HP StorageWorks Enterprise Virtual Array updating product software guide (XCS 09522000) (576287-003, October 2010)

IMPORTANT:
Depending on your operating system, changing timeout values may require a reboot of your system.
To minimize disruption of normal operations, schedule reboots one node at a time. In a cluster
environment, plan your reboots one node at a time and shut down the passive node to avoid unwanted
automatic failover.
HP-UX
CAUTION:
Because HP-UX supports boot across Fibre Channel SAN, any change to default SCSI timeouts on
the HP-UX host may cause corruption and make the system unrecoverable.
Default timeout values
• Sdisk timeout: 30 seconds
• (LVM) lvol timeout: 0 seconds (default=0, retries forever)
IBM AIX
Checking or changing timeouts
AIX requires the disk settings shown in Table 4 for the native multipath drives.
Table 4 IBM AIX timeout settings
DescriptionValueSetting
Sets the key value for persistent reservations. Persistent reservations
are not supported.
NAPR_key_value
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.
fail_overAlgorithm
Sets the path health feature to check each device every 60 seconds.60hcheck_interval
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.
nonactivehcheck_mode
Sets the queue depth.8queue_depth
Sets the reserve policy to standard SCSI-2 reservations.Single pathreserve_policy
Sets the read/write timeout to 60 seconds.60rw_timeout
Pre-upgrade tasks32