HP StorageWorks Snapshot XP user guide Part number: T1782-96003 Second edition: December 2005
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About this guide This guide provides information about the following: • Understanding Snapshot XP • Installing Snapshot XP • Using Snapshot XP • Troubleshooting Snapshot XP Intended audience This guide is intended for customers and HP-authorized service providers with knowledge of the following: • Disk array hardware and software • Data processing and RAID storage subsystems and their basic functions NOTE: The functions described in this manual may be limited, depending on your assigned level of user acces
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Contents About this guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prerequisites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Firmware versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related documentation . . . . . . . . . . . . . .
Creating or deleting virtual volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Creating new virtual volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Deleting virtual volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Creating Snapshot XP pairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 11 12 13 14 Pop-up menu in Preset list on Business Copy XP main pane . Pop-up menu in Pool tree . . . . . . . . . . . . . . . . . . . . . . . . Pop-up menu in the V-VOL group tree . . . . . . . . . . . . . . . . Snapshot XP history reference codes and messages . . . . . . Troubleshooting for Snapshot XP . . . . . . . . . . . . . . . . . . . .. .. .. .. .. . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . .. .. .. .. .. . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . .. .. .. .. .. .. .. ..
1 Snapshot XP Overview The HP StorageWorks XP10000 and XP12000 disk arrays provide an extensive suite of data replication software. This chapter describes HP StorageWorks Snapshot XP. This chapter also covers portions of HP StorageWorks Business Copy XP (BC) because Snapshot XP is an integrated feature of BC. NOTE: The use of Snapshot XP, Business Copy XP, and all other software products is governed by the terms of your license agreements with Hewlett-Packard.
Figure 1 illustrates the mechanism Snapshot XP uses to copy data in the XP10000/XP12000. Figure 1 Snapshot XP mechanism In Figure 1, Data A is stored in the Snapshot XP pair’s P-VOL. When the host requests to update Data A to Data B, Snapshot XP copies Data A to the pool volume (pool-VOL) in the pool before updating the P-VOL. After the copy operation for Data A is complete, Snapshot XP writes Data B to the area where Data A was stored in the P-VOL, and the P-VOL is updated.
Business Copy XP Use Business Copy XP to maintain disk array-internal copies of all user data on the XP10000/XP12000 for data on open systems such as UNIX and PC servers. Business Copy XP creates a pair of P-VOL and S-VOL, both of which are logical volumes in the same disk array. Pairs that Business Copy XP creates are called Business Copy XP pairs. RAID-protected S-VOLs are created within the same XP10000/XP12000 as the P-VOL. Use Business Copy XP to create up to three S-VOLs for a P-VOL.
Table 1 Requirements for Snapshot XP P-VOLs (continued) Item Requirement Path definition Required Maximum capacity 2 TB Snapshot XP secondary volumes Table 2 Requirements for Snapshot XP S-VOLs Item Requirement Volume type V-VOL You cannot specify the following volumes as Snapshot XP S-VOLs: • • Volumes used as a Snapshot XP pair’s S-VOL Volumes used by another software product’s pair or migration plan NOTE: A LUSE S-VOL must be paired with a P-VOL that has the same size and structure.
information about shared memory requirements, see Table 4 on page 18. To install additional shared memory, contact your HP Account Support Representative. There are two areas in the V-VOL management area: pool management block and pool association information. When you create pools or Snapshot XP pairs, the pool management block or pool association information is stored in the V-VOL management area. Therefore, the V-VOL management area’s available capacity decreases.
A V-VOL’s definition cannot be released if the V-VOL is being used as a Snapshot XP pair’s S-VOL. To release the definition, delete the Snapshot XP pair using the V-VOL. NOTE: Servers (including RAID Manager) show the V-VOLs with emulation type 0 (for example, OPEN-0V). When you create a Snapshot XP pair, specify the volume with emulation type 0, such as OPEN-0V, as the S-VOL. To delete a V-VOL, use the V-VOL pane in Command View XP or XP Remote Web Console.
To restore a Snapshot XP pair, use a RAID Manager command. For more information, see ”Restoring Snapshot XP pairs” on page 47. Copy Threshold option: If the local disk array’s load increases, host server I/O performance (response) might be degraded. If Snapshot XP performs restore operations when the disk array’s load is heavy, it is more likely that host server I/O performance (response) might be degraded.
distinguish between SMPL and SMPL(PD) volumes using RAID Manager, issue the inqraid command as well. The inqraid command shows whether Snapshot XP is using the volume. As a result of the inqraid command, if Snapshot XP is not using the volume, the volume status is SMPL. If Snapshot XP is using the volume, the volume status is SMPL(PD).
• After you install additional shared memory for the V-VOL management area, you cannot partially uninstall it. To uninstall additional shared memory for the V-VOL management area, you must uninstall the entire shared memory that was added for the V-VOL management area. • Skip step 1 if shared memory for the differential tables is already installed. • Note that step 2 and step 3 are interchangeable. • Skip step 3 if Business Copy XP is already installed on the disk array.
Therefore, a maximum of 6,826 Snapshot XP pairs can be created.
Using the number of pair tables Hitachi FlashCopy Mirroring Version 2 and Snapshot XP pairs use pair tables to store control information needed to manage pairs. To create an Hitachi FlashCopy Mirroring Version 2 or Snapshot XP pair, you need one pair table for each pair. Usually, up to 32,768 pair tables are available in one disk array.
Remote Web Console to delete pairs. For more information about each operation, see ”Snapshot XP operations” on page 18. NOTE: • Before creating a pool, the virtual volume management area must be created in shared memory. Virtual volume management areas are automatically created when additional shared memory is installed. For more information about installing additional shared memory, contact your HP Account Support Representative.
1. If a volume is not assigned to a Snapshot XP pair, its status is SMPL. 2. Issue the paircreate command on the SMPL volume to create a Snapshot XP pair. When creating the first pair for the P-VOL, the pair status changes to COPY. When the operation completes, the pair status changes to PAIR. If you specify a volume that is already paired with one or more S-VOLs as the P-VOL to create another pair, the pair status does not change to COPY. When the operation completes, the pair status changes to PAIR.
Use RAID Manager commands to operate Snapshot XP pairs. However, whether the operations complete normally or not depends on the pair status. Table 6 shows the pair status and results of the RAID Manager commands.
• For one snapshot data If the same P-VOL area is updated only once, copy capacity is equal to the capacity of data written between storing and deleting snapshot data. For example, to make a backup using Snapshot XP, you can back up S-VOL data after storing the snapshot data, and then delete the snapshot data. In this case, only data written during the backup must be copied to the pool, and there is only one snapshot data. Therefore, you can make a backup with a pool with small capacity.
Combining Snapshot XP with other software products You can create Snapshot XP pairs by sharing volumes with Continuous Access XP or Continuous Access XP pairs. In addition, you can create Snapshot XP pairs using volumes to which LUN Security XP Extension or RAID Manager have assigned attributes. Table 7 shows whether or not Snapshot XP pairs can share volumes with other software products.
2. Click the BC button. The Business Copy XP main pane appears. Figure 5 Business Copy XP main pane NOTE: Although the Business Copy XP main pane displays information about Business Copy XP and Snapshot XP pairs, this section only explains items related to Snapshot XP pairs. For more information about items related to Business Copy XP pairs, see the HP StorageWorks Business Copy XP User Guide for the XP10000/XP12000.
• Preset list Displays operations that have been performed in the Business Copy XP main pane, but have not been applied to the XP10000/XP12000. To apply operations displayed in the Preset list to the XP10000/XP12000, click Apply. For more information, see ”Preset List” on page 31. • Apply button Applies operations displayed in the Preset list to the XP10000/XP12000. If specified operations are applied successfully, the Preset list is cleared.
• Next button When the total number of volumes in the disk array is more than 1,024, displays the next page of the volume list. If the number of items in the volume list is less than 1,024, this button is grayed out. • Port P-VOL’s port ID (cluster and channel number). • G-ID P-VOL’s host group ID. • LUN P-VOL’s CU:LDEV (control unit image:logical device ID). NOTE: An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
• Prog./Sync. Consistency rate of the Snapshot XP pair’s P-VOL and S-VOL. Displayed information changes according to the pair’s status. See Table 8. Table 8 Information displayed in Prog./Sync. Pair status Displayed information SMPL --- COPY Consistency rate of the P-VOL and S-VOL in percent (%) PAIR COPY(RS) COPY(RS-R) PSUS PSUE --- SMPL(PD) For more information about what is displayed for Business Copy XP pairs, see the HP StorageWorks Business Copy XP User Guide for the XP10000/XP12000.
• Pairs W(X)/Y/Z • W: Total number of Business Copy XP pairs. • X: Total number of Business Copy XP and ShadowImage for z/OS pairs. • Y: Total number of Snapshot XP pairs. • Z: Maximum number of pairs (Business Copy XP, Snapshot XP, ShadowImage for z/OS, Auto LUN XP, Flex Copy XP, Hitachi FlashCopy Mirroring, Hitachi FlashCopy Mirroring Version 2) that can be created in one disk array.
NOTE: An LDEV number ending with V (for example, 00:01 V) indicates the LDEV is a virtual volume. • Pace --- appears. For more information about what is displayed for Business Copy XP pairs, see the HP StorageWorks Business Copy XP User Guide for the XP10000/XP12000. • CLPR(P) P-VOL’s cache logical partition. • CLPR(S) S-VOL’s cache logical partition. • Code Cause of error. If there is no error, --- appears. • Pop-up menu When you select items in the Preset list and right-click, a pop-up menu appears.
2. Click Display Filter, or right-click the volume list, and select Display Filter. The Display Filter pane appears. Figure 8 Display Filter pane (Snapshot XP tab selected) NOTE: • For more information about the Business Copy XP tab on the Display Filter pane, see the HP StorageWorks Business Copy XP User Guide for the XP10000/XP12000. • Filter settings are only effective within the current operations in the Business Copy XP main pane.
• Pair Status • Business Copy: Displays or hides Business Copy XP pairs. • Snapshot XP: Displays or hides Snapshot XP pairs. NOTE: If the check box is not selected, all check boxes in each tab are grayed out. • Business Copy tab This tab is for Business Copy XP pairs. For more information, see the HP StorageWorks Business Copy XP User Guide for the XP10000/XP12000. • Snapshot XP tab Check boxes indicate the status of Snapshot pairs displayed.
• Pool Mng. Block used capacity: X GB Capacity of pool management blocks in use. CAUTION: The value of Total Capacity in the Pool Information box and the value of Pool Mng. Block used capacity are approximately equal, but there might be some difference. Even if the value of Total Capacity in the Pool Information box is updated when pool-VOLs are added to or deleted from the pool, the value of Pool Mng. Block used capacity is not updated until you click Apply.
• Free LDEVs From volumes in the CU selected in the CU drop-down list, volumes that can be specified as pool-VOLs. • CU: Volumes in the selected CU are displayed in the Free LDEVs list.
4. Select the pool usage rate threshold from the Threshold drop-down list. CAUTION: If the pool’s usage rate exceeds the threshold, you cannot create new Snapshot XP pairs. Ensure that you do not set the threshold at too small a value. 5. Select Snapshot XP from the Attribute drop-down list. 6. Check the setting contents. If there is no problem, click Set. The New Pool pane closes, and the new pool appears in the Pool tree. 7. Select the pool in the Pool tree. 8.
NOTE: Do not enter a pool ID that is already used by another pool. If you enter a pool ID that is already used by another pool and click Set, an error message appears. In that case, enter a different number for the new pool ID. • Threshold Threshold of the pool usage rate between 20 and 95. NOTE: The threshold unit is percent (%). If the pool usage rate exceeds the threshold, the pool status changes to Warning. You cannot create new Snapshot XP pairs to a pool in Warning status.
Deleting pools 1. Change the Command View XP or XP Remote Web Console mode to Modify. For more information about changing the mode, see the HP StorageWorks Command View XP User Guide for XP Disk Arrays or the HP StorageWorks XP Remote Web Console User Guide for XP12000/XP10000. 2. Select and right-click the pool you want to delete, and select Delete Pool. A confirmation message appears asking if it is OK to delete the selected pool. 3. Click OK.
3. Click the V-VOL tab. The V-VOL pane appears. Figure 12 V-VOL pane NOTE: In the V-VOL pane, you can create or delete V-VOLs for a V-VOL group. To create or delete a V-VOL by itself, use Volume Management. You need another license to use Volume Management. For more information about Volume Management, see the HP StorageWorks LUN Configuration and Security Manager User Guide for the XP10000/XP12000.
• V-VOL list (right area of the panel) Information about V-VOLs registered in the VDEV selected in the V-VOL group tree. The following items appear in the list: • CU:LDEV: V-VOL’s CU and LDEV numbers • Capacity: V-VOL’s capacity • Emulation: V-VOL’s emulation type NOTE: If the emulation type is followed by CVS, the volume is a customized volume (CV). For more information about CV, see the HP StorageWorks LUN Configuration and Security Manager User Guide for the XP10000/XP12000.
• The V-VOLs you are creating are used when you specify the Snapshot XP pair’s S-VOLs. Since the capacity of the Snapshot XP pair’s P-VOL and S-VOL must be equal, consider the P-VOL’s capacity when you decide the V-VOL capacity. 10.Enter the number of V-VOLs you want to create in the Number of V-VOL text box. NOTE: You can enter only a whole number from 1 to 256 in this text box. 11.Click Set. The volumes are added to the V-VOL information setting list (middle of the pane).
The New V-VOL Group panel displays the following items: • V-VOL Group V-VOL group ID. Enter a whole number from 1 to 8192. NOTE: Do not enter a V-VOL group ID that is already used by another V-VOL group. If you enter a V-VOL group ID that is already used by another V-VOL group and click Next, an error message appears. In that case, enter a different number for the new V-VOL group ID. • Emulation Type V-VOL group’s emulation type. • CLPR V-VOL group’s CLPR.
• Set button Adds V-VOLs to the V-VOL information setting list. • Delete button Deletes selected V-VOLs from the V-VOL information setting list. • V-VOL information setting list (middle of pane) Information about the V-VOL(s) you are creating. • No.: Number • Emulation: V-VOL’s emulation type • Capacity: V-VOL’s capacity • Back button Returns to the New V-VOL Group pane while maintaining settings in this pane. • Next button Confirms the setting in this pane, and displays the Create V-VOL wizard pane (2).
Gray cells indicate LDEV numbers that are already used for other volumes, white cells indicate unused LDEV numbers, and blue cells indicate LDEV numbers selected for V-VOLs in this pane. • Select CU No. CU number. • Interval Interval between LDEV numbers to be assigned to newly created V-VOLs. If you select 0, LDEV numbers are sequential. NOTE: • The value you specify as the interval between LDEV numbers counts only available LDEV numbers and skips those that are not selectable.
• Emulation: V-VOL’s emulation type • Capacity: V-VOL’s capacity • CU:LDEV: V-VOL’s CU and LDEV numbers • Back button Returns to the Create V-VOL wizard pane (2) while maintaining settings in this pane. • OK button Fixes the setting in the Create V-VOL wizard pane (3), and closes the pane. • Cancel button Cancels the setting in the Create V-VOL wizard pane (3), and closes the pane. Deleting virtual volumes 1. Change the Command View XP or XP Remote Web Console mode to Modify.
NOTE: Snapshot XP does not support Quick Split mode. If you specify Quick Split mode, snapshot data is not be stored in the pool even if the command ends normally. Restoring Snapshot XP pairs Use the RAID Manager pairresync -restore command to restore Snapshot XP pairs. The Snapshot XP pair must be in PSUS status when you restore the pair. When the restoration is complete, the pair status changes to PAIR.
4. Select and right-click the Snapshot XP pairs you want to delete. NOTE: You cannot delete a Business Copy XP pair and Snapshot XP pair at one time. 5. Select Pairsplit-S. The Pairsplit-S pane (Figure 17) appears. 6. Click OK. The Pairsplit-S pane closes, and a list of Snapshot XP pairs you are deleting appears in the Preset list on the Business Copy XP main pane. 7. Click Apply. A confirmation message appears asking if it is OK to apply the setting to the disk array. 8. Click OK.
Deleting Snapshot XP pairs by selecting pairs per pool 1. Launch Command View XP or XP Remote Web Console. 2. Change the Command View XP or XP Remote Web Console mode to Modify. For more information about changing the mode, see the HP StorageWorks Command View XP User Guide for XP Disk Arrays or the HP StorageWorks XP Remote Web Console User Guide for XP12000/XP10000. 3. Select the BC button. The Business Copy XP main pane appears. 4. Select the Snapshot XP tab. The Snapshot XP pane (Figure 18) appears. 5.
• Usage rate: Pool’s usage rate • Pool VOL(s): Total number of pool-VOLs in the pool • Snapshot pair(s): Total number of snapshot data stored in the pool If you select a pool icon in the tree, the pool/volume list displays a list of Snapshot XP pairs in the pool, including the following items: • P-Vol: P-VOL’s port ID, host group ID, and LUN • MU: Snapshot ID • Status: Snapshot XP pair status • S-Vol: S-VOL’s port ID, host group ID, and LUN • Pool used(GB): Pool capacity the S-VOL uses • Sync.
Displaying detailed information about Snapshot XP pairs To display detailed information about Snapshot XP pairs, use the Detail or S-Vol Path pane. In the Detail pane, you can see information such as a P-VOL’s pool usage rate and snapshot IDs. In the S-Vol Path panel, you can see pair information such as port ID, host group ID, or LUN. Detail pane 1. Display the Business Copy XP main pane. 2. Select and right-click a Snapshot XP pair in the volume list. A pop-up menu appears. 3. Select Detail.
• Status: Snapshot XP pair status • Time: Time when snapshot data is stored in the pool • Pool used(GB): Pool capacity the S-VOL uses • Sync.: Consistency rate of the P-VOL and S-VOL data • CLPR(S): S-VOL’s cache logical partition (CLPR) • Refresh button Updates information in the Detail pane. • OK button Closes the Detail pane. S-Vol Path Information pane 1. Display the Business Copy XP main pane. 2. Select and right-click a Snapshot XP pair in the volume list. A pop-up menu appears. 3. Select S-Vol Path.
• OK button Closes the S-Vol Path pane. Displaying operation history To display the history of operations on Snapshot XP pairs (such as creating pairs, deleting pairs, and storing snapshot data in the pool), use the History pane. 1. Launch Command View XP or XP Remote Web Console. 2. Select the BC button. The Business Copy XP main pane appears. 3. Select the History tab. The History panel appears. NOTE: To update information on the History pane, click Refresh.
• Message Message indicating the operation or Snapshot XP pair’s status. See Table 13. Table 13 Snapshot XP history reference codes and messages Code Message Description 0x2001 PAIR A Snapshot XP pair was created. 0x2011 PSUS A Snapshot XP pair was split. 0x2021 SMPL A Snapshot XP pair was deleted. 0x2030 COPY(RS-R) START Restoration of a Snapshot XP pair started. 0x2031 COPY(RS-R) END Restoration of a Snapshot XP pair ended normally.
Troubleshooting Snapshot XP Table 14 shows problems that are likely to occur when using Snapshot XP. The table describes the causes of the problems and what you should do to solve the problems. Table 14 Troubleshooting for Snapshot XP Problem Cause and solution Cannot install Snapshot XP. Causes: • • • Shared memory for the V-VOL management area is not installed. Shared memory is not set for the V-VOL management area. Shared memory for the differential tables is not installed.
Table 14 Troubleshooting for Snapshot XP (continued) Problem Cause and solution Cannot add pool-VOLs. Causes: • • 1,024 pool-VOLS are already set in the pool. Available pool management block in the V-VOL management area (which is in shared memory) is insufficient. Solutions: • • Cannot create Snapshot XP pairs. Add pool-VOLs to another pool. See”Creating new pools” on page 36. Initialize the V-VOL management area. See ”Initializing V-VOL management areas” on page 39.
When problems cannot be solved by the solutions in Table 14 or when problems that are not in Table 14 occur, contact your HP Account Support Representative. Recovering blocked pools When a pool is blocked, you must recover the pool-VOLs, pool, Snapshot XP pairs, and V-VOLs in this order. This section describes the procedure to recover the blocked pool. Recovering pool-VOLs If the pool-VOL is blocked, contact your HP Account Support Representative. Recovering pools 1. Select the Volume Management button.
Snapshot XP
Index A audience, documentation 3 B battery backup 25 blocked pools, recovering 57 Business Copy XP 12, 26 C calculating maximum number of pairs 19 pool usage 20 capacity, disk arrays 12 capacity, pool 15, 23, 24 Command View XP, troubleshooting 54 conventions document 4 text symbols 4 copy processing temporarily stopping 17 Copy Threshold option 17 COPY(RS-R) status 23, 47 Create V-VOL wizard pane 43 D data copying operations 12 deleting pairs 17, 22, 23, 47 pools 15, 39 V-VOLs 46 Detail pane 51 differe
deleting 15, 39 deleting pairs from 49 settings 38 status 35, 49 storing data 16 storing snapshot data 46 troubleshooting 55 pool-VOLs blocked 57 capacity 15, 23, 24 creating pools 15 data copying operations 12 deleting 15 information about 35 requirements 14 ports, deleting pairs 47 power supply, switching off 25 prerequisites 3 Preset list 31, 50 primary volumes.
X XP Remote Web Console, troubleshooting 54 Snapshot XP user guide 61
