HP XP P9500 Storage - Manual (Page 129)

Table 23 Status, availability of Data Retention operation (continued)
Referencing access attribute Changing access attribute Pair status Cnt Ac-J
volume
Yes Yes PSUE
Yes Yes SMPL S-VOL
Yes No COPY
Yes No PAIR
Yes No* PSUS
Yes No PSUE
*Note: If the Write option is set to the S-VOL, the access attribute can be changed.
Table 24 Possible changes to access attribute when Continuous Access Journal P-VOL status is PAIR
or COPY
Continuous Access Journal P-VOL status of PAIR or COPY Access attribute
S-VOL Disable Protect Read Only Read/Write -
Yes No No - Read/Write
Yes Yes - Yes Read Only
Yes - Yes Yes Protect
- No No Yes S-VOL Disable
Performance Monitor
Performance Monitor software provides detailed information on I/O activity and hardware
performance in P9500 systems. Storage system usage and the performance data that is collected
and displayed by Performance Monitor enables you to:
•
Identify the optimum timing for performing Continuous Access Journal copy operations.
•
Determine the best locations for the Continuous Access Journal S-VOLs (for example; parity
groups with less frequently accessed volumes to avoid bottlenecks of back-end activity)
•
Monitor storage system performance during Continuous Access Journal operations and during
testing activities.
Use the following procedure to lessen the impact on Continuous Access Journal operations while
Performance Monitor is collecting data for one or more storage systems on the same P9500 internal
LAN:
1.
If Performance Monitor is collecting high amounts of LDEV data, disabling this activity, if
possible, for one or more storage systems.
2. If Performance Monitor is collecting data for more than three storage systems on the P9500
internal LAN, disconnect Performance Monitor, if possible, from one or more storage systems
before using Continuous Access Journal.
3. After you have disabled LDEV data collection and/or disconnected Performance Monitor
wherever possible, then connect to the storage system using Remote Web Console and launch
Continuous Access Journal.
4. When Continuous Access Journal operations are completed, exit Continuous Access Journal
and Remote Web Console.
5. Re-enable Performance Monitor data collection.
For more information on Performance Monitor, see HP P9000 Performance for Open and Mainframe
Systems User Guide.
Performance Monitor 129