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Serial number
Vendor id
Product id
...
I/O load balance policy
...
Driver esdisk Status Information :
Capacity in number of blocks
Block size in bytes
Number of active IOs
Special properties
Maximum number of IO retries
IO transfer timeout in secs
FORMAT command timeout in secs
START UNIT command timeout in secs
Timeout in secs before starting failing IO
IO infinite retries
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 =
Save the load_bal_policy so the change in intact even with reboots.
# scsimgr save_attr -N /escsi/esdisk -a load_bal_policy=least_cmd_load
Verify the change made
# scsimgr get_attr -N /escsi/esdisk -a load_bal_policy
name = load_bal_policy
current = least_cmd_load
default = round_robin
saved = least_cmd_load
# scsimgr get_attr -a load_bal_policy -D /dev/rdisk/disk6
26
Allocating Storage for Access by the HP-UX Host
SCSI ATTRIBUTES FOR SETTABLE ATTRIBUTE SCOPE : /escsi/esdisk
= 024D0036
= 3PARdata
= VV
= round_robin
= 2097152
= 512
= 0
=
= 45
= 30
= 86400
= 60
= 120
= false
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