HP StorageWorks XP10000 User Manual
Cache lun xp
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- User manual (92 pages) ,
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- Site preparation manual (80 pages)
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Summary of Contents for HP StorageWorks XP10000
- Page 1 HP StorageWorks Cache LUN XP user guide for the XP10000/XP12000 Part number: T1716-96002 Second edition: December 2005...
- Page 2 The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.
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Page 3: Table Of Contents
HP technical support ........ - Page 4 Cache LUN pane............16 Multi Set pane.
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Page 5: About This Guide
18 • ”Partial Cache Residence (PCR) operations” on page 22 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... -
Page 6: Document Conventions And Symbols
Provides additional information. TIP: Provides helpful hints and shortcuts. HP technical support Telephone numbers for worldwide technical support are listed on the HP support web site: http://www.hp.com/support/. Collect the following information before calling: • Technical support registration number (if applicable) •... -
Page 7: Subscription Service
Subscription service HP strongly recommends that customers register online using the Subscriber's choice web site: http://www.hp.com/go/e-updates. Subscribing to this service provides you with e-mail updates on the latest product enhancements, newest driver versions, and firmware documentation updates as well as instant access to numerous other product resources. -
Page 9: Cache Lun Xp For The Xp10000/Xp12000
Cache LUN XP for the XP10000/XP12000 Use HP StorageWorks Cache LUN XP to reserve areas of cache memory on the disk array for storing high-use data from the LDEVs. Data access speed is improved because the cache-resident data is available to the hosts at much faster transfer speeds. -
Page 10: Unit Of Cache Area Allocation
NOTE: For more information about the Basic Information Display pane, refer to the HP StorageWorks XP Remote Web Console user guide. For more information about customized volumes, refer to the HP StorageWorks LUN Configuration and Security Manager XP user guide. -
Page 11: Cache Lun Xp Modes
Example of LBA value setting with LUSE volumes • You cannot allocate Pool-VOLs and V-VOLs for Cache LUN XP. For more information, see the HP StorageWorks Snapshot XP User Guide. Usage Restrictions • If an LDEV is placed in cache, do not use it for BC/Continuous Access XP quick restore operations or Auto LUN migration. -
Page 12: General Cache Capacity
General cache capacity In addition to the Cache LUN XP cache, you should set the general cache capacity according to the number of areas set in priority mode. This prevents a reduction in general cache performance. If the general cache is overloaded (having very little cache space), this can result in a wait for free cache space. -
Page 13: Required Cache Size For Cache Lun Xp
Required cache size for Cache LUN XP The required cache size for Cache LUN XP depends on the operation modes. For example, in bind mode, RAID-1 groups require twice the cache size for user data to use Cache LUN XP. However, RAID-5 or RAID-6 groups require three times the cache size for user data to use Cache LUN XP. - Page 14 For specified volumes: a. OPEN-V Starting value = (↓Setting value of starting address (LBA) ÷ 512↓) Round down the calculated value between the two down arrows (↓) after the decimal point Setting value of starting address (LBA) is the value entered in the operations box on the Cache LUN pane Ending value = (↓Setting value of ending address (LBA) ÷...
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Page 15: Mainframe Systems
NOTE: If a RAID-5 or RAID-6 volume area is changed from priority mode to bind mode and no cache is added, only 33 percent of the user data fits into the area previously assigned for priority mode. The remaining 67 percent is used to save read/write data. If a RAID-1 volume area is changed from priority mode to bind mode and no cache is added, only 50 percent of the user data fits in the area previously assigned for priority mode. -
Page 16: Starting Cache Lun Xp
b. Priority mode Required cache size = (Number of addresses × (128 × (512 + 16) ) ) ÷ 1,024 Units are KB NOTE: If a RAID-5 or RAID-6 volume area is changed from priority mode to bind mode and no cache is added, only 33 percent of the user data fits into the area previously assigned for priority mode. -
Page 17: Ldev Tree
• If you clear this check box and then click Apply, a non-pre-staging operation will be performed, but a pre-staging operation will not be performed. If you select this check box later and then click Apply, only a pre-staging operation will be performed. When a pre-staging operation is in progress, the text Prestaging operation in progress is shown at the bottom of the Cache LUN pane. -
Page 18: Buttons
• Start: The starting address for data that will reside in the cache. This is expressed as a logical block address for open systems and as a cylinder and head address for mainframe systems. • End: The ending address for data that will reside in the cache. This is expressed as a logical block address for open systems and as a cylinder and head address for mainframe systems. -
Page 19: Multi Set Pane
b. Clear the Multi Set / Release check box. c. Click Set. A confirmation dialog box appears. d. Click OK to continue. The new settings are shown in blue on the Cache LUN pane. To cancel operations, click Cancel. Go to step To place specific data from an LDEV into cache: a. -
Page 20: Releasing (Removing) A Cache Extent
For open systems, Cache LUN XP identifies a logical area in units of 128 blocks for OPEN-V, and 96 blocks for other than OPEN-V. For OPEN-V, if you have entered 1 as the starting logical block address and a value less than 128 as the ending logical block address, Cache LUN XP automatically changes the ending block address to 128. -
Page 21: Changing An Extent's Mode And Pre-Staging
c. Click OK to continue. The Multi Release window appears. Figure 5 Multi Release window d. In the CU box, click the CU. e. In the table, click more than one LDEV and then click Release. The Multi Release pane closes and the new settings are shown in blue on the Cache LUN pane. -
Page 22: Partial Cache Residence (Pcr) Operations
Partial Cache Residence (PCR) operations Overview of the PCR function The XP10000/XP12000 has a special network board that allows the array to be connected directly to a LAN. This network connection interface is called Network Attached Storage (NAS). The NAS disk array uses a cache to store two types of data: •... -
Page 23: Pcr Pane
Click the PCR tab. The PCR pane appears. Figure 7 PCR pane PCR pane The PCR pane displays the table of NAS channels available for PCR operations, as well as a pie chart showing PCR cache usage. You can set the PCR cache size for management information (i-node) and log information used by the NAS channel file system. -
Page 24: Viewing The Current Pcr Settings
• Buttons: • Set: Adds the requested PCR operation (set PCR cache) to the PCR information table. • Clear: Enters 0 (zero) into both the i-node and log fields. • Apply: Starts the requested operations listed in the PCR information table. •... -
Page 25: Index
Cache LUN XP Subscriber’s choice, HP supported volumes Firmware free space tasks technical support, HP help HP technical support volumes supported storage web site Subscriber’s choice web site... - Page 27 Figures Cache LUN XP operations............9 Example of LBA value setting with LUSE volumes .
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Page 29: Tables
Tables Recommended and minimum firmware versions ......... 5 Document conventions .