HP StorageWorks 4x00/6x00/8x00 Enterprise Virtual Array Updating Product Software Guide XCS 6.110 (5697-6782, June 2007)

IBM AIX
Checking or changing timeouts
AIX requires the disk settings shown in Table 7 for the native multipath d rives.
Ta ble 7 IBM AIX timeout settings
Setting
Value
Description
PR_key_value
NA
Sets the key value for persistent reservations. Persistent reservations
are not supported.
Algor ithm
fail_over Sets the load balancing algorithm to fail_over. All I/O uses a
single path. The remaining paths are in standby mode. The value
round_robin is not supported.
hcheck_inter
val
60
Sets the path health feature to check each device every 60 seconds.
hcheck_mode
nonactive
Specifies the I/O paths monitored by the path health checking
feature: nonactive—Checks all I/O paths for Failed status, and
checks standby paths for Used/Opened devices.
queue_depth
8
Sets the queue depth.
reserve_pol
icy
Single path Sets the rese
rve policy to standard SCSI-2 reservations.
rw_timeout
60
Sets the read/write timeout to 60 seconds.
Managing application I/O timeouts for an online upgrade
Applications are typically insulated from the online controller firmwar e upgrade by the operating system
and H BA driver software. Consequently, if the application is running on a properly con figured operating
system, the online controller upgrades will be performed successfully.
It may be necessary to determine if any applications have timeout requirements that are more stringent
than those of the operating system. Any applications with more stringent time outs should be evaluated
to determine if the application timeouts will be exceeded by the resynchronization interval that occurs
during the online upgrade.
Although an application may sur vive the online firmware upgrade successfully, there may be an impact
on performance. To minimize the performance impact on users, the online upgrade should be performed
during a period of low user activity.
Back up all storage system data
Estimated tim e to complete: Varies
When to
perform: As close as possible to the upgrade
Before
beginning the upgrade, it is recommended that you perform a full verified backup of all storage
system
data. Although not required, it is always good practice to back up your da ta before performing
major o
perations such as software upgrades. The backup should be scheduled as close to the upgrade
processaspossible.
For more information about establishing and implementing good backup procedures for the EVA, contact
your H
P sales representative.
Upgrading HP Command View EVA
Estimated time to complete: 15–20 minutes
HP StorageWorks 4x00/6x00/8x00 Enterprise Virtual Array updating product software guide XCS 6.110
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