HP 6400/8400 HP StorageWorks Enterprise Virtual Array Updating Product Softwar - Page 32

IBM AIX, Checking or changing timeouts, Linux

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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 Setting PR_key_value Algorithm hcheck_interval hcheck_mode queue_depth reserve_policy rw_timeout Value NA fail_over 60 nonactive 8 Single path 60 Description Sets the key value for persistent reservations. Persistent reservations are not supported. 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. 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-Checks all I/O paths for Failed status, and checks standby paths for Used/Opened devices. Sets the queue depth. Sets the reserve policy to standard SCSI-2 reservations. Sets the read/write timeout to 60 seconds. 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 32 Preparing for the upgrade

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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
Description
Value
Setting
Sets the key value for persistent reservations. Persistent reservations
are not supported.
NA
PR_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_over
Algorithm
Sets the path health feature to check each device every 60 seconds.
60
hcheck_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.
nonactive
hcheck_mode
Sets the queue depth.
8
queue_depth
Sets the reserve policy to standard SCSI-2 reservations.
Single path
reserve_policy
Sets the read/write timeout to 60 seconds.
60
rw_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 upgrade
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