IBM AIX
Checking or changing timeouts
AIX requires the disk settings shown in Table 5 (page 28) for the native multipath drives.
Table 5 IBM AIX timeout settings
DescriptionValueSetting
Sets the key value for persistent reservations. Persistent reservations are not
supported.
not applicablePR_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-check feature to check each device every 60 seconds.60hcheck_interval
Specifies the I/O paths monitored by the path health-check feature. The value
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 Red Hat and SUSE
NOTE: The RHEL 4/SLES 9 SCSI device has a default 30–second timeout value with up to 5
retries. The RHEL 5/SLES 10 SCSI device has a default 60–second timeout with up to 5 retries. In
general, these timeout periods are sufficient for an online controller software upgrade.
Native Linux Device-Mapper Multipath
If you are using Native Linux Device-Mapper Multipath, see the Native Linux Device-Mapper
Multipath for HP StorageWorks Disk Arrays reference guide for additional configuration details.
The document is located on the Single Point of Connectivity Knowledge website:
http://www.hp.com/storage/spock
In the left navigation pane, select Solutions: Linux under Application Notes.
Configuration recommendations
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
• login_retry_count = 30
28 Preparing for the upgrade
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