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46 Posts
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powermt returns paths which map to multiple LUNs
Hello
We are running powermt command which displays the paths
e.g
Pseudo name=emcpoweraw
VPLEX ID=FNM00133700251
Logical device ID=6000144000000010F07C657BBC13D312
state=alive; policy=ADaptive; queued-IOs=0
==============================================================================
--------------- Host --------------- - Stor - -- I/O Path -- -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==============================================================================
4 qla2xxx sdla 04 active alive 0 1
4 qla2xxx sdjx 04 active alive 0 1
4 qla2xxx sdiu 04 active alive 0 1
3 qla2xxx sdw 0D active alive 0 1
3 qla2xxx sdbh 09 active alive 0 1
4 qla2xxx sdci 04 active alive 0 2
3 qla2xxx sddm 01 active alive 0 1
4 qla2xxx sdep 0C active alive 0 2
3 qla2xxx sdfs 05 active alive 0 1
4 qla2xxx sdgo 00 active alive 0 2
4 qla2xxx sdhr 08 active alive 0 2
If we trace back the LUNs for sdla, sdjx etc, we expect all the paths mapping to same LUN.
However we are getting multiple LUNs.
e.g
lrwxrwxrwx 1 root root 0 Jun 26 00:07
/sys/class/scsi_host/host4/device/rport-4:0-0/target4:0:0/fc_transport:target4:0:0/device/4:0:0:49173/block:sdla
-> ../../../../../../../../block/sdla
Similarly for others....
lrwxrwxrwx 1 root root 0 Jun 26 00:07
/sys/class/scsi_host/host4/device/rport-4:0-0/target4:0:0/fc_transport:target4:0:0/device/4:0:0:32789/block:sdjx
-> ../../../../../../../../block/sdjx
lrwxrwxrwx 1 root root 0 Jun 26 00:07
/sys/class/scsi_host/host4/device/rport-4:0-0/target4:0:0/fc_transport:target4:0:0/device/4:0:0:16404/block:sdiu
-> ../../../../../../../../block/sdiu
lrwxrwxrwx 1 root root 0 Feb 20 2015
/sys/class/scsi_host/host3/device/rport-3:0-0/target3:0:0/fc_transport:target3:0:0/device/3:0:0:22/block:sdw
-> ../../../../../../../../block/sdw
Why multiple paths pointing to different lun # ? Is this possible and what does it indicate.
dstratton
33 Posts
1
February 9th, 2016 06:00
This could indicate mismatched paths.
can you please run in the cli powermt check reconfig and see if issue persists, or if have powermt.custom file present please rename and reboot host and see if still reports as I'm also seeing a disordinate number of paths, 11 to be precise.
does the Powerpath GUI label the paths as mismatched at this time?
artRanade
46 Posts
0
February 9th, 2016 09:00
Is there any command to check if the paths are mismatched? When you say disordinate number of paths, as I understand it needs to be even number, is that correct?
dstratton
33 Posts
1
February 9th, 2016 12:00
looks to be accurate output from powerpath
looks to be managing only 1 lun
1 logical device id and 1 pseudo device name given
examples below from other hosts
Pseudo name=emcpowera
Symmetrix ID=000xxxxxxxxx
Logical device ID=01C2
state=alive; policy=SymmOpt; queued-IOs=0
==============================================================================
--------------- Host --------------- - Stor - -- I/O Path -- -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==============================================================================
4 qla2xxx sdde FA 7gB active alive 0 0
4 qla2xxx sdbw FA 9gB active alive 0 0
3 qla2xxx sdao FA 9gB active alive 0 0
3 qla2xxx sdg FA 7gB active alive 0 0
and
powermt display dev=all
Pseudo name=emcpowere
CLARiiON ID=CK20XXXXXXXX [Host-a]
Logical device ID=6006016092861400D4AABXXXXXXX [LUN_44]
state=alive; policy=CLAROpt; priority=0; queued-IOs=0
Owner: default=SP A, current=SP A Array failover mode: 1
=============================================================================
---------------- Host --------------- - Stor - -- I/O Path - -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors =============================================================================
2 lpfc sdg SP B3 active alive 0 0
3 lpfc sdm SP A3 active alive 0 0
artRanade
46 Posts
0
February 9th, 2016 13:00
Thanks for getting back. I did not understand when you said by
" looks to be accurate output from powerpath
looks to be managing only 1 lun
1 logical device id and 1 pseudo device name given"
artRanade
46 Posts
0
February 10th, 2016 12:00
So the situation that for one pseudodevice name, all the paths that we see map to different LUNs in the native path, is that correct.
/sys/class/scsi_host/host4/device/rport-4:0-0/target4:0:0/fc_transport:target4:0:0/device/4:0:0:49173/block:sdla
-> ../../../../../../../../block/sdla
/sys/class/scsi_host/host4/device/rport-4:0-0/target4:0:0/fc_transport:target4:0:0/device/4:0:0:32789/block:sdjx
-> ../../../../../../../../block/sdjx
/sys/class/scsi_host/host4/device/rport-4:0-0/target4:0:0/fc_transport:target4:0:0/device/4:0:0:16404/block:sdiu
-> ../../../../../../../../block/sdiu
/sys/class/scsi_host/host3/device/rport-3:0-0/target3:0:0/fc_transport:target3:0:0/device/3:0:0:22/block:sdw
-> ../../../../../../../../block/sdw
So LUNs are 49173, 32789, 16404, 22 but all of these devices belong to Pseudo name=emcpoweraw. Is this possible?
Ken.Whitehead
24 Posts
0
February 10th, 2016 12:00
Hello Ran_aarti
The PP output is showing us the pseudodevice name and the lun information
We will still see the sys/class/scsi_host/host3/device/rport-3:0-0/target3:0:0/fc_transport:target3:0:0/device/3:0:0:22/block:sdw
-> ../../../../../../../../block/sdw for each of the native paths.
Unless Dustin and I are misunderstanding the situation everything looks to be correct.