HP 4400 HP Enterprise Virtual Array Updating Product Software Guide (XCS 10000 - Page 28

IBM AIX, Linux Red Hat and SUSE, Checking or changing timeouts, Configuration recommendations

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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 Setting PR_key_value Algorithm hcheck_interval hcheck_mode queue_depth reserve_policy rw_timeout Value not applicable 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-check feature to check each device every 60 seconds. 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. Sets the queue depth. Sets the reserve policy to standard SCSI-2 reservations. Sets the read/write timeout to 60 seconds. 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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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
Description
Value
Setting
Sets the key value for persistent reservations. Persistent reservations are not
supported.
not applicable
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-check feature to check each device every 60 seconds.
60
hcheck_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.
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 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:
h
t
tp://w
w
w
.hp
.co
m/s
t
o
r
age/s
poc
k
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