Managing Cache-Resident Data; Placing Specific Data Into Cache - HPE XP7 User Manual

◦
Smart Tiers volume
◦
Smart Tiers MF volume
External volumes and storage system power off
When external volumes are configured in the storage system, you need to disconnect the
external storage system before powering off the storage system. If you power off the storage
system without performing the disconnect external storage system operation and then turn
on 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
XP7 Provisioning for Open Systems User Guide or 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 146)
"Placing LDEVs into cache" (page 149)
"Releasing specific data from cache" (page 150)
"Releasing LDEVs from cache" (page 151)
"Changing modes for data already in cache" (page 153)
"Viewing Cache Residency information" (page 153)

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 XP7
Remote Web Console User Guide.
146 Cache Residency operations