HP EVA P6550 HP P6000 EVA Updating Product Software Guide (XCS 11001100) (5697 - Page 29

IBM AIX, Linux Red Hat and SUSE, Checking or changing timeouts, Native Linux Device-Mapper Multipath

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IBM AIX Checking or changing timeouts AIX requires the disk settings shown in Table 6 (page 29) for the native multipath drives. Table 6 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, RHEL 6, or SLES 9 SCSI device has a default 30-second timeout value with up to 5 retries. The RHEL 5, SLES 10, or SLES 11 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 for driver vendor's multipathing Table 7 QLogic driver parameters Parameter qdepth port_down_retry_count login_retry_count failover load_balancing excludemodel auto_restore Failover enabled 16 30 30 1 1 0x0 0xA0 Single path 16 64 30 0 1 0x0 0xA0 Managing host I/O timeouts for an online upgrade 29

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IBM AIX
Checking or changing timeouts
AIX requires the disk settings shown in
Table 6 (page 29)
for the native multipath drives.
Table 6 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, RHEL 6, or SLES 9 SCSI device has a default 30–second timeout value with
up to 5 retries. The RHEL 5, SLES 10, or SLES 11 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 for driver vendor's multipathing
Table 7 QLogic driver parameters
Single path
Failover enabled
Parameter
16
16
qdepth
64
30
port_down_retry_count
30
30
login_retry_count
0
1
failover
1
1
load_balancing
0x0
0x0
excludemodel
0xA0
0xA0
auto_restore
Managing host I/O timeouts for an online upgrade
29