HP P10000 HP 3PAR HP-UX 11i v2, v3 Implementation Guide (QL226-96021, August 2 - Page 27

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SCSI ATTRIBUTES FOR LUN : /dev/rdisk/disk6 name = load_bal_policy current = round_robin default = least_cmd_load saved = f. If the load_bal_policy needs to be changed to default, issue the following commands. # scsimgr save_attr -N /escsi/esdisk -a load_bal_policy=default # 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 = CAUTION: Do not change any other default values such as path failover and I/O retry values. g. LUN 0, which is used as a special Array Controller mode when talking with the HP initiator, is seen as a pass through device (pt) created by the esctl driver which only supports path_lockdown load balancing policy. Do not change any of these attributes for LUN 0. # ioscan -kfnNC lunpath lunpath 0 0/0/4/1/0.0x20420002ac000036.0x0 eslpt CLAIMED LUN_PATH LUN path for ctl4 lunpath 4 0/0/4/1/0.0x20420002ac000036.0x4001000000000000 eslpt CLAIMED LUN_PATH LUN path for disk0 # scsimgr get_attr all_lun ... SCSI ATTRIBUTES FOR LUN : /dev/pt/pt4 Device type Serial number Vendor id Product id Product revision I/O load balance policy LUN Path used when policy is path_lockdown 0/0/4/1/0.0x20420002ac000036.0x0 = Array_Controller = 00000000 = 3PARdata = ARRAY = 0000 = path_lockdown = h. You can use the get_stat option to obtain the statistics of a given device and for debug purposes. # scsimgr get_stat -D /dev/rdisk/disk6 STATISTICS FOR LUN :/dev/rdisk/disk6 Generic Statistics: Setting Up Multipathing Software on 11i v3 27

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SCSI ATTRIBUTES FOR LUN : /dev/rdisk/disk6
name = load_bal_policy
current = round_robin
default = least_cmd_load
saved =
f.
If the
load_bal_policy
needs to be changed to default, issue the following commands.
# scsimgr save_attr -N /escsi/esdisk -a load_bal_policy=default
# 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 =
CAUTION:
Do not change any other default values such as path failover and I/O retry
values.
g.
LUN 0, which is used as a special Array Controller mode when talking with the HP
initiator, is seen as a pass through device (
pt
) created by the
esctl
driver which only
supports
path_lockdown
load balancing policy. Do not change any of these attributes
for LUN 0.
# ioscan -kfnNC lunpath
lunpath
0
0/0/4/1/0.0x20420002ac000036.0x0
eslpt
CLAIMED
LUN_PATH
LUN path for ctl4
lunpath
4
0/0/4/1/0.0x20420002ac000036.0x4001000000000000
eslpt
CLAIMED
LUN_PATH
LUN path for disk0
# scsimgr get_attr all_lun
...
SCSI ATTRIBUTES FOR LUN : /dev/pt/pt4
Device type
= Array_Controller
Serial number
= 00000000
Vendor id
= 3PARdata
Product id
= ARRAY
Product revision
= 0000
I/O load balance policy
= path_lockdown
LUN Path used when policy is path_lockdown
=
0/0/4/1/0.0x20420002ac000036.0x0
h.
You can use the
get_stat
option to obtain the statistics of a given device and for debug
purposes.
# scsimgr get_stat -D /dev/rdisk/disk6
STATISTICS FOR LUN :/dev/rdisk/disk6
Generic Statistics:
Setting Up Multipathing Software on 11i v3
27