Hp-Ux; Default Timeout Values; Ibm Aix; Checking Or Changing Timeouts - HP 6400/8400 Software Manual

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 IBM AIX timeout settings
Setting
PR_key_value
Algorithm
hcheck_interval
hcheck_mode
queue_depth
reserve_policy
rw_timeout
32 Pre-upgrade tasks
Table 4
Value Description
Sets the key value for persistent reservations. Persistent reservations
NA
are not supported.
Sets the load balancing algorithm to fail_over. All I/O uses a single
fail_over path. The remaining paths are in standby mode. The value round_robin
is not supported.
60 Sets the path health feature to check each device every 60 seconds.
Specifies the I/O paths monitored by the path health checking feature:
nonactive nonactive—Checks all I/O paths for Failed status, and checks standby
paths for Used/Opened devices.
8 Sets the queue depth.
Single path Sets the reserve policy to standard SCSI-2 reservations.
60 Sets the read/write timeout to 60 seconds.
for the native multipath drives.