range (extent) of the fetched storage area conflicts with another entry / queue. If there is no conflict, the range of the extracted storage area (extent) is registered in the entry (the queue registered in the queue table 10 is moved to the entry table 9), and the range of the storage area (extent). ) Is notified to the channel adapter 4 waiting for registration that the range (extent) of the storage area has been acquired.

In the above process, if it is determined that a conflict has occurred, the queue is cleared, and if there is a next queue, the search process of the entry table 9 and the queue table 10 is repeated. If there is no queue, the entry is cleared and the storage area range (extent)
Open up.

In this way, the busy rate at the time of contention of the range (extent) of the storage area can be reduced, and the device access exclusive control most suitable for the CKD-EX command system can be realized as the semiconductor disk device. .

[0038]

Embodiments of the present invention will be described below with reference to the drawings. (Description of First Embodiment) FIGS. 2 to 5 are views showing a first embodiment of the present invention. In FIGS. 2 to 5, the same parts as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, the semiconductor disk device is equipped with CKD.
-This is an example when the EX command system is adopted. Therefore, in order to match the CKD-EX command system, the width (access unit) of an area that can be accessed once for a device is changed from one cylinder to an extent (EXTE).
NT).

Along with this, the unit for performing exclusive control is an extent (designation of a range by a cylinder number and a head number). In the following explanation, the cylinder number and
The range of the storage area specified by the head number (track number) is called "extent".

In the command system called CKD-EX, when the extent is designated before the device is accessed, the attribute of access (read only, read / write, etc.) to the designated extent is designated.

As a characteristic of the semiconductor disk device, "If the read operation is the only access to the same area,
At the same time, it can be accessed from multiple channel adapters. When the extents of only the read operation (Read Only) overlap (conflict) in the exclusive control, both extent use requests are permitted.

As a result, the unit of exclusive control becomes an extent, the access width becomes wider than the conventional cylinder unit access, and even if the probability of extent competition increases, the busy rate due to contention can be reduced to some extent. Becomes The details will be described below.

Description of the configuration of the semiconductor disk device ...
-Refer to FIG. 2 The semiconductor disk device in 1st Example is shown in FIG. As shown in the figure, the semiconductor disk device 3 includes a channel adapter (CA).
4, Track Memory: T
M) 6, Resource Manager (Resource Man)
ager: RM), 8 is table storage (Tabl
e Storage: TS) etc., and these are
It is connected by the internal bus 5.

The semiconductor disk device 3 is also connected to a plurality of hosts (HOST1, HOST2, ... HOSTX) 1 via a channel (CH) 2. In this case, the semiconductor disk device 3 has a plurality of channel adapters (CA1, CA2, ...
CAX) 4 is provided for each of the above channels (CH
1, CH2, ... CHX) 2.

The channel adapter 4 performs input / output processing with the channel 2 or control (command processing from the channel, track memory access processing, data transfer control with the channel, etc.). It constitutes an input / output control unit.

The track memory (TM) 6 constitutes a semiconductor memory unit, and inside thereof, a "memory access controller: MAC" which is a control unit of the memory.
(Not shown) is also included.

The resource manager (RM) 7 is a module that specializes in exclusive control of access to the track memory (TM) 6, and a table storage (TS) 8
Exclusive control is performed by using the various tables set in. This exclusive control is performed when there is a request from the channel adapter 4.

In the semiconductor disk device 3, exclusive control for device access between the channel adapters 4 is performed by the resource manager (RM) 7 when the channel adapter 4 receives the extent information from the channel 2.
Is notified in the form of an extent use request command.

When the command from the channel adapter 4 is received, the resource manager (RM) 7 checks the entry table for exclusive control and the queue table (details will be described later) in the table storage (TS) 8 to perform exclusion. The control is performed and the presence or absence of the right to use the extent is notified as a command to the requested channel adapter 4.

Description of Entry Table / Queue Table in Table Storage ... See FIG. 3 The following entry table / queue table is set in the table storage (TS) 8 and the resource manager (RM) is set. 7 is used when performing exclusive control.
Therefore, these table data are processed by the resource manager (RM) 7 (registration / deregistration, etc.).

-1: Description of entry table ...
See FIG. 3A. The entry table is a table for declaring that the usage right of the extent to be used is acquired, and the extent range can be registered and attributes such as user and usage condition can be registered. ing.

In FIG. 3A, "F" is a flag, and two kinds of flags "BIT 0" and "BIT 1" can be set. In this case, "BIT
“0” is a flag indicating the attribute of the extent,
“BIT 1” is a flag that indicates the presence or absence of conflict.

Then, in the flag of "BIT 0",
If "BIT 0" = "0", then "Read / Write
e "(reading and writing of data)," BIT 0 "=
If it is "1", it indicates "Read Only" (only data reading).

Further, in the flag of "BIT 1", "B 1
If "IT 1" = "0", it indicates that no conflict has occurred, and "BI
If T 1 ”=“ 0 ”, it indicates that competition has occurred. "TC
“C” (top cylinder number) + “T-HD” (top head number) is the top track (Top) of the extent.
"Cylinder / Head)" and indicates "B-CC"
(Bottom cylinder number) + "B-HD" (bottom head number) is the trailing track of the extent (Bott).
om Cylinder / Head).

Therefore, "T-CC" + "T-HD",
“B-CC” + “B-HD” indicates the extent range. It should be noted that "T-HD" and "B-HD" are track numbers indicated by head numbers (tracks are designated by head numbers).

Incidentally, in correspondence with each entry (1, 2, 3, ... N) registered in the entry table,
Each owns a queue table. -2: Description of queue table ... See FIG. 3B The queue table exists corresponding to each of the elements of the above entry table, and is used for waiting when an entry cannot be registered. Is.

Since the structure of the queue table is the same as that of the above entry table, its explanation is omitted. : Description of Extent Acquisition / Release Processing -1: Description of Extent Acquisition Processing--See FIG. 4 FIG. 4 is a diagram showing extent acquisition processing by the resource manager (RM) 7. 4 will be described. Incidentally. Each processing number in FIG. 4 is shown in parentheses.

As described above, when the channel adapter 4 receives the extent information from the channel 2, it notifies the resource manager (RM) 7 by the extent use request command.

When the resource manager (RM) 7 receives a command from the channel adapter 4, it checks the entry table 9 for exclusive control and the queue table 10 in the table storage (TS) 8 to perform exclusive control, As a command, the presence or absence of the right to use the extent is notified to the requested channel adapter 4.

In this case, in the channel 2, the extent designation is performed by, for example, "CYLINDER" as described above.
= 0, HEAD = 2 to CYLINDER = 2, HEAD
= 0 ”.

At this time, in the channel 2, the extent attribute (Read Only or Read / Wri is read.
te) is specified. Then, these pieces of designation information are sent from the channel 2 to the channel adapter 3 as the extent information, and are further notified to the resource manager 7 (generation of extent acquisition request). Hereinafter, the process of the resource manager 7 will be described in detail.

In the resource manager (RM) 7, when an extent acquisition request is generated as described above, first, the existing entry table 9 and queue table 1
0 is searched (S1), and it is confirmed whether or not there is registration of a competing extent (whether or not there is an extent) (S2).

As a result, if no competing extent is registered in any of the tables, it is determined that no conflict has occurred. In this case, the extent is newly registered in the entry table 9 (S3). The extents registered in the entry table 9 are called "entries" (entry 1, entry 2, ... Entry N).

However, when the competing extents are in the entry table 9 or the queue table 10 (S2), the requested extent attributes and the extent attributes on the table competing with them are all "Read Only". Is checked ("BIT 0" of the flag portion F is checked) (S4).

As a result, if all are "Read Only", the extent is registered in the new entry table 9 without determining that a conflict has occurred (S3). However, if there is an extent that is not "Read Only" (S4), it is determined that conflict has occurred.

In this case, the extent cannot be registered in the entry table 9 because of the conflict occurrence. Therefore, the fact that there is a waiting state is newly registered in the queue table 10 corresponding to the entry that has caused a conflict (the extent is registered in the queue table 10). The extents registered in the queue table 10 are called "queues" (queue 1, queue 2, ...).
Queue N).

Then, "BIT" in the flag portion F of the entry table 9 or the queue table 10 in competition with each other.
"1" (a flag indicating the type of competition) is set to "1" (S6). Through this processing, the relevant channel adapter (CA) 4 is notified of the conflict.

When a plurality of extents conflict with each other, all the extents are newly registered in the queue table 10, and the extents registered in the entry table 9 or the queue table 10 are
"BIT 1" (flag indicating the type of conflict) of the flag portion F corresponding to the extent in which conflict has occurred is set to "1".

For example, if the requested extent conflicts only with the extent registered in the entry table 9 (not registered in the queue table 10), the requested extent is assigned to the queue table 1.
0 is set, and “BIT 1” (flag indicating the type of conflict) of the flag part F of the extent (extent in which conflict has occurred) registered in the entry table 9 is set to “1”.

If the requested extent conflicts with the extent registered in the entry table 9 and also with the extent registered in the queue table 10 (a conflict occurs with a plurality of extents), the request is issued. Queue table 10
To the extents registered in the entry table 9 and the extents registered in the queue table 10 (extents in which a conflict has occurred) “BIT 1” (a flag indicating the type of conflict) in the flag portion F. Set to "1".

As described above, no conflict occurs,
When registered in the entry table 9, the resource manager 7 notifies the corresponding channel adapter (requested channel adapter) 4 that the extent has been acquired. The channel adapter 4 which has received this notification starts access to the track memory 6.

-2: Description of extent release processing
.. Refer to FIG. 5. FIG. 5 is a diagram showing the extent release processing by the resource manager (RM), which will be described below with reference to FIG. Incidentally. Each processing number in FIG. 5 is shown in parentheses.

In this processing, when the channel adapter 4 finishes the access to the track memory 6, the channel adapter 4 notifies the resource manager 7 of that fact and requests the release of the extent.

The resource manager 7, which has received this request, carries out extent release processing to release the extents registered in the entry table 9. In this case, when the extent registered in the entry table 9 is released, the extent of the queue table waiting to be registered in the entry table 9 is registered in the entry table 9.

When these processes are completed, the channel adapter 4 is notified. Below, resource manager 7
The process will be described in detail. When the extent release request on the entry is generated as described above, the resource manager 7 searches the entry table 9 and confirms the conflict bit in the flag part F in the entry (S1).
1) Do. That is, the determination is made by checking "BIT1" (a flag indicating the type of competition) in the flag portion F.

As a result, if no conflict occurs, the entry is cleared and the extent is released (S1
3). However, if contention occurs (S11), the extent is taken out from the head of the queue table 10 owned by the extent (S14), and the entry table 9 and the queue table 10 are searched (S1).
5).

In this search, it is confirmed whether or not the extracted extent is in conflict with another entry / queue (S16). If there is no conflict, the extracted extent is registered in the entry (the queue registered in the queue table 10 is moved to the entry table 9), and the channel adapter 4 waiting for the extent registration is registered. On the other hand, the fact that the extent has been acquired is notified (S20).

If it is determined in the above process (S16) that a conflict has occurred, the queue is cleared (S17).
If there is a next queue (S18), the above process (S
Repeat from 14), but if there is no next queue,
The entry is cleared (S19) and the extent is released (S13).

Note that, as described above, causing a conflict with another entry / queue means causing a conflict with a plurality of entries / queues during the entry registration process, and the entry having the conflict has the property. The same extent is also registered in the queue table.

Therefore, the extent fetched from the queue table owned by the entry is not registered in the entry, the next queue is fetched and the competition is confirmed. Then, if no queue exists in the queue table 10, the extent release processing ends.

In this case, nothing is notified to the channel adapter 4 waiting for acquisition. (Explanation of Second Embodiment) FIG. 6 is a block diagram of a semiconductor disk device according to a second embodiment of the present invention.
The same parts as those are indicated by the same reference numerals. Reference numeral 11 indicates a path selection array (PSA).

This embodiment is an example in which the channel adapter 4 performs the exclusive control performed by the resource manager (RM) 7 in the first embodiment, and the configuration of the semiconductor disk device 3 is shown in FIG. .

In this example, the semiconductor disk device 3 is used as a path selection array (PathSelection).
Array: PSA) 11, channel adapter 4,
It is composed of the track memory 6 and the like.

The path selection array 11 includes the channel adapters 4 (CA1, CA2, ... CAX) 4
Therefore, the entry table and the queue table, which are equally accessible memories and have been set in the table storage (TS) of the first embodiment, are set therein.

In addition, the channel adapters (CA1, C
A2, ... CAX) 4 processes commands from the channel 2, accesses the track memory 6 and controls data transfer with the channel 2. In this embodiment, Furthermore, the exclusive control that was performed by the resource manager (RM) of the first embodiment is also performed.

That is, in the case of the semiconductor disk device 3 of this configuration, the exclusive control for the access of the track memory 6 between the channel adapters 4 is such that each channel adapter 4 accesses the path selection array 11 respectively.
Processing is performed using the entry table and the queue table set in the path selection array 11.

The exclusive control of this embodiment is the same as the first control described above.
The description is omitted because it is the same as the embodiment. (Other Embodiments) Although the embodiments have been described above, the present invention can be implemented as follows.

(1) The invention can be similarly applied to a semiconductor disk device having a configuration different from that of the above embodiment. (2) The entry table and the queue table may be configured differently from the above embodiment.

[0090]

As described above, the present invention has the following effects. (1) In the semiconductor disk device adopting the command system based on the CKD-EX system, exclusive control for device access can be efficiently executed.

(2) Since the device access by extent (cylinder number + head number) can be efficiently realized as compared with the conventional cylinder-by-cylinder access, the busy rate at the device access is reduced. Therefore, the device access efficiency is improved and the performance of the semiconductor disk device can be expected to be improved.

(3) By performing the exclusive control in consideration of the extent attribute, the busy rate can be further reduced, and further improvement of the performance of the semiconductor disk device can be expected.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a system configuration diagram of a first embodiment of the present invention.

FIG. 3 is an explanatory diagram of an entry table / queue table in the first embodiment of the present invention.

FIG. 4 is a processing flowchart (part 1) of the first embodiment of the present invention.

FIG. 5 is a processing flowchart (2) of the first embodiment of the present invention.

FIG. 6 is a system configuration diagram of a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 host 2 channel 3 semiconductor disk device 4 channel adapter 5 internal bus 6 track memory 7 resource manager 8 table storage 9 entry table 10 queue table

Claims (3)

[Claims] 1. A device (6) using a semiconductor memory as a storage medium, a channel adapter (4) for controlling input / output, and an exclusive control section (7, 7) for performing exclusive control of access to the device (6). In the device access exclusive control method of the semiconductor disk device (3), which comprises 8) and virtually executes the input / output control of the disk device, the unit of access to the device (6) is a cylinder number and a head number. In addition to the range (extent) of the storage area represented by (track number), in accordance with this, the unit for performing the exclusive control is the range (extent) of the storage area, and a part (8 ), An entry table (9) for registering entries in the range (extent) of the storage area, and a queue for waiting for entry registration. And a queue table (10) for registering are registered, and when a request to acquire the range (extent) of the storage area by the channel adapter (4) occurs at the time of accessing the device (6), the exclusive control unit ,: Entry table (9) and queue table (1
0) is checked, and it is confirmed whether or not there is registration of a range (extent) of the above-mentioned storage area that conflicts. : As a result, if the range (extent) of the storage area is not registered in any table, it is determined that conflict does not occur, and the new entry table (9) is registered, whereby the storage area The range (extent) is acquired. : When the range (extent) of the storage area is registered in the entry table (9) or the queue table (10), it is determined that contention has occurred, and in the queue table (10) corresponding to the entry causing the contention, Register a new wait state. In addition, competition information indicating that a competition has occurred is registered in the flag portion (F) of the corresponding table. A device access exclusive control method for a semiconductor disk device, characterized in that the above process is repeatedly performed, and after the above process is completed, access to the device (6) by the channel adapter (4) is started. 2. In the above process, when registering the range (extent) of the storage area in the entry table (9) or the queue table (10), the attribute (read only or read / write) is also registered. Every other time, as a result of the above processing, when the competing storage area range (extent) is registered in the entry table (9) or the queue table (10), the exclusive control unit further requests: It is confirmed whether the attributes of the range (extent) of the storage area and the attributes of the range (extent) of the storage area competing with the storage area are all read-only (reading of data only). : As a result, if all are read-only, it is determined that no conflict occurs, and a new entry table (9)
The storage area range (extent) is acquired by registering in the storage area. 2. The device access exclusive control method for a semiconductor disk device according to claim 1, wherein the above process is performed, and after the above process is completed, access to the device (6) by the channel adapter (4) is started. 3. When the channel adapter (4) issues a request to release the range (extent) of the storage area after the access to the device (6) is completed, the exclusive control unit :: entry table (9) Check the above competition information in the entry registered in. : As a result, if no conflict has occurred, the requested entry is deleted and the range (extent) of the storage area is released. : When contention occurs, the storage area range (extent) is extracted from the head of the queue table (10) owned by the storage area range (extent),
Sequentially check if there is a conflict with another entry / queue. As a result, if there is a conflict, that queue is cleared, the next queue is taken out, and it is confirmed whether there is a conflict with another entry / queue. If, as a result of the processing of :, no contention has occurred, the range (extent) of the extracted storage area is registered in the entry, and the range (extent) of the storage area is acquired. Through the above processes (1) to (5), the storage area range (extent) is released, and after the above processing is completed, the channel adapter (4) waiting to acquire the storage area range (extent) stores 3. The device access exclusive control method for a semiconductor disk device according to claim 1, wherein the fact that the area range (extent) has been acquired is notified.