HP StorageWorks Enterprise Virtual Array Updating Product Software Guide (XCS 09534000) (5697-0754, October 2010)

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
Linux
NOTE:
RHEL4/SLES9 SCSI device has a default 30 second timeout value and up to 5 retries can occur.
RHEL5/SLES10 SCSI device has a default 60 second timeout and also up to 5 retries can occur. In
general, these timeout periods are adequate to accommodate an online controller software upgrade.
The following configuration recommendations apply to both RedHat and SUSE.
QLogic Driver parameters (failover enabled):
• qdepth = 16
• port_down_retry_count = 30
• login_retry_count = 30
• failover = 1
• load_balancing = 1
• excludemodel = 0x0
• auto_restore = 0xA0
QLogic Driver parameters (single path):
• qdepth = 16
• port_down_retry_count = 64
Preparing for the upgrade32