HP StorageWorks XP128 User Manual
Cache lun xp
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Also See for StorageWorks XP128:
- User manual (93 pages) ,
- Installation manual (80 pages) ,
- Configuration manual (52 pages)
Related Manuals for HP StorageWorks XP128
Summary of Contents for HP StorageWorks XP128
- Page 1 HP StorageWorks Cache LUN XP user guide for the XP128/XP1024 Part number: T1616-96001 First edition: July 2005...
- Page 2 Hewlett-Packard. The information is provided “as is” without warranty of any kind and 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.
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Page 3: Table Of Contents
HP-authorized reseller........ - Page 4 Tables Document conventions ............6 Restrictions .
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Page 5: About This Guide
• ”Setting (creating) a cache extent” on page 14 • ”Partial Cache Residence (PCR) operations” on page 17 Intended audience This guide is intended for customers and HP authorized service providers experienced with the following: • Disk array hardware and software • Storage systems... -
Page 6: Document Conventions And Symbols
• Applicable error messages • Operating system type and revision level • Detailed, specific questions For continuous quality improvement, calls may be recorded or monitored. HP strongly recommends that customers sign-up online using the Subscriber’s choice web site at http://www.hp.com/go/e-updates. -
Page 7: Hp-Authorized Reseller
• In the United States, call 1-800-345-1518 • Elsewhere, visit http://www.hp.com and click Contact HP to find locations and telephone numbers Helpful web sites For third-party product information, see the following vendor web sites: • http://www.hp.com • http://www.hp.com/go/storage • http://www.hp.com/support... -
Page 9: Cache Lun Xp For The Xp128/Xp1024
Cache LUN XP for the XP128/XP1024 Use 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
Unit of cache area allocation A Cache LUN XP extent is a range of logical blocks within an LDEV. A logical block is 512 bytes. For OPEN-V, a cache extent must have at least 128 Logical Block Addresses (LBAs), or 66 KB. For all other supported open system emulation types, a cache extent must have at least 96 LBAs, or 49.5 KB. -
Page 11: General Cache Capacity
• While destaging to disk, read requests to the same block are delayed until the disk operation is completed. • Priority mode generates write traffic to disk, whereas bind mode does not. 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. -
Page 12: Starting Cache Lun Xp
You cannot change a Cache LUN XP extent after it is configured. To change the specification, you must reset (“release”) the Cache LUN XP extent, and then re-allocate (“set”) the Cache LUN XP extent. Starting Cache LUN XP Click Cache LUN in the left pane. The Cache LUN pane appears. Figure 2 Cache LUN pane Cache LUN pane... -
Page 13: Ldev Table
The LDEV tree does not show Auto LUN-reserved volumes because they cannot be used in Cache LUN XP operations. LDEV table Information about the LDEV selected in the tree appears on a single line in the upper-right portion of the pane. -
Page 14: Buttons
Buttons • Set: Creates a cache extent. • Release: Deletes a cache extent. • Apply: Applies the parameters to the disk array. You can then set or release other cache extents. • Cancel: Cancels the operation. Setting (creating) a cache extent In the LDEV tree of the Cache LUN pane, click the CU:LDEV number of the LDEV you want to put in cache. - Page 15 d. Click OK to continue. The Multi Set pane appears. Figure 3 Multi Set pane e. In the CU drop-down list, click the CU. f. In the table, click more than one LDEV and then click Set. The Multi Set pane closes and the new settings are shown in blue on the Cache LUN pane.
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Page 16: Releasing (Removing) A Cache Extent
Releasing (removing) a cache extent In the LDEV tree of the Cache LUN pane, click the CU:LDEV number of the LDEV you want to remove from cache. The LDEV table displays Cache LUN XP information about the LDEV you selected. Select an extent to be removed from the Cache LUN XP cache. -
Page 17: Partial Cache Residence (Pcr) Operations
Partial Cache Residence (PCR) operations Overview of the PCR function The XP128/XP1024 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 18: Pcr Pane
Click the PCR tab. The PCR pane appears. Figure 6 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 19: 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 20: Pcr Pane
Cache LUN XP for the XP128/XP1024... -
Page 21: Index
Index audience, documentation memory requirements authorized resellers, HP modes available space settings types of battery backup bind mode operations buttons Partial Cache Residence (PCR) cache extents PCR (Partial Cache Residence) about PCR pane creating pie chart removing prerequisites size requirements...