HP 3PAR X9000 File Serving Software (IBRIX) Implementation Guide (QL226-96987, June 2013)

2. Append the device structure by adding a device sub-structure for HP 3PAR StoreServ Storage
array and the changed multipath parameters for the array.
After all of the edits are made, the relevant sections of the /etc/multipath.conf file
should appear as follows:
NOTE: If you are running Inform OS 3.1.1 or later, change the no_path_retry setting
to 18 and the polling_interval setting to 10.
# cat /etc/multipath.conf
defaults {
user_friendly_names yes
}
devices {
device {
vendor "3PARdata"
product "VV"
polling_interval 5
no_path_retry 12
features "0"
hardware_handler "0"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_selector "round-robin 0"
rr_weight uniform
rr_min_io 100
path_checker tur
failback immediate
}
}
NOTE: For StoreAll OS software to discover storage volumes, the multipath devices created
should be /dev/mapper/mpath, which requires user_friendly_names to be enabled
in default section. If multipath devices are discovered as /dev/mapper/<WWID> then devices
will not be discovered by StoreAll OS software.
Using the Path Checker
Verify that the multipath path checker is set to TUR (Test Unit Ready) and that no_path_retry
is set to 12 in the cluster nodes.
# multipath -v 3
sdaa: vendor = 3PARdata
sdaa: product = VV
sdaa: rev = 0000
sdaa: h:b:t:l = 0:0:0:81
sdaa: tgt_node_name = 0x2ff70002ac0000f4
..
sdaa: path checker = tur (controller setting)
...
===== paths list =====
uuid hcil dev dev_t pri dm_st chk_st vend/prod/rev
350002ac0026100f4 0:0:0:81 sdaa 65:160 1 [undef][ready] 3PARdata,VV
350002ac0026100f4 1:0:0:81 sdab 65:176 1 [undef][ready] 3PARdata,VV
350002ac0026000f4 0:0:0:82 sdac 65:192 1 [undef][ready] 3PARdata,VV
...
mpath272: pgfailback = -2 (controller setting)
mpath272: pgpolicy = multibus (controller setting)
mpath272: selector = round-robin 0 (controller setting)
mpath272: features = 0 (controller setting)
mpath272: hwhandler = 0 (controller setting)
20 Connecting a StoreAll 9300 with Fibre Channel