HP 3PAR Ubuntu Operating System Implementation Guide

May 17 13:18:32 | sda: uid = 360002ac00000000000000020000185e3 (callout)
May 17 13:18:32 | sdb: not found in pathvec
May 17 13:18:32 | sdb: mask = 0x1f
-
===== paths list =====
uuid hcil dev dev_t pri dm_st chk_st vend/p
360002ac00000000000000020000185e3 7:0:0:0 sda 8:0 1 undef ready 3PARda
Displaying Detailed Device-mapper Node Information
Use multipath -l for listing of devices and dmsetup to get detailed dm node information.
NOTE: With no_path_retry set to a value other than 0 in the /etc/multipath.conf file,
I/O will be queued for the period of the retries and features=1 queue_if_no_path will be
shown in multipath -l command output.
For example:
#multipath -l
350002ac0000b011b dm-5 3PARdata,VV
size=5.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=-1 status=active
|- 7:0:0:12 sdaf 65:240 active undef running
|- 6:0:0:12 sdai 66:32 active undef running
|- 8:0:0:12 sdao 66:128 active undef running
`- 5:0:0:12 sdal 66:80 active undef running
NOTE: If you see the device status as undef in the output, this is a defect. Instead, use
multipath -ll command, which shows the correct device status as ready.
For example:
# multipath -ll
350002ac0000b011b dm-5 3PARdata,VV
size=5.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 7:0:0:12 sdaf 65:240 active ready running
|- 6:0:0:12 sdai 66:32 active ready running
|- 8:0:0:12 sdao 66:128 active ready running
`- 5:0:0:12 sdal 66:80 active ready running
The dmsetup command can be used with various options to get more information on Device-mapper
mappings.
For example:
# dmsetup table
350002ac001dc0031: 0 4194304 multipath 1 queue_if_no_path 0 1 1 round-robin 0 2 1 8:0
1000 8:16 1000
# dmsetup ls --target multipath
350002ac001dc0031 (253, 0)
# dmsetup info 350002ac0004b0079
350002ac001dc0031 (253, 0)
# dmsetup info 350002ac001dc0031
Name: 350002ac001dc0031
Displaying Detailed Device-mapper Node Information 29