HP 3PAR HP-UX Implementation Guide

Hardware path = 0/0/4/1/1.0x21520002ac000036.0x400a000000000000
SCSI transport protocol = fibre_channel
State = UNOPEN
Last Open or Close state = ACTIVE
d. To determine all device attributes such as the multipathing policy, timeout values and
device capacity, issue scsimgr getinfo all_lun or scsimgr get_info -D
/dev/rdisk/disk6:
# scsimgr get_info -D /dev/rdisk/disk6
STATUS INFORMATION FOR LUN : /dev/rdisk/disk6
Generic Status Information
SCSI services internal state = UNOPEN
Device type = Direct_Access
EVPD page 0x83 description code = 1
EVPD page 0x83 description association = 0
EVPD page 0x83 description type = 3
World Wide Identifier (WWID) = 0x50002ac0024d0036
Serial number = 024D0036
Vendor id = 3PARdata
Product id = VV
...
I/O load balance policy = round_robin
...
Driver esdisk Status Information :
Capacity in number of blocks = 2097152
Block size in bytes = 512
Number of active IOs = 0
Special properties =
Maximum number of IO retries = 45
IO transfer timeout in secs = 30
FORMAT command timeout in secs = 86400
START UNIT command timeout in secs = 60
Timeout in secs before starting failing IO = 120
IO infinite retries = false
e. The default load balancing policy is round robin. HP offers other load balancing options.
HP 3PAR has tested the round_robin and least_cmd_load load balancing options.
The load balancing policy can be changed globally or for an individual disk.
Example: Issue the following commands to globally change from round_robin to
least_cmd_load:
# scsimgr get_attr -N /escsi/esdisk -a load_bal_policy
SCSI ATTRIBUTES FOR SETTABLE ATTRIBUTE SCOPE : /escsi/esdisk
name = load_bal_policy
current = round_robin
default = round_robin
saved =
# scsimgr set_attr -N /escsi/esdisk -a load_bal_policy=least_cmd_load
Verify it is changed
# scsimgr get_attr -N /escsi/esdisk -a load_bal_policy
SCSI ATTRIBUTES FOR SETTABLE ATTRIBUTE SCOPE : /escsi/esdisk
name = load_bal_policy
current = least_cmd_load
default = round_robin
saved =
Setting Up Multipathing Software on HP-UX 11i v3 27