HP Surestore Disk Array 12h System Administrator's Guide for HP-UX, MPE, and W - Page 31

Rebuilding the Disk Array, Setting Rebuild Priority

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HP-UX Using the HP-UX System Administration Manager Rebuilding the Disk Array Rebuilding the Disk Array To maintain data redundancy in the event of a disk failure, it is important to rebuild the disk array as quickly as possible. The Auto Rebuild feature does this automatically, so it is enabled by default. For optimum data protection it recommended that Auto Rebuild remain enabled. If you would like more control over the Rebuild process, you can disable Auto Rebuild using the ARM utilities. This will allow you to manually start a Rebuild at the time you choose. A manual Rebuild is initiated using the ARM utilities. See "Rebuilding the Disk Array Manually" in the next chapter for more information. A Rebuild impacts disk array performance while it is in progress, so before starting a Rebuild make sure the appropriate rebuild priority is set. For convenience and maximum protection against disk failure, Auto Rebuild is enabled by default on a new disk array. Setting Rebuild Priority The rebuild priority determines how quickly a Rebuild completes. It allows you to balance the servicing of host I/Os with the rebuilding of the disk array. The same rebuild priority is used for both Auto Rebuilds and manual Rebuilds. A high rebuild priority ensures the Rebuild will be completed at the same priorities as host I/Os. A low rebuild priority gives priority to host I/Os in relation to the Rebuild. To ensure that a Rebuild completes without disrupting data storage, the rebuild priority is set to high by default on new disk arrays. To set the rebuild priority: 1. Select the desired disk array controller from the list. 2. Select "Actions" on the menu bar. 3. Select "Disk Array Maintenance." 4. Select "Modify Array Configuration . . ." 5. Select desired rebuild priority (high or low). 6. Select "OK" to effect the change. 31

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Using the HP-UX System Administration Manager
Rebuilding the Disk Array
31
HP-UX
Rebuilding the Disk Array
To maintain data redundancy in the event of a disk failure, it is important to rebuild the disk array as
quickly as possible. The Auto Rebuild feature does this automatically, so it is enabled by default. For
optimum data protection it recommended that Auto Rebuild remain enabled.
If you would like more control over the Rebuild process, you can disable Auto Rebuild using the ARM
utilities. This will allow you to manually start a Rebuild at the time you choose. A manual Rebuild is
initiated using the ARM utilities. See “
Rebuilding the Disk Array Manually”
in the next chapter for more
information.
A Rebuild impacts disk array performance while it is in progress, so before starting a Rebuild make sure the
appropriate rebuild priority is set.
For convenience and maximum protection against disk failure, Auto Rebuild is enabled by default on a new
disk array.
Setting Rebuild Priority
The rebuild priority determines how quickly a Rebuild completes. It allows you to balance the servicing of
host I/Os with the rebuilding of the disk array. The same rebuild priority is used for both Auto Rebuilds and
manual Rebuilds. A high rebuild priority ensures the Rebuild will be completed at the same priorities as
host I/Os. A low rebuild priority gives priority to host I/Os in relation to the Rebuild.
To ensure that a Rebuild completes without disrupting data storage, the rebuild priority is set to high by
default on new disk arrays.
To set the rebuild priority:
1.
Select the desired disk array controller from the list.
2.
Select “Actions” on the menu bar.
3.
Select “Disk Array Maintenance.”
4.
Select “Modify Array Configuration . . .”
5.
Select desired rebuild priority (high or low).
6.
Select “OK” to effect the change.