HP StorageWorks Enterprise Virtual Array 3000/5000 updating product software guide (VCS 3.110) (5697-7959, February 2009)

Table 6 IBM AIX timeou t set tings
Setting
Value
Description
PR_key_value
NA
Sets the key value for persistent reservations. Persistent reservations
are not supported.
Algorithm
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_interval
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: non
active—Checks all I/O paths for Failed status, and
checks stand
by paths for Used/Opened devices.
queue_depth
8
Sets the queue depth.
reserve_policy Single path Sets the reserve policy to standard SCSI-2 reservations.
rw_timeout
60
Sets the rea
d/write timeout to 60 seconds.
Managing application I/O timeouts for an online upgrade
Applications are typically insulated from the online controller firmware upgrade by the operating system
and HBA driver software. Consequently, if the application is running on a properly configured operating
system, the online controller upgrades will be p erformed 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 timeouts 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 survive 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 p eriod of low user activity.
Back up all stor age system data
Estima
ted time to complete: Varies
When to perform: As close a s possible to the upgrade
Before beg i nning 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 b ack up your data before per forming
major o perations such as software upgrades. The backup should be scheduled as close to the upgrade
processaspossible.
For mo
re information about establishing and implementing good backup procedures for the EVA, contact
your HP sales representative.
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Pre-upgrade tasks