JP2002236560A - Computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand areas of individual logical volumes while continuously using the logical volumes and to integrate parted logical volumes in one continuous area. SOLUTION: A storage is equipped with a logical volume control means which performs constitution control over logical volumes, a logical volume number map wherein constitution information of the logical volumes is described, and a copying means which copies the logical volumes. In the logical volume number, more than two internal logical numbers are allowed to be described for one external logical number and then the degree of freedom of the connection of the logical volumes in the storage is increased. Further, parted logical volumes are copied by the copying means to a physical continuous area to integrate the logical volumes into one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for changing the configuration of a logical volume area in a storage device.
In particular, it relates to a method for expanding a logical volume area.

[0002]

2. Description of the Related Art Conventionally, as a method of expanding the capacity in a storage device, an expansion method by adding a physical disk is known. This will be described with reference to FIG. Reference numeral 100 denotes a storage device, and 101 denotes a physical disk area including a set of physical disks. The physical disk area 101 has an LU
A logical volume called (Logical Unit) is configured. 1011x (1011a, 1011b) is a logical volume. When it is desired to expand the capacity of the storage, by adding a physical disk to the storage 100, an additional disk area 102 is created as shown by a broken line. Logical volume LU1 of physical disk area 101
(1011a), when the LU2 (1011b) is full, a new logical volume LU3 (1011c) can be created in the additional disk area 102.

[0003] However, a problem arises when the allocation of the internal logical volume area that has already been allocated is expanded to increase the available storage capacity irrespective of the addition of physical disks. For example, in FIG.
When the area of (1011a) is to be expanded, the area of LU2 (1011b) is continuously located immediately behind the area.
To extend the area of U1 (1011a), LU2
The area of (1011b) must be released by an amount corresponding to the area to be extended. Also, the storage device 1
In order to expand the logical volume area in 00, it is necessary to release the area once and redefine the distribution of the logical volume area, so that access to the logical volume must be interrupted.

[0004]

As described above, it is easy to expand the capacity of the logical volume area by adding physical disks even during the operation of the system. on the other hand,
Since the logical volume is configured as an internal continuous area, it is not possible to expand the area for each logical volume during system operation without adding a physical disk. In other words, in order to expand the logical volume area in the storage device, it is necessary to release the area and redefine a new logical volume area, so that the logical volume area cannot be changed during system operation. is there.

It is an object of the present invention to provide a configuration of a logical volume such as expansion of a logical volume area inside a storage device.
It is possible to make changes freely during the operation of the system. That is, it is an object of the present invention to provide a method for expanding a logical volume area without releasing an existing logical volume area, and expanding the logical volume area without interrupting access to the existing logical volume.

[0006]

A computer system to which the present invention can be applied to obtain an effect is constructed from, for example, one or more computers, a storage, and a management utility for instructing a change in the logical volume configuration of the storage. Is done.

According to the present invention, the storage includes a logical volume control unit for controlling the configuration of a logical volume, and the logical volume control unit includes a logical volume number map for describing configuration information of the logical volume.
The configuration of the computer and the logical volume is described in the logical volume number map, and the combination of the computer and the logical volume in the storage that can be used by the computer is described, so that the configuration of the logical volume can be freely changed. Further, the logical volume divided into a plurality is copied to a physical continuous area and integrated into one logical volume, thereby facilitating the management of the logical volume.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

FIG. 1 is a configuration diagram of a computer system according to a first embodiment. In the figure, 2x (2a, 2
b,..., 2n) are computers, 1 is storage shared by all computers 2x, 4 is a management console for managing the computer system, 3 is all computers 2x, storage 1, and management console 4 mutually. The fiber channel connecting means 5x (5a, 5b,..., 5n) to be connected is a fiber channel. 6x (6a, 6b, ---, 6
n) is a LAN (Local Area Network) for communication between the plurality of computers 2x and the management console 4. Reference numeral 7 denotes a communication unit for communicating between the storage 1 and the management console 4.

In each computer 2x, 21x (21a, 21a,
21b,..., 21n) is logical volume management software, which is called a file system FS or LVM in general. 211x (211a, 211b, ---, 211n)
Is a logical volume recognizing means for recognizing the logical volume configuration of the storage 1 and notifying the configuration change to the logical volume management software 21x. Here, the logical volume is a virtual volume provided in the storage 1, and is a protocol which is one protocol of an interface connecting the computer 2x and the storage 1.
(Small Computer System Interface). Hereinafter, a logical volume may be simply referred to as an LU (Logical Unit). A number for identifying an LU is referred to as a logical volume number (LU).
N: Logical Unit Number).

In the management console 4, reference numeral 41 denotes a management utility, which is used for displaying the LU configuration inside the storage 1, and for setting the LU of the storage 1 by the system administrator. Here is the management utility 4
Although 1 is arranged on the management console 4, it may be arranged on the computer 2 x or the storage 1.

In the storage 1, a logical volume control means 11 controls a logical volume configuration in the storage 1, and notifies logical volume configuration information in response to a request from the logical volume recognition means 211x of each computer 2x. 111 is a logical volume number map (LUN)
Map), and as a component of the LU control means 11,
4 is a map showing a logical correspondence between a logical volume of the storage 1 and a logical volume recognizable from the computer 2x. Reference numeral 12 denotes a physical disk area, which is composed of a set of physical disks. In the physical disk area 12, a logical volume 121x (121a, 121b,
---, 121n).

The logical volume LU will be described. L
U is the host computer 2x (2a, 2b,-
-, 2n) as a logical volume.
The host computer recognizes one LU as one logical disk device. The storage 1 can define and configure a plurality of LUs inside. This is called an internal logical volume (internal LU). In the storage 1, serial numbers are assigned with integers starting from 0 to manage internal LUs. This number is used as the internal logical volume number (internal L
UN).

Generally, a computer searches for a storage connected at the time of OS boot to detect an LU. However, there are some restrictions on the search method. (A) The logical volume number LUN is searched in order from 0. (B) Assuming that the logical volume number LUN exists as a continuous number, and if a certain number does not exist, the subsequent search is not performed. 2 points. This is a device for shortening the search time.

It is assumed that the computer of the present invention is also a computer 2x having such characteristics. In such a case, if the internal logical volume number LUN is assigned to the host computer as it is, a computer assigned a number other than the internal LUN = 0 cannot detect this LU. In other words, since it is assumed that the logical volume number LUN used by any computer starts from 0, if the internal logical volume number is directly allocated as the logical volume number LUN, a number other than the internal LUN = 0 is allocated. From the point of view of the computer, the logical volume LU is not allocated. Therefore, it is necessary that the logical volume numbers as viewed from the computers start from 0 and that the LUNs are assigned by consecutive numbers to all the computers.

Therefore, in the present invention, the storage 1
Is the internal L used by each computer 2x for each computer 2x
The above-mentioned problem is solved by redefining U as a continuous logical volume number starting from 0 when viewed from a computer. Thus, L recognized from each computer 2x
U is called an external logical volume (external LU), and its number is called an external logical volume number (external LUN), and is distinguished from an internal LU and an internal LUN. In the present invention, LUN connection information that defines the relationship between the external LU and the internal LU is provided, and the configuration of the connection between the external LU and the internal LU can be changed based on the LUN connection information. These external LUNs,
The correspondence between the LUN combination information and the internal LUN is managed by a LUN map 111 provided in the storage 1.

The LUN map 111 of the storage 1
2 is shown in FIG. The LUN map 111 stores a port number, a Target ID, an external LUN, LUN connection information, an internal LUN, WWN, S_ID, and an attribute. Hereinafter, these will be described.

The port number stores the number of the fiber channel connection port provided in the storage 1. In the present embodiment, the number of ports is assumed to be one, and 0 is stored uniformly.

The Target ID is an identification ID assigned to the storage 1 at the connection interface between the computer 2x and the storage 1. When the connection interface between the computer 2x and the storage 1 is Fiber Channel as in this embodiment, only one D is provided for each port.
Although a _ID (Destination ID) is provided, it may be omitted because there is a port number term, or the D_ID determined at the time of initialization of the fiber channel connection port may be stored. In the case of SCSI, a plurality of IDs can be provided in the same port.
rget ID is stored. In this embodiment, since a fiber channel is assumed, the Target ID column is not used, and 0 is uniformly stored.

External LUN, LUN connection information and internal L
The UN indicates the correspondence between the LUNs. First,
The physical disk of storage 1 has an internal LUN of 0 to n-
The logical volume area is set to 1 and the logical volume area is set to k for the internal LUN.
For the former area, 0 is assigned as the external LUN, and for the latter area, 1 is assigned as the external LUN. LUN binding information is external LUN
Indicating the connection relationship between the internal LU and the internal LUN, the total number of internal LUs allocated to the external LU is displayed on the left side, the order of the allocated internal LUs is displayed on the right side, and both are connected by a hyphen. Indicates a binding relationship.

The head LBA indicates which address in the external LU is assigned to the head address of each internal LU when viewed from the computer 2x. The LBA (logical block address) is an address in the LU, and the computer 2x accesses data in the LU using this address. When a certain external LU is composed of one internal LU, 0 is assigned to the first LBA.
In the case where the configuration is made up of a plurality of internal LUs due to a change in the LU configuration, the head LBA is rewritten. This point will be specifically described when a modification example of the LU configuration is described.

The number of blocks indicates the number of logical blocks of each internal LU, so that the size of each internal LU can be known.

The WWN stores a World Wide Name which is information for specifying each computer 2x. At the time of port login processing for establishing a connection relationship between fiber channel connection ports, the WWN of each computer 2x is notified to the storage 1.

S_ID is ID information stored in the frame header of the fiber channel, and is an ID for identifying the source (initiator) that created the frame. S_
The ID is dynamically assigned at the time of initialization of the fiber channel. The WWN described above is a value uniquely set by the connection port of each fiber channel exchanged at the time of initialization, but by associating the WWN with the S_ID, it is not necessary to check the WWN for each frame. The computer 2x can be specified by checking only the S_ID.

The attribute indicates the possession attribute of each LU. "Dedicated" indicates that the LU is dedicated to one computer 2x.
“Shared” indicates that the LU is shared by a plurality of computers 2x.

Looking at the LUN map 111 shown in FIG.
Each of the computers 2a to 2n has an internal LUN of 0 to n
It can be seen that each dedicated internal LU of -1 has been assigned. Further, even though these internal LUNs are serial numbers, the external LUNs are all set to 0. Further, it can be seen that an area where the internal LUN is k is set for the shared LU. For this internal LU,
The external LUN is set to 1. Therefore, when searching the storage at the time of booting the OS, each computer can first find out the external LU0 and then find out the internal LU that can be used by searching for 1.

Next, the configuration change of the logical volume LU will be described with reference to the flowchart of FIG.

An operator operating the management console 4 sends an LU configuration change instruction from the management utility 41.
When extending an LU, an internal LUN to be extended and an internal LUN to be newly combined are specified. This instruction is issued to the storage 1 by the communication means 7 (step 70).
1).

The LU control means 11 of the storage 1 receives this instruction, and determines whether or not the specified LU is correct (Step 702). If the specified internal LU is not correct, for example, if a non-existent LUN is specified or an internal LU to be newly joined is allocated to another computer 2x, the LU control means 11 sends the management utility 41 Return an error and end (step 70)
8). If the designated LU is correct, the LU control means 11
Rewrites the LUN map 111 according to the instruction (step 703).

Next, the LU recognition means 211x of the computer 2x
That the LU configuration has been changed. This notification method includes a method in which the LU control means 11 transmits the LU to the LU recognition means 211x via the fiber channel 5x, and a method in which the storage 1
The LU control means 11 notifies the management utility 41, the management utility 41 notifies the LU recognition means 211x of the computer 2x via the LAN 6x, and the administrator directly operates the computer 2x and notifies the LU recognition means 211x. There is a method, and any method can be used (step 704).

The LU recognizing means 211x is provided by the LU control means 1
Obtain the changed LU size from 1. LU recognition means 2
11x, the LU control means 11
May be required to present the configuration information. In this case, the notification of the configuration change (Step 704) can be omitted (Step 705). The LU recognizing unit 211x determines the changed LUN and its size by using the logical volume management software 21x (FS or LVM).
And the changed LU can be used on the computer 2x (step 706).

As described above, the configuration change can be reflected while continuing the online access of the existing LU.

Next, a specific example of a change in the LU configuration will be described.
The rewriting of the LUN map 111 will be described in detail. As an example of changing the LU configuration, consider a case where the LU0 area of the computer 2a is extended. FIG. 4 shows the physical disk area 12
Shows the state of the internal LU. 120x (120a-120
c) is an internal LU. LU in the physical disk area 12
0 area 120a, LU1 area 120b, LU2 area 12
0c are continuously formed. Now, for simplicity, the LU0 area 120a is allocated to the computer 2a, the LU1 area 120b is allocated to the computer 2b, and the LU2 area 120c is an internal LU not allocated to any computer. And In this example,
Even if the LU2 area 120c is an internal LU that is not assigned to any computer, the LU1 area 120b is continuously formed after the LU0 area 120a.
The 0 region 120a cannot be physically extended. In this state, the computer 2a has the LU0 area 120a
Is seen as its own logical volume, and the computer 2b
Shows the LU1 area 120b as its own logical volume.

FIG. 5 shows the LUN map 111 at this time. An internal LUN0 area is allocated to the computer 2a (WWNa), and an internal LUN1 area is allocated to the computer 2b (WWNb), and the internal LUN2 area is free (each item is undefined). Here, when there is a request to extend the LU of the computer 2a, the LU control means 11 sets the internal LU2 120c to the internal LU of the computer 2a based on the configuration change instruction from the management utility 41, as described in FIG. The LUN map 111 is rewritten as described above. FIG. 6A shows the LUN map 111 thus rewritten.
As can be seen, the computer 2a can recognize the internal LUNs 0 and 2 as LUs that can be used by itself. Since the internal LUN 2 is used continuously to the internal LUN 0, the internal LUN 2 starts with the number of blocks of the first LBA of the internal LUN 2. This processing is performed by the LU control means 1
1 is performed. In response to this processing, WWN, S
_ID and the like are also stored corresponding to the computer 2a. When accessing the LU from the computer 2a, it is possible to know whether to access the internal LU0 or the internal LU2 by the head LBA.

FIG. 7 is a diagram for explaining the state of the internal LU of the physical disk area 12 thus rewritten.
As is clear in comparison with FIG. 4, the internal LU 120x (1
20a-120c) are continuously formed, but an area 122 surrounded by a dashed line functions as an LU of the computer 2a. In this state, the computer 2a has the LU0 area 120a and the LU2 area 1
20c is seen as one logical volume that can be used by itself, and the computer 2b
The U1 area 120b appears as its own logical volume.

FIGS. 6B and 6C show the LUN map 111 of another example after the LU configuration is changed.
FIG. 6B shows a state in which an internal LU 5 has been added to the above-described computer 2a in addition to the addition of the logical volume in which the internal LU 2 has been added to the internal LU 0. On the other hand, FIG.
(C) shows the addition of a logical volume in which the internal LU5 is added to the internal LU0 to the computer 2a,
2 shows a state where 2 is added. That is, FIG.
(C) shows an example in which the order of adding internal LUNs is different. The difference in this order is not particularly significant from the viewpoint of the computer 2a.
6B and 6C, the logical volume configuration having the total number of blocks of three internal LUs, as long as the information such as the WWN and S_ID accompanying the BA and the configuration change is properly stored. Can be used for performing its own calculator functions.

As described above, by virtually managing the LU area, it is possible to change the configuration such as expansion of the LU which is physically impossible.

According to this embodiment, there is an effect that the configuration of the logical volume area inside the storage device can be freely changed. Further, according to the present embodiment, there is an effect that the logical volume area can be expanded while continuing to access the existing logical volume. Further, according to the present embodiment, since the configuration can be changed inside the storage device, there is an effect that the logical volume area can be expanded independently of the OS of the computer.

(Embodiment 2) FIG. 8 is a configuration diagram of a computer system of this embodiment. The only difference of the configuration of the computer system from the first embodiment is that a copy unit 13 is added to the storage 1, and the other components are the same. The copy unit 13 is a unit that copies a certain LU to another area.

The LU configuration change will be described with reference to the flowchart of FIG. An operator operating the management console 4 sends an LU configuration change instruction from the management utility 41. When extending an LU, the internal LUN to be extended
And the size to be extended. This instruction is issued to the storage 1 by the communication means 7 (step 80).
1).

The LU control means 11 of the storage 1 receives this instruction, and determines whether or not the total size including the size of the designated internal LU and the size of the expansion can be secured from the free area (step 802).

If the area cannot be secured, the LU control means 1
1 notifies an error to the management utility 41 and ends (step 809).

If the area can be secured, the LU control means 11 secures the area and sends a copy instruction to the copy means 13 (step 803). Copying means 1 receiving a copy instruction
No. 3 copies the designated LU. When the LU copy is completed, the copy unit 13 notifies the LU control unit 11 of the completion of the copy (step 804).

Upon receiving the copy end notification, the LU control means 11 rewrites the LUN map 111, and the newly created L
U is assigned to the computer 2x (step 805).

The processing after step 806 is the same as in the first embodiment.

The change of the LU configuration will be specifically described. Figure 1
0 is a diagram for explaining an example of a configuration change in this embodiment. FIG.
(A) shows the state of the internal LU before the change. Similar to the case described with reference to FIG. 4, consider a case where the LU0 area of the computer 2a is extended. LU0 area 120 in physical disk area 12
a, the LU1 area 120b is configured continuously, the LU0 area 120a is allocated to the computer 2a, and the LU1 area 1
20b is assigned to the computer 2b. In this example, it is assumed that areas other than these areas are free areas. In this example, even if there is sufficient free space, L
Since the LU1 area 120b is continuously formed after the U0 area 120a, the LU0 area 120a cannot be physically extended. At this time, it is the same as in the first embodiment that the computer 2a sees the LU0 area 120a as its own logical volume and the computer 2b sees the LU1 area 120b as its own logical volume. .

First, the copy related to the extension of the LU will be described. From an operator operating the management console 4, an internal LUN to be extended through the management utility 41,
When the LU configuration change instruction is sent to the LU control means 11 by specifying the size to be expanded, the LU control means 11 calculates the total size of the area size of the internal LUN to be expanded from the free area 123 and the area size of the expansion. The area of the new LU2 is secured as an internal LUN. If space cannot be allocated,
Notify the management utility as an error. Then L
The U control means 11 instructs the copy means 13 to copy the contents of the LU0 120a from the head position of the secured area LU2 120d. FIG. 10B shows the copy unit 1.
FIG. 3 is a diagram for explaining a state of copying by No. 3. Area LU2
As indicated by the broken line at 120d, copying is performed from LU0 120a to LU2 120d. LU0 12
When all the contents of 0a have been copied to the LU2 120d, the copy unit 13 notifies the LU control unit 11 of the end of the copy. FIG. 10C shows a state of the internal LU after the copy is completed. LU control means 11 receiving a copy end notification
Rewrites the LUN map 111 to LU2 120d
Is assigned to the computer 2a. LU0 120a is undefined.

FIG. 11 shows a LUN map before updating, and FIG. 12 shows a LUN map after updating. In the pre-update LUN map, the computer 2a is assigned to the internal LUN 0, but in the post-update LUN map, the computer 2a is allocated to the internal LUN 2.
It can be seen that a is assigned. In addition, the number of blocks of the internal LUN 2 is increased from the initial number of blocks. That is, it can be seen that the expansion of the area is realized by the new area. By using the copying means in this way, it is possible to create a new internal LU while continuing the data in the original LU as it is, and to make configuration changes such as LU expansion.

By the way, there is a case where the computer accesses the LU during the copy for changing the LU area. In this case, if this access is a read, the original LU
What is necessary is just to read from an area. If the access is a write access, data may not match unless both the original LU area and the new LU area of the corresponding address are written. There is no problem if this writing access is to the original LU area where the copying means 13 has not yet completed copying. However, if the original LU area has already been copied, even if the data at that address is updated, this new data will not be read and copied to the new LU area. When the copy end is notified in step 804, data mismatch occurs. If there is a possibility that such data inconsistency may occur, the LU control means 11 writes data to both addresses from step 802 to step 805. Of course, the address of the new area may be notified to the computer, and the computer may write to both addresses.

As described above, by copying the contents of the existing LU to the newly secured area, the LU area can be expanded while utilizing the existing data. Also, 1
Since one internal LU is assigned to one external LU, management becomes easy. According to this embodiment, the same effect as in the first embodiment is obtained, and the logical volume area is allocated to the physical continuous area, so that the management of the logical volume becomes easy.

(Embodiment 3) Embodiment 3 will be described. The computer system of this embodiment is the same as that of the second embodiment. This embodiment is realized by a combination of the virtual combination of the logical volumes in the first embodiment and the expansion by the copy unit in the second embodiment.

The LU configuration change will be described with reference to the flowchart of FIG.

An operator operating the management console 4 sends an LU configuration change instruction from the management utility 41.
When extending an LU, all internal LUNs allocated to the external LU to be extended and the size to be extended are specified. This instruction is issued to the storage 1 by the communication means 7 (step 901).

The LU control means 11 of the storage 1 receives this instruction, and determines whether or not the total size including the size of all designated internal LUs and the size of the expansion can be secured from the free area (step 902). .

If the area can be secured, all designated LUs are copied using the copy means, and a new internal LU is created. Also at this stage, measures are taken to avoid the data mismatch described in the second embodiment. Subsequent processing is the same as in the second embodiment. (Step 903) If all the total sizes cannot be secured from the free area, the LU control means 11 determines whether or not virtual combination is possible. If an area corresponding to the extension size can be secured, virtual combination is possible (step 904).

If virtual combining is possible, the secured area of the expanded size is virtually combined with the LU to be expanded (step 905). Subsequent processing is the same as in the first embodiment.

If virtual connection is not possible, the LU control means 11 returns an error to the management utility 41 and terminates (step 906).

An example of an LU configuration change result according to the third embodiment will be described with reference to FIG. 12 is a physical disk area, 1
20x (120e-120h) is an internal LU. Figure 1
FIG. 4A shows a state in which the virtual LUs are virtually combined and the external LU 122 is configured according to the first embodiment, similarly to FIG. In this state, although the external LU 122 appears to the computer as one LU, it can be seen that the internal LU0 120e and the internal LU2 120g are separated inside the storage. FIG. 14B shows the second embodiment.
New internal LU31 with an area to be extended as in
20h shows the configured state. Internal L which was divided
U0 120e and internal LU2 120g are copied to a physical continuous area and integrated as one internal LU. In any case, the LUN map 111 is updated to the corresponding contents.

As described above, the configuration of the logical volume can be changed more flexibly by combining the virtual combination of the logical volumes in the first embodiment and the expansion by the copying means in the second embodiment. In particular, LU divided into multiple
Can be collected in a physical continuous area and can be integrated into one LU, so that the management of internal LUs becomes easy.

As can be understood from the description of the embodiment, in the logical volume number map 111 of the present invention, as in the embodiment, a port number, a Target ID, an external LUN, LUN combination information, an internal LUN, and a head LBA are used. , The number of blocks, the WWN, the S_ID, and the attributes need not be provided. For example, the first LBA is as shown in FIG.
As can be understood from the above, since it can be calculated as the accumulation of the number of blocks of the internal LU until immediately before the plurality of separated internal LUs correspond to one external LU, the calculation is performed whenever necessary. It should be good. The point is that the connection between the external LUN and the internal LUN of the storage that can be seen from the computer is clearly defined, and it is sufficient if the combination can be used to identify which computer is used.

[0061]

According to the present invention, there is an effect that the configuration of the logical volume area inside the storage device can be freely changed. Further, there is an effect that the logical volume area can be expanded while continuing to access the existing logical volume. Furthermore, since the configuration can be changed inside the storage device, there is an effect that the logical volume area can be expanded independently of the OS of the computer. Further, since a plurality of divided logical volumes can be gathered in a physical continuous area and integrated into one logical volume, there is an effect that the management of logical volumes becomes easier.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a computer system according to a first embodiment of the present invention.

FIG. 2 shows an LU included in the storage 1 according to the first embodiment of the present invention.
The figure which shows an example of an N map.

FIG. 3 is a diagram illustrating a flowchart of a configuration change of a logical volume LU according to the first embodiment of the present invention.

FIG. 4 shows an internal L of a physical disk area according to the first embodiment of the present invention.
The figure which shows the state of U.

FIG. 5 is a diagram showing a LUN before changing an internal LU according to the first embodiment of the present invention.
The figure which shows the example of a map.

FIGS. 6A to 6C are diagrams showing examples of LUN maps after an internal LU is changed according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a state of an internal LU in the physical disk area of FIG.

FIG. 8 is a configuration diagram of a computer system according to a second embodiment of the present invention.

FIG. 9 is a diagram showing a flowchart of a configuration change of a logical volume LU according to the second embodiment of the present invention.

FIGS. 10A to 10C are diagrams showing states of internal LUs in a physical disk area corresponding to a configuration change of a logical volume LU according to the second embodiment of the present invention.

FIG. 11 shows an LU before an internal LU is changed according to the second embodiment of the present invention.
The figure which shows the example of an N map.

FIG. 12 is a diagram showing the LU after the change of the internal LU according to the second embodiment of the present invention;
The figure which shows the example of an N map.

FIG. 13 is a diagram illustrating a flowchart of a configuration change of a logical volume LU according to the third embodiment of the present invention.

FIGS. 14A and 14B are diagrams showing states of internal LUs in a physical disk area corresponding to a configuration change of a logical volume LU according to the third embodiment of the present invention.

FIG. 15 is a diagram showing a configuration example of a conventional storage.

[Explanation of symbols]

1: storage, 11: LU control means, 111: LUN
Map, 12: physical disk area, 120: internal LU,
121: logical volume, 122: external LU, 123:
Free area, 13: copy means, 2: computer, 21: FS
/ LVM, 211: LU recognition means, 3: Fiber channel connection device, 4: management console, 41: management utility, 5: fiber channel, 6: LAN, 7: communication interface, 100: storage, 101: physical disk area, 1011: Internal LU, 102: Additional disk area.

Continued on the front page (72) Inventor Kenji Muraoka 2880 Kozu, Odawara-shi, Kanagawa Prefecture, Hitachi, Ltd.Storage Division (72) Inventor Yasuyuki Amimatsu 1099 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Prefecture Hitachi, Ltd.System Development Co., Ltd. F-term in the laboratory (reference) 5B065 BA06 CC03 CC04 EA33 ZA06 5B082 CA19

Claims (13)

[Claims] 1. A computer system comprising at least one or more computers, a storage having a logical volume usable by the computer, and a management utility for instructing a change in the logical volume configuration of the storage, wherein the computer comprises the storage Logical volume recognizing means for recognizing a change in the configuration of a logical volume, wherein the storage comprises a logical volume control means for controlling the configuration of the logical volume, and the logical volume control means comprises a logical volume describing configuration information of the logical volume A volume number map, wherein the logical volume control means, in accordance with an instruction from the management utility, a logical volume number visible to the computer described in the logical volume number map and an internal logical volume number visible to the computer Computer system wherein changes the assignment of the internal logical volume number of the storage, characterized in that it allows a plurality of allocation of internal logical volume number of the storage corresponding to the logical volume visible from the computer corresponding. 2. The logical volume number map describes a logical volume number seen from the computer, a logical volume number inside the storage, and a connection relationship between the logical volume number seen from the computer and the internal logical volume number of the storage. Logical volume control information, and the logical volume control means, in accordance with an instruction from the management utility, associates a logical volume number visible from a computer to an internal logical volume of a storage whose correspondence with a computer is undefined, and The logical volume configuration change is performed by describing a new connection relationship with the internal logical volume number in a logical volume number map, and the logical volume recognition means recognizes the logical volume configuration change allocated to the computer. Total of 1 Machine system. 3. The logical volume number map describes the number of blocks indicating the size of the internal logical volume, and when a plurality of internal logical volumes are allocated, specifies the start address of each internal logical volume. 2. The computer system according to claim 1, wherein the number of blocks of the internal logical volume up to immediately before is accumulated. 4. The logical volume number map describes the number of blocks indicating the size of the internal logical volume, and when a plurality of internal logical volumes are allocated, specifies the start address of each internal logical volume. 3. The computer system according to claim 2, wherein the number of blocks of the internal logical volume up to immediately before is accumulated. 5. A computer system comprising at least one computer, a storage having a logical volume usable by the computer, and a management utility for instructing a change in the logical volume configuration of the storage, wherein the computer is the storage Logical volume recognizing means for recognizing a change in the configuration of a logical volume, wherein the storage comprises a logical volume control means for controlling the configuration of the logical volume, and the logical volume control means comprises a logical volume describing configuration information of the logical volume A volume number map and copy means for copying the logical volume, wherein the logical volume control means, in accordance with an instruction from the management utility, determines the capacity of an internal logical volume area not defined from the description of the logical volume number map. A comparison is made with the capacity required by the management utility, and only when the capacity of the undefined internal logical volume area is large, a new internal logical volume is defined in the undefined internal logical volume area, and the A computer system for copying the recorded contents of an area of a designated logical volume number, and setting a new internal logical volume number in a newly defined internal logical volume area according to the completion of the copy. 6. The logical volume number map stores, when a new internal logical volume number is set in a newly defined internal logical volume area, an area corresponding to a logical volume number specified by the management utility. 6. The computer system according to claim 5, wherein the correspondence with the computer is changed to an undefined internal logical volume. 7. The logical volume control means, while the copying by the copying means is being performed, renews access from the computer to the storage to an area corresponding to a logical volume number designated by the management utility. 6. The computer system according to claim 5, wherein the processing is performed in parallel with an internal logical volume area to be defined. 8. A computer system comprising at least one or more computers, a storage having a logical volume usable by the computer, and a management utility for instructing a change in the logical volume configuration of the storage, wherein the computer comprises the storage Logical volume recognizing means for recognizing a change in the configuration of a logical volume, wherein the storage comprises a logical volume control means for controlling the configuration of the logical volume, and the logical volume control means comprises a logical volume describing configuration information of the logical volume. A volume number map and copy means for copying the logical volume, wherein the logical volume control means, in accordance with an instruction from the management utility, determines the capacity of an internal logical volume area not defined from the description of the logical volume number map. It compares the requested capacity serial management utility, when the capacity of the undefined internal logical volume area is large,
A new internal logical volume is defined in the undefined internal logical volume area, the recorded contents of the area of the logical volume number designated by the management utility are copied, and the newly defined internal logical volume area is copied according to the completion of the copy. A new internal logical volume number, and if the capacity of the undefined internal logical volume area is insufficient, it can be seen from the computer described in the logical volume number map according to an instruction from the management utility. Change the assignment of the logical volume number and the internal logical volume number of the storage corresponding to the internal logical volume number seen from the computer, and assign a plurality of the internal logical volume numbers of the storage corresponding to the logical volume seen from the computer. Characterized by the ability to Computer system. 9. The logical volume number map describes a logical volume number seen from the computer, a logical volume number inside the storage, and a connection relationship between the logical volume number seen from the computer and the internal logical volume number of the storage. Logical volume control information, and the logical volume control means, in accordance with an instruction from the management utility, associates a logical volume number visible from a computer to an internal logical volume of a storage whose correspondence with a computer is undefined, and The logical volume configuration change is performed by describing a new connection relationship with the internal logical volume number in a logical volume number map, and the logical volume recognition means recognizes the logical volume configuration change allocated to the computer. Total of 8 Machine system. 10. The logical volume number map describes the number of blocks indicating the size of the internal logical volume, and when a plurality of internal logical volumes are allocated, specifies the start address of each internal logical volume. 9. The computer system according to claim 8, wherein the number of blocks of the internal logical volume up to immediately before is accumulated. 11. The logical volume number map describes the number of blocks indicating the size of the internal logical volume, and when a plurality of internal logical volumes are allocated, specifies the start address of each internal logical volume. 10. The computer system according to claim 9, wherein the number of blocks of the internal logical volume up to immediately before is accumulated. 12. The logical volume number map, when a new internal logical volume number is set in a newly defined internal logical volume area, stores an area corresponding to a logical volume number specified by the management utility.
9. The computer system according to claim 8, wherein the correspondence with the computer is changed to an undefined internal logical volume. 13. The logical volume control means, while a copy is being performed by the copy means, renews access from the computer to the storage to an area corresponding to a logical volume number designated by the management utility. 9. The computer system according to claim 8, wherein the processing is performed in parallel with an internal logical volume area to be defined.