JPH10320126A - Volume allocation system and medium recording volume allocating program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimize volume allocation and to improve an access response and throughput in a volume allocation system having a logical volume group divided into plural logical volumes. SOLUTION: In the case of a disk array system after preparing an allocation candidate list 37, logical volume constitution information is acquired from an I/O constitution information managing means 41 in each allocated logical volume, another logical volume in the same logical volume including the allcoated volume is set up in an allocated list 38, logical volume constitution information is acquired from the means in each allocated logical volume, a logical volume having the lowest I/O load is selected from an allocation candidate volume group, and other logical volumes in the same volume group are excluded from allocation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dividing a large capacity disk into a plurality of logical volumes for use, reducing the influence of I / O access competition in a logical volume group, and improving the I / O throughput. The present invention relates to a volume allocation system and a medium recording a volume allocation program.

When a job is executed by a computer, a data set is created in a disk device by the job, and a volume of the disk device is selected in order to expand the space of the data set. You need to make an assignment. In this case, if a request is made to select an appropriate volume from the volumes prepared in the computer system for use in an arbitrary job and allocate the space for the data set, this is called an unspecified volume request.

The volume selection function of the system selects a volume having a necessary data set space from such selection target volumes. In such a case, the data set space amount and the input / output Any of the loads can be used as a selection criterion. That is, when using the space amount of the data set as the selection criterion, the one with the largest data set space was selected, and when the input / output load was used as the selection criterion, observation was performed by an appropriate method. The volume with the lowest access frequency is selected by referring to the access frequency information for each volume.

[0004] In recent disk drives, RAID technology has been adopted to reduce costs, save space, achieve high-speed access,
A disk array that divides a large-capacity disk into logical volumes has been commercialized to achieve high reliability. In a computer system using this disk array, there is a demand for the development of a volume allocation system and a medium recording a volume allocation program that can optimize volume allocation and improve I / O throughput.

[0005]

2. Description of the Related Art As a conventional computer system, for example, there is one as shown in FIG. In FIG. 13, 10
Reference numeral 1 denotes a host computer, and the host computer 1
Reference numeral 01 denotes input / output control devices 104 and 105 connected via channels 102 and 103. I / O controller 10
5, disk devices 107 and 108 as input / output devices are connected via a path 106, respectively.

A disk array 110 as an input / output device is connected to the input / output control device 104 via a path 109. The disk array 110 includes a plurality of logical volume groups 112 and 113 obtained by dividing a large capacity disk into a plurality of logical volumes 111. 1
Reference numeral 14 denotes an unspecified volume, and an unspecified volume 11
No. 4 is required when selecting a volume and allocating it to the space of the data set. The numbers on the left side in parentheses indicate the assignment order, and the numbers on the right side indicate the average I / O response value, respectively.

The host computer 101 stores a volume allocation program 101A for optimizing volume allocation. FIG. 14 is a diagram showing a configuration example of the volume allocation program 101A. FIG.
, The volume allocation program 101A includes a job management unit 115, an allocation candidate list 116, an allocated list 117, a volume selection unit 118, and a performance information collection unit 119.

[0008] When selecting the unspecified volume 114, the job management unit 115 has two types of allocation, one taking into account the space of the data set and the other taking into consideration the I / O performance.
When considering the O performance, an allocation candidate list 116 and an allocated list 117 are created, and the volume 118 is requested to select a volume. The performance information collection unit 119 collects performance information relating to the number of I / O issuances and the cumulative value of the elapsed I / O time from the input / output device 120, and calculates the average I / O response value for the input / output device 120 for a certain period of time in the volume selection unit. 1
18 is output. The volume selection unit 118 refers to the allocation candidate list 116 and the allocated list 117 passed from the job management unit 115 and refers to the volume with the smallest average I / O response value obtained at regular intervals from the performance information collection unit 119. Select, for example, VOL 6 to select volume 12
The job management unit 115 is notified as “1”. In this case, the volume selection unit 118 adds a fixed I / O response value for each assignment of the unspecified volume 114 so as not to concentrate the assignment to one volume until the next fixed time interval, and adds the I / O response value. The volume having the smallest averaged I / O response value is selected. Job management unit 115
Creates the job steps a, 122 of the jobs 122, 123 by creating the assignment candidate list 116 and the assigned list 115.
The unspecified volume 114 used in b and c is prevented from being concentrated on the specified volume.

FIG. 15 is a flowchart for explaining a conventional volume allocation process. In step S101, the job management unit 115 creates an allocation candidate list 116 from the unspecified volumes 114 used in the job steps a, b, and c of the jobs 122 and 123. For example, VOL1 to VOL10 are set from the unspecified volume 114 in the allocation candidate list 116.

Next, in step S102, the job management unit 1
15 sets only the allocated volume in the allocated list 117. For example, VOL1, V
OL2, VOL3, and VOL4 are sequentially set. next,
In step S103, the volume selection unit 118 refers to the allocation candidate list 116 and the allocated list 117, and obtains an average I / O response value from the performance information collection unit 119 to the input / output device 120 for a certain time at certain time intervals. A certain I / O response value is added for a certain unspecified volume allocation, and a volume having the smallest average I / O response value is selected.

Next, in step S104, the job management unit 1
Numeral 15 performs an allocation process for acquiring space of the volume selected by the volume selection unit 118. In step S105, it is determined whether or not the acquisition of the space has succeeded. If not, the process returns to step S102. In this way, as shown in FIG. 13, the volumes are allocated in the order of (1) to (10), but the addition of the I / O response value is performed only for the selected volume, and volume conflict is avoided. Same logical volume group 11
2 and 113, the I / O access conflict occurs in the logical volume groups 112 and 113.

[0012]

In a conventional volume allocation system, when a large-capacity disk device is divided into a plurality of logical volumes, a plurality of read or write requests are made to the same logical volume group. Occurs, drive contention occurs, and multiple accesses cannot be processed in parallel.

In a social system system (such as a bank account system), business is organized based on certain performances (I / O response, I / O throughput). Therefore, I / O
Deterioration of the response has an effect on business. To avoid this problem, the disk array is equipped with a large amount of cache. However, originally, it is not possible to expect a cache hit. In the large-scale sequential processing that requires, the disk contention cannot be avoided, and business design and volume arrangement for performance assurance are required, which places a heavy burden on the system administrator.

In the conventional assignment logic, the volume selection unit notifies the job management unit of the volume with the minimum I / O response. This I / O response includes the performance of the disk array such as superior performance due to the cache effect or disadvantageous performance due to logical volume contention. Even when an unspecified volume is selected in the disk array, the I / O response is minimal. It is still the same that the volume is determined to be the minimum load volume and selected. However, when selection requests compete for a short period of time, the following problems occur in the conventional volume allocation system.

Since the addition of the I / O response is performed only on the selected volume, in the case of a disk array, the effect on the access performance to the logical volumes in the same group is not considered. -The added value of the I / O response is constant and the difference in access performance of the device is not taken into account, and there is no difference between the non-disk array and the disk array. Used repeatedly.

As described above, in the conventional allocation logic, since a logical volume group is not considered, in a system in which an unspecified volume is arranged in a disk array,
At the time of unspecified volume allocation, even if volume contention is avoided, volumes in the same logical volume are allocated at the same time.
A / O access conflict occurs (see FIG. 13).

The present invention has been made in view of such a conventional problem, and aims at optimizing volume allocation in a computer system having a plurality of logical volume groups having different I / O access performances. It is an object of the present invention to provide a volume allocation system and a medium in which a volume allocation program is recorded, which can improve response of volume access and throughput.

[0018]

In order to achieve this object, the present invention is configured as shown in FIG. A volume allocation system which has a disk array composed of a plurality of logical volume groups obtained by dividing a large-capacity disk into a plurality of logical volumes, and selects and processes a logical volume having the minimum I / O response. A performance information collecting means 40 for collecting performance information from a device including the disk; and generating, updating, and notifying logical volume configuration information constituting a plurality of logical volume groups from the plurality of logical volumes for each assigned logical volume. The I / O configuration information management means 41 and the disk array system after the creation of the allocation candidate list 37,
In the case of a disk array system, the I / O configuration information management means 41 obtains logical volume configuration information for each assigned logical volume by a configuration information acquisition means 36A.
A setting unit 36B for setting another logical volume in the same logical volume group including the allocated volume in the allocated list 38; and the I / O configuration information managing unit 41.
Of logical volume configuration information for each allocated logical volume from the I / O
Volume selection means 39 for selecting a logical volume with the lowest load and excluding another logical volume in the same volume group from the allocation target.

According to a second aspect of the present invention, the performance information collecting means 40 calculates a value obtained by indexing the I / O access performance of the device including the disk as a virtual I / O response value. The invention according to claim 3 is characterized in that the volume selection means 39
Acquires the virtual I / O response value calculated by the performance information collecting means, and assigns the virtual I / O response value to the selected logical volume and other logical volumes in the logical volume group to which the logical volume belongs. to add.

According to a fourth aspect of the present invention, a virtual I / O response value added to a logical volume selected in a disk array is compared with a virtual I / O response value added to a volume selected in a non-disk array. Are different values, and the virtual response values added to other logical volumes in the same logical volume group are also different values. According to a fifth aspect of the present invention, there is provided a disk array comprising a plurality of logical volume groups obtained by dividing a large-capacity disk into a plurality of logical volumes, and a volume for selecting and processing a logical volume having a minimum I / O response. Means 40 for collecting performance information from a device including the disk on a medium on which the allocation program is recorded, and generating logical volume configuration information configuring a plurality of logical volume groups from the plurality of logical volumes for each allocated logical volume; The disk array system is determined after the update / notification unit 41 and the allocation candidate list 37 have been created. If the disk array system is a disk array system, the logical volume configuration information is transmitted from the I / O configuration information management unit 41 to each allocated logical volume. Means 36A for acquiring and an assigned button in the assigned list 38. Means 36B for setting the other logical volumes in the same logical volume group including volume,
The logical volume configuration information is acquired for each allocated logical volume from the I / O configuration information management means 41, and a logical volume with the lowest I / O load is selected from the allocation candidate volume group, and another logical volume having the same I / O load is selected. Means 39 for excluding the logical volume from the allocation targets.

According to a sixth aspect of the present invention, in the medium in which a volume allocation program is recorded, the performance information collecting means 40 converts a value obtained by indexing an I / O access performance of a device including the disk into a virtual I / O It is calculated as a response value. The invention according to claim 7, wherein in the medium in which the volume allocation program is recorded, the volume selecting means 39 acquires the virtual I / O response value calculated by the performance information collecting means 40, and Then, the virtual I / O response value is added to the other logical volumes in the logical volume group to which the logical volume belongs.

According to an eighth aspect of the present invention, in a medium on which a volume allocation program is recorded, a virtual I / O response value added to a volume selected in a non-disk array is added to a logical volume selected in a disk array. Virtual I / O response values to be different,
The virtual response values to be added to other logical volumes in the same logical volume group are also different values.

According to the present invention having such a configuration,
Conventionally, only the allocated volume is excluded from the allocation target. However, in the present invention, the other logical volumes to which the allocated volume belongs are also excluded from the allocation target, so that the same logical volume group 1 to
4 avoids logical volume contention. Also, I / O
In consideration of a case where devices having different access performances are mixed in the same unspecified volume, I / O access performance is indexed, a virtual I / O response value is added and reflected in allocation. Virtual I / O
Since the response value is differentiated, the disk array and the non-disk array are not used equally and redundantly.

Further, since the virtual I / O response value is added to the logical volumes in the same logical volume group other than the allocated volumes, logical volume conflicts in the same logical group are less likely to occur. As a result, the volume allocation can be optimized, so that the response of volume access and the throughput can be improved.

[0025]

FIG. 2 is a block diagram showing an embodiment of the present invention. In FIG. 2, reference numeral 21 denotes a host computer;
2 and 23, and pass 2 through channels 22 and 23
An input / output control device 26 is connected to the host computer 21 by 4 and 25. The host computer 21 stores a volume allocation program 27 to be described later for optimizing the volume allocation.

A disk array 29 as an input / output device is connected to the input / output control device 26 via a path 28. The disk array 29 includes a plurality of logical volume groups 1
To 4. Logical volume group 1
4 to 4 are obtained by dividing a large-capacity disk into a plurality of logical volumes 30. The logical volume 30 is configured to traverse a plurality of data disks 31 to 34 and one parity disk 35. Although not shown, a disk 1 as shown in FIG.
07 and 108 are connected.

FIG. 3 is a diagram showing a configuration example of the volume allocation program 27. 3, a volume allocation program 27 includes a job management unit 36, an allocation candidate list 37, an allocated list 38, a volume selection unit 39 as a volume selection unit, a performance information collection unit 40 as a performance information collection unit, and an I / O. It is configured by an I / O configuration information management unit 41 as configuration information management means.

The job management unit 36 includes a configuration information obtaining unit 36A as configuration information obtaining unit and a setting unit 3 as setting unit.
6B. The configuration information acquisition unit 36A includes the job 42,
After creating an allocation candidate list 37 from the unspecified volumes used in the job steps a, b, and c of 43 and determining that the system is a disk array system, the I / O configuration information management unit 41 sends the logical volume configuration information Get for each assigned volume.

The setting unit 36B sets an assigned volume and another logical volume 30 in the same logical volume group 1 to 4 including the assigned volume in the assigned list 38. The performance information collection unit 40 receives the I / O
The performance information on the number of times of O issue and the accumulated value of the I / O elapsed time is collected and output to the volume selection unit 39. Further, the performance information collecting unit 40 is a virtual I / O response value calculating unit 4.
0A, and the calculating unit 40A calculates a value obtained by indexing the I / O access performance as a virtual I / O response value.

The I / O configuration information management unit 41 stores a plurality of logical volume groups 1 to 3 from a plurality of logical volumes 30.
4 is generated for each assigned logical volume, updated, and notified to the job management unit 36 and the volume selection unit 39. Volume selector 3
Reference numeral 9 denotes an average I / O response value for a certain period of time obtained from the performance information collection unit 40 at certain time intervals, and acquires logical volume configuration information from the I / O configuration information management unit 41 for each allocated logical volume, and allocates the logical volume configuration information. A logical volume with the lowest I / O load is selected from the candidate volume group, and other logical volumes in the same volume group are excluded from allocation targets.

Further, the volume selection section 39 is provided with a virtual I / O
It has an adding unit 39A for adding the O response value. The adding unit 39A acquires the virtual I / O response value calculated by the performance information collecting unit 40, and selects the selected logical volume and the logical volume group to which the logical volume belongs. The virtual I / O response value is added to the other logical volumes in the virtual disk.

In this case, for the virtual I / O response value x added to the selected volume of the non-disk array,
The virtual I / O response value y added to the logical volume selected in the disk array is the same or different, and the virtual response value z added to the other logical volumes 30 in the same logical volume groups 1-4 is also different. Value (small value). For example, x = y = 10, z = 7
Alternatively, x = 10, y = 5, and z = 2.

The job management unit 36 includes the volume selection unit 3
The selected volume 45 selected in step 9 is accepted, and space allocation processing of the selected volume 45 is performed. FIG.
(A) to (C) and FIGS. 5A and 5B show virtual I / Os.
FIG. 9 is an explanatory diagram of assignment of an unspecified volume when a response value is not added. FIG. 4A shows an example of the logical volume configuration information 46 acquired by the volume selection unit 39 from the I / O configuration information management unit 41.

The logical volume configuration information 46 is composed of a plurality of logical volume groups 1 to 4 composed of a plurality of logical volumes 30. 2ms, 3m
.. indicate the I / O response values of the logical volume 30. The volume selection unit 39 refers to the allocation candidate list 37 and the allocated list 38, and selects a volume having the minimum I / O response value for volumes other than the allocated volumes in the allocation candidate list 37.

In FIG. 4A, a VO of 2 ms in which the I / O response value of the logical volume group 1 is the minimum
When L1 is assigned, as shown in FIG.
The other VOL2, VOL3, VOL4 of the logical volume group 1 to which OL1 and VOL1 belong are set as the non-allocation target volume group 47 in the allocated list 38, and the allocation candidate volume group 48 composed of the logical volume groups 2, 3, 4 Is acquired as the logical volume configuration information 46.

Next, in FIG. 4B, when the VOL 9 having the minimum I / O response value of 6 ms is assigned,
As shown in FIG. 4C, the volume group 4 not to be allocated
7 becomes logical volume groups 1 and 3, and allocation candidate volume group 48 becomes logical volume groups 2 and 4. Next, in FIG. 4C, when the VOL 5 having a minimum I / O response value of 10 ms is assigned, FIG.
As shown in (A), the non-allocation target volume group 47
The logical volume groups are 1, 3, and 2, and the allocation candidate volume group 48 is only the logical volume group 4.

In FIG. 5A, a VOL of 15 ms having the minimum I / O response value of the logical volume group 4
When D is allocated, as shown in FIG. 5B, the allocation candidate volume group 47 becomes a logical volume group 1 without VOL1, a logical volume group 2 without VOL5,
The logical volume group 3 has no VOL 9 and the logical volume group 4 has no VOL. The volumes 49 not to be allocated include VOL1, VOL5, VOL9, VOL
Become LD. After that, the logical volume groups 1 to
Logical volume 30 with the smallest I / O response value in 4
Are assigned sequentially. Unassigned volume 49 is 1
There are six logical volumes 30.

FIGS. 6A to 6C and FIGS.
(B) is an explanatory diagram of allocation of an unspecified volume when a virtual response value is added. FIG. 6A shows FIG.
As shown in (A), the volume selection unit 39 performs I / O
The logical volume configuration information 46 acquired from the configuration information management unit 41 is shown. The volume selection unit 39 refers to the allocation candidate list 37 and the allocated list 38 and determines from the logical volume configuration information 46 that the I / O response value is the minimum 2m.
Allocate VOL1 of s.

As shown in FIG. 6B, the logical volume group 1 becomes the non-allocation target volume group 47, and the logical volume groups 2, 3, and 4 become the allocation candidate volume group 48. “10” is added to the allocated VOL1 as a virtual I / O response value.
Other VOL2, V of logical volume group 1 to which
“7” is added to OL3 and VOL4 as a virtual I / O response value.

Virtual I for allocated volume VOL1
VOL2 to VOL4 other than the / O response value "10"
The virtual I / O response value added to is set to a small value as “7”. Next, in FIG. 6C, VOL 9 (6 ms) to which the logical volume group 3 has been assigned.
Is added as a virtual I / O response value to
Other VOLA, VOLB,
“7” is added to VOLC as a virtual I / O response value.

Next, in FIG. 7A, “10” is added as a virtual I / O response value to the assigned VOL 5 (10 ms) of the logical volume group 2, and the other VOL 6 and VOL 7 of the logical volume group 2 are added. , VOL
“7” is added to 8 as a virtual I / O response value. Next, “10” is added as the virtual I / O response value to the VOL (15 ms) of the logical volume group 4 in FIG.
Virtual I / O to other VOL, VOLF, VOL0
“7” is added as the O response value.

As shown in FIG. 7B, the allocation candidate volume group 48 includes a logical volume group 1 without VOL1, a logical volume group 2 without VOL5,
The logical volume group 3 has no VOLC and the logical volume group 4 has no VOL. The volumes 49 not to be allocated include VOL1, VOL5, VOL9,
VOL, and the respective virtual I / O response values “1”
"0" is added. VOL2 to VOL4
VOL6 to VOL8, VOLA to VOLC, VOL
The virtual I / O response value “7” is added to VOL0. Then, the logical volumes 30 with the minimum I / O response values in the logical volume groups 1 to 4 are sequentially allocated again. As a result, the non-allocation target volume 49 becomes 16 logical volumes 30, and the volume allocation process ends.

FIG. 8 is an explanatory diagram for explaining the order of volume assignment. In FIG. 8, a logical volume group 1 has a logical volume 30 divided into four, and the logical volume 30 has an I / O response value of 5 m each.
s, 5 ms, 6 ms, and 11 ms. The logical volume group 2 is a logical volume 3 divided into four.
0, and the I / O response values of the logical volume 30 are 6 ms, 6 ms, 7 ms, and 8 ms, respectively.

Reference numerals 107 and 108 denote non-disk array disks, respectively. Reference numeral 50 denotes an unspecified volume. When the assignment is performed without adding the virtual I / O response value, the assignment order is (1) to (16). I / O access conflicts in the logical volume groups 1 and 2 are less likely to occur. Next, the volume selection unit 3
The virtual I / O response value added in 9 will be described.

For the unspecified volume, there is a possibility that devices having different access performances may be mixed in the allocation candidate group, and there is also a type in which a logical volume is divided. Therefore, the following two items are indexed, and the future I
Predict I / O response values and set allocation criteria. A virtual I / O response value is provided as the index value.・
The access performance differs for each input / output device.

When a logical volume is divided, performance is degraded if contention occurs between volumes. It is originally impossible to predict at the time of assignment. Because at this point I
This is because the amount of / O access is not known. Therefore,
A certain value considering the device access characteristics is added as a virtual I / O response value.

The I / O processing time and the number of issued I / Os are accumulated for each device.
The average I / O response value is calculated, and the virtual I / O
By adding the O response value, an I / O response value in the case of allocation in the future is predicted, and at the time of unspecified volume allocation, a device having the smallest value among non-allocated device groups is selected.

Predicted I / O response value = Average I / O response value for the past 10 seconds + Virtual I / O response value In a disk array, logical volume contention occurs in a logical volume group, causing performance degradation. It is better to employ assignment logic that avoids assignments within groups as much as possible. In this case, the virtual I / O response value may be adopted as follows.

It is assumed that the volume assigned in the non-disk array = x The volume assigned in the disk array = y The non-allocated volume in the logical volume group of the volume assigned in the disk array = z.

If x = y and z <x, the object is achieved. For example, x = y = 10 and z = 7.
On the other hand, if it is desired to make a difference in allocation priority between the disk array and the non-disk array, x>y> z may be satisfied. At this time,
In order to determine x, y, and z, a relative performance value of the disk array with respect to the non-disk array may be obtained.

Generally, I / O access performance (I / O response) is largely determined by the following factors. (1) I / O access characteristics-Sequential access, random access-Read, write (update, create) (2) I / O access amount-Small access, large access (3) Hardware performance-Cache hit performance-Cache miss Performance (4) I / O load and contention factors ・ Device path contention ・ Logical volume contention ・ Channel and controller internal resource contention Cache miss performance is one digit (10 times) or more worse than cache hit performance And a competing factor (device path, logical volume, etc.) amplifies this.

Originally, the performance of the disk array should be calculated statistically. However, this is difficult, so one technique is to assume a hit rate of about 50% (pre-estimation of cache hit or miss). Is not possible.), And a performance value when there is no conflict with the performance value at the time of contention for a logical volume is obtained and calculated from this value. FIG. 9 shows an example of the calculation. In FIG. 9, x = 10, y = 5, and z = 2.

In this way, it is difficult to simultaneously assign the logical volumes 30 in the same logical volume groups 1 to 4. FIG. 10 is a flowchart for explaining the volume allocation processing. First, in step S1, an assignment candidate list 37 is created by the job management unit 36.
That is, the job management unit 36 specifies the unspecified volume 5 used in the job steps a, b, and c of the jobs 42 and 43.
An allocation candidate list 37 is created from 0. For example, VOL1 to VOL10 are set in the allocation candidate list 37.

Next, in step S2, the job management unit 36 determines whether or not the system is a disk array system. If the system is not a disk array system, the flow advances to step S3 to perform conventional processing. That is, only the assigned volumes are set in the assigned list 38, the volume having the smallest I / O response value is selected, and the process proceeds to step S7.

If the system is a disk array system, in step S4, the configuration information acquisition unit 36A of the job management unit 36
I / O configuration information management unit 41 for each assigned volume
More logical volume configuration information is obtained. Next, in step S4, the setting unit 36B of the job management unit 36 uses the allocation candidate list 37 and the acquired logical volume configuration information to set the allocated volume in the allocated list 38 and the logical volume groups 1 to 4 to which the allocated volume belongs. The other logical volume 30 in the server is set. For example, as shown in the assigned list 38 of FIG.
L1 to VOL4 are set.

Next, in step S5, the volume selection unit 3
9 acquires the logical volume configuration information from the I / O configuration information management unit 41 with reference to the allocation candidate list 37 and the allocated list 38, and obtains the performance information from the performance information collection unit 40. Logical volume 3 with minimum I / O response
Select 0. In this case, the virtual I / O response value calculated by the calculation unit 40A of the performance acquisition collection unit 40 is obtained, added to the selected logical volume 30, and the logical volume groups 1 to 4 to which the selected logical volume 30 belongs. The virtual I / O response value is also added to the other logical volumes 30 within the group.

As the virtual I / O response value to be added, for example, the assigned volume of the non-disk array is 1
0, the allocated volume of the disk array is 10, and the other unallocated volume to which the allocated volume of the disk array belongs is 7. In addition, when making a difference in allocation priority between a disk array and a non-disk array, for example, a virtual I
As the / O response value, it is assumed that the allocated volume of the non-disk array is 10, the allocated volume of the disk array is 5, and the other non-allocated volume to which the allocated volume of the disk array belongs is 2.

Here, a description will be given of the allocation processing in the case where the virtual I / O response value is not added in the volume selection processing with the minimum I / O response value in step S6.
FIG. 15 is a flowchart illustrating an assignment process when a virtual I / O response value is not added. 11, first, in step S21, referring to the logical volume configuration information 46 shown in FIG. 4A, the logical volumes 3 of the logical volume groups 1-4 satisfying the required space amount.
VOL1 as the volume with the lowest I / O load from 0
Assign.

As shown in FIG. 4B, VOL1 and VOL1
Other VOL2 of logical volume group 1 to which
VOL3 and VOL4 are volume groups 47 not to be allocated.
Are set in the assigned list 38, and as the next logical volume configuration information 46, the logical volume group 2,
An allocation candidate volume group 48 composed of 3 and 4 is acquired.

Next, in step S22, VOL 9 is allocated as the volume with the lowest I / O load from the allocation candidate volume group 48 in FIG. 4B. FIG. 4 (C)
As shown in (1), the non-allocation target volume group 47 becomes logical volume groups 1 and 3, and the allocation candidate volume group 48 becomes logical volume groups 2 and 4. next,
In step S23, the allocated volume group 48 of FIG.
VO as the volume with the lowest I / O load
Assign L5. As shown in FIG. 5A, the non-allocation target volume group 47 includes a logical volume group 1,
2, 3 and the allocation candidate volume group 48 becomes the logical volume group 4.

Next, in step S24, VOL is allocated as the volume with the lowest I / O load from the remaining allocation candidate volume group 48 in FIG. 5A. FIG.
As shown in (B), the non-allocation target volume 49
OL1, VOL5, VOL9, and VOL, and the allocation candidate volume group 48 is a logical volume group 1 without VOL1, a logical volume group 2 without VOL5, a logical volume group 3 without VOL9, and VOL.
The logical volume group 4 without D is obtained. Next, in step S25, if all the logical volumes 30 in the logical volume groups 1 to 4 have already been allocated in the job step in question, only the logical volumes 30 actually allocated are excluded from the allocation targets, and the logical volume group is re-allocated. The logical volumes 30 having the minimum I / O response value in the areas 1 to 4 are sequentially allocated.

In this way, 16 logical volumes 30 are finally obtained as the volumes 49 not to be allocated. As described above, conventionally, only the allocated volume is excluded from the allocation target. However, in the present embodiment, the other logical volumes 30 of the same logical volume group 1 to 4 are excluded from the allocation target, so that the logical volume group is excluded. To avoid I / O access contention within the network.

FIG. 12 is a flowchart for explaining volume allocation when the virtual I / O response value is added. In FIG. 12, first, in step S31, FIG.
Referring to the logical volume configuration information 46 shown in FIG.
Logical volume groups 1-4 that satisfy the required space amount
VOL1 is assigned as the volume with the lowest I / O load from the logical volume 30 of VOL1. Then, the assigned VOL1 and the other VOL2 of the logical volume group 1
The virtual I / O response value is added to VOL4. For example, as the virtual I / O response value, VOL1
10ms, VOL2, VOL3, VOL4 7m
Add s.

As shown in FIG. 6B, VOL1 to VOL
The logical volume group 1 composed of L4 is set as the non-allocation target volume group 47 in the allocated list 38, and the allocation candidate volume group 48 composed of the logical volume groups 2, 3, and 4 is acquired as the logical volume configuration information 46. Next, in step S32, VOL 9 is allocated as the volume with the lowest I / O load from the allocation candidate volume group 48 in FIG. 6B. Then, the virtual I / O is assigned to the assigned VOL 9 and the other VOLA, VOLB, and VOLC of the logical volume group 3.
Add the O response value. For example, as a virtual I / O response value, VOL9 is 10 ms, VOLA, VOL
7 ms is added to B and VOLC.

As shown in FIG. 6C, the non-assignment target group group 47 becomes the logical volume groups 1 and 3,
The allocation candidate volume group 48 becomes the logical volume groups 2 and 4. Next, in step S33, VOL5 is allocated as the volume with the lowest I / O load from the allocation candidate volume group 48 in FIG. Then, the assigned VOL5 and another VOL of the logical volume group 2
6, a virtual I / O response value is added to VOL7 and VOL8. For example, as a virtual I / O response value, VOL5 is 10 ms, VOL6, VOL7, VOL
7 ms is added to L8.

As shown in FIG. 7A, the non-allocation target group group 47 becomes logical volume groups 1, 2, 3, and the allocation candidate volume group 48 becomes logical volume group 4. Next, in step S34, VOL is allocated as the volume with the lowest I / O load from the remaining allocation candidate volume group 48 in FIG.
Then, the virtual I / O response value is added to the allocated VOL and the other VOL, VOLF, and VOL0 of the logical volume group 4. For example, as a virtual I / O response value, VOL has 10 ms, VOL, V
7 ms is added to OLF and VOL0.

As shown in FIG. 7B, the volumes 49 not to be allocated are VOL1, VOL5, VOL9, VOL.
D, the allocation candidate volume group 48 is a logical volume group 1 without VOL1, a logical volume group 2 without VOL5, a logical volume group 3 without VOL9, and a logical volume group 4 without VOL1.

Next, in step S35, when the logical volumes 30 of the logical volume groups 1 to 4 have already been allocated in the job step, only the logical volumes 30 actually allocated are excluded from the allocation targets, and the logical The logical volumes 30 with the minimum I / O response values in the volume groups 1 to 4 are sequentially allocated. As a result, the non-allocation target volume 49 becomes 16 logical volumes 30.

Returning again to FIG. 10, in step S7, space request allocation processing for the selected volume is performed, and in step S8, it is determined whether or not space acquisition has succeeded.
If not successful, the process returns to step S2, where the next volume allocation is performed, the space acquisition succeeds, and the process ends when 16 volumes are allocated, for example. Conventionally, only the allocated volume is excluded from the allocation target, but in the present embodiment, the other logical volumes 30 to which the allocated volume belongs are excluded from the allocation target, so that the same logical volume group 1 is excluded. 4 can avoid logical volume conflicts.

The numbers (1) to (16) in FIG. 8 indicate the allocation order, and I / O access contention hardly occurs in the logical volume groups 1 and 2. In consideration of a case where devices having different access performances are mixed in the same unspecified volume, the I / O access performance is indexed, a virtual I / O response value is added, and the result is reflected in the allocation. In the array, since the virtual I / O response value is differentiated, the disk array and the non-disk array are not equally used.

Further, the same logical volume groups 1 to 4
The virtual I / O response value is also added to the logical volumes 30 in the same logical volume groups 1 to 4 other than the allocated volumes in order to make it difficult to allocate the logical volumes 30 in the same logical volume at the same time. As described above, the volume allocation can be optimized, so that the response of the volume access and the throughput can be improved.

In order to obtain the configuration information of the device relating to the I / O access performance such as the presence / absence of logical volume division and the chassis structure (whether or not the device is under the same device adapter), when the device is added or deleted halfway, Can be easily reflected.

[0073]

As described above, according to the present invention, the volume allocation can be optimized, so that the response of volume access and the throughput can be improved.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing a configuration example of a volume allocation program;

FIG. 4 is an explanatory diagram of volume allocation without adding a virtual I / O response value (part 1)

FIG. 5 is an explanatory diagram of volume allocation without adding a virtual I / O response value (part 2)

FIG. 6 is an explanatory diagram (part 1) of volume allocation to which a virtual I / O response value is added

FIG. 7 is an explanatory diagram (part 2) of the volume allocation to which the virtual I / O response value is added

FIG. 8 is an explanatory diagram of an assignment order.

FIG. 9 illustrates an example of a virtual I / O response value.

FIG. 10 is a flowchart illustrating processing of volume allocation.

FIG. 11 is a flowchart for explaining minimum volume selection when a virtual I / O response value is not added;

FIG. 12 is a flowchart for explaining a minimum volume selection when a virtual I / O response value is added;

FIG. 13 is a block diagram showing a conventional example.

FIG. 14 shows a conventional volume allocation program.

FIG. 15 is a flowchart illustrating conventional volume allocation.

[Explanation of symbols]

1-4: Logical volume group 21: Host computer 22, 23: Channel 24, 25, 28: Path 26: I / O controller 27: Volume allocation program 29: Disk array 30: Logical volume 31-34: Data disk 35: Parity disk 36: Job management unit 36A: Configuration information acquisition unit (configuration information acquisition unit) 36B: Setting unit (setting unit) 37: Allocation candidate list 38: Allocation list 39: Volume selection unit 39A: Addition unit 40: Performance information Collection unit (performance information collection unit) 40A: calculation unit 41: I / O configuration information management unit (I / O configuration information management unit) 42, 43: job 44: input / output device 45: selected volume 46: logical volume configuration information 47: non-allocation target volume group 48: allocation candidate volume group 49: Against non-target volume 50: unspecified volume

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Masanobu Suzuki 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Toshio Fukui 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Fujitsu Co., Ltd. (72) Inventor Hiroaki Yamamoto 4-1-1 Kamidadanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture 1 Fujitsu Co., Ltd. No. 1 Inside Fujitsu Limited

Claims (8)

[Claims] 1. A volume allocation system which has a disk array composed of a plurality of logical volume groups obtained by dividing a large-capacity disk into a plurality of logical volumes, and selects and processes a logical volume with a minimum I / O response. A performance information collection unit that collects performance information from an apparatus including the disk; and an I / O that generates, updates, and notifies logical volume configuration information that configures a plurality of logical volume groups from the plurality of logical volumes for each assigned logical volume. O configuration information management means, and configuration information for obtaining a logical volume configuration information for each allocated logical volume from the I / O configuration information management means when the disk array system is determined and the disk array system is determined after the allocation candidate list is created. Acquisition method, including the allocated volume in the allocated list Setting means for setting another logical volume in the same logical volume group; and acquiring logical volume configuration information from the I / O configuration information management means for each allocated logical volume, A volume selection unit that selects a logical volume with the lowest I / O load and excludes other logical volumes in the same volume group from allocation targets. 2. The volume allocation system according to claim 1, wherein said performance information collecting means is an I / O of a device including said disk.
A volume allocation system for calculating a value obtained by indexing / O access performance as a virtual I / O response value. 3. The volume allocation system according to claim 1, wherein said volume selection means acquires a virtual I / O response value calculated by said performance information collection means, and selects a selected logical volume and said logical volume. I / O to other logical volumes in the logical volume group to which the
A volume allocation system characterized by adding a response value. 4. The volume allocation system according to claim 3, wherein a virtual I / O response value added to a volume selected in the non-disk array is added to a logical volume selected in the disk array. A volume allocation system wherein I / O response values are different values, and virtual response values added to other logical volumes in the same logical volume group are also different values. 5. A volume allocation program for selecting a logical volume having a minimum I / O response, comprising a disk array composed of a plurality of logical volume groups obtained by dividing a large-capacity disk into a plurality of logical volumes. Means for collecting performance information from a device including the disk, and generating, updating, and notifying logical volume configuration information configuring a plurality of logical volume groups from the plurality of logical volumes for each assigned logical volume. Means for determining a disk array system after creating an allocation candidate list, and, if the system is a disk array system, obtaining logical volume configuration information for each allocated logical volume from the I / O configuration information management means; Logical volumes that include assigned volumes in the list Means for setting another logical volume in the system group; and acquiring logical volume configuration information from the I / O configuration information management means for each assigned logical volume, and setting the I / O load from the allocation candidate volume group. Means for selecting the lowest logical volume and excluding other logical volumes in the same volume group from the allocation targets. 6. A medium in which the volume allocation program according to claim 5 is recorded, wherein the means for collecting the performance information is a virtual I / O response which is a value obtained by indexing an I / O access performance of a device including the disk. A medium in which a volume allocation program recorded as a value is recorded. 7. A medium recording the volume allocation program according to claim 5, wherein the means for selecting the volume acquires a virtual I / O response value calculated by the means for collecting the performance information,
A medium recording a volume allocation program, wherein a virtual I / O response value is added to a selected logical volume and another logical volume in a logical volume group to which the logical volume belongs. 8. A medium in which a volume allocation program according to claim 7 is recorded, wherein a virtual I / O response value added to a volume selected in a non-disk array is added to a logical volume selected in a disk array. A medium in which a volume allocation program is recorded, wherein different virtual I / O response values are used and different virtual response values are added to other logical volumes in the same logical volume group.