Ibm Aix; Linux Red Hat And Suse - HP EVA P6000 Software Manual

IBM AIX

Checking or changing timeouts
AIX requires the disk settings shown in
Table 5 IBM AIX timeout settings
Setting
PR_key_value
Algorithm
hcheck_interval
hcheck_mode
queue_depth
reserve_policy
rw_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
Table 6 QLogic driver parameters
Parameter
qdepth
port_down_retry_count
login_retry_count
failover
load_balancing
excludemodel
auto_restore
Table 5 (page 27)
Value Description
not applicable Sets the key value for persistent reservations. Persistent reservations are not
supported.
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.
60 Sets the path health-check feature to check each device every 60 seconds.
nonactive 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.
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.
Failover enabled
16
30
30
1
1
0x0
0xA0
for the native multipath drives.
Single path
16
64
30
0
1
0x0
0xA0
Managing host I/O timeouts for an online upgrade 27