HP XP7 Storage - Manual (Page 81)

the power supply again, the prestaging process is aborted. If the prestaging process is aborted,
you need to perform the prestaging operation again.
•
Access before completion of the prestaging operation
If the Cache Residency cache area is accessed for I/O before the prestaging operation is
complete, the data may not be available in cache at the first I/O access.
•
Prestaging during high cache load
To prevent slow response times for host I/Os, the storage system may interrupt the prestaging
operation when the cache load is heavy.
•
Quick formatting
Do not use the prestaging function if you specify the Cache Residency setting on a volume
during the quick formatting operation. To use the prestaging function after the quick formatting
operation completes, first release the Cache Residency setting and then specify the setting
again with the prestaging setting enabled. For information about quick formatting, see the HP
XP7 Provisioning for Open Systems User Guide or HP XP7 Provisioning for Mainframe Systems
User Guide.
•
Creating, restoring, and deleting a volume
The prestaging process is aborted if a volume is created, deleted, or restored during the
prestaging operation. If the prestaging process is aborted, you need to perform the prestaging
operation again after the create, delete, or restore volume operation is complete.
Managing cache-resident data
•
“Placing specific data into cache” (page 81)
•
“Placing LDEVs into cache” (page 83)
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“Releasing specific data from cache” (page 84)
•
“Releasing LDEVs from cache” (page 85)
•
“Changing modes for data already in cache” (page 86)
•
“Viewing Cache Residency information” (page 87)
Placing specific data into cache
This procedure writes specific data from one or more LDEVs into Cache Residency cache.
Prerequisites
•
Required role: Storage Administrator (System Resource Management)
•
You must enable the Remote Web Console secondary window. For details, see the HP XP7
Remote Web Console User Guide.
1. Display the Remote Web Console main window.
2. Click Actions > Other Function > Cache Residency to open the Cache Residency window.
3. Click to change to Modify mode.
4. In the Cache Residency window, select the desired CLPR from the CLPR: list.
5. In the CU:LDEV tree, select the LDKC and the CU containing the desired LDEV, and then select
the desired LDEV.
The LDEV information table shows the information for the selected LDEV. A dash (-) in the Mode
column indicates an area not already allocated to Cache Residency cache.
Managing cache-resident data 81