Hello all,
I'm hoping that somebody can shed some light on a problem that I experienced
yesterday. I've been working with GPFS for a couple months as an admin now, but
I've come across a problem that I'm unable to see the answer to. Hopefully the
solution is not listed somewhere blatantly on the web, but I spent a fair
amount of time looking last night. Here is the situation: yesterday, I needed
to update some firmware on a Mellanox HCA FDR14 card and reboot one of our GPFS
servers and repeat for the sister node (IBM x3550 and DCS3850) as HPSS for our
main campus cluster. However, upon reboot, the server seemed to lose the path
mappings to the multipath devices for the NSDs. Output below:
--
[root@mmmnsd5 ~]# mmlsnsd -m -f gscratch
Disk name NSD volume ID Device Node name Remarks
---------------------------------------------------------------------------------------
dcs3800u31a_lun0 0A62001B54235577 - mminsd5.infini
(not found) server node
dcs3800u31a_lun0 0A62001B54235577 - mminsd6.infini
(not found) server node
dcs3800u31a_lun10 0A62001C542355AA - mminsd6.infini
(not found) server node
dcs3800u31a_lun10 0A62001C542355AA - mminsd5.infini
(not found) server node
dcs3800u31a_lun2 0A62001C54235581 - mminsd6.infini
(not found) server node
dcs3800u31a_lun2 0A62001C54235581 - mminsd5.infini
(not found) server node
dcs3800u31a_lun4 0A62001B5423558B - mminsd5.infini
(not found) server node
dcs3800u31a_lun4 0A62001B5423558B - mminsd6.infini
(not found) server node
dcs3800u31a_lun6 0A62001C54235595 - mminsd6.infini
(not found) server node
dcs3800u31a_lun6 0A62001C54235595 - mminsd5.infini
(not found) server node
dcs3800u31a_lun8 0A62001B5423559F - mminsd5.infini
(not found) server node
dcs3800u31a_lun8 0A62001B5423559F - mminsd6.infini
(not found) server node
dcs3800u31b_lun1 0A62001B5423557C - mminsd5.infini
(not found) server node
dcs3800u31b_lun1 0A62001B5423557C - mminsd6.infini
(not found) server node
dcs3800u31b_lun11 0A62001C542355AF - mminsd6.infini
(not found) server node
dcs3800u31b_lun11 0A62001C542355AF - mminsd5.infini
(not found) server node
dcs3800u31b_lun3 0A62001C54235586 - mminsd6.infini
(not found) server node
dcs3800u31b_lun3 0A62001C54235586 - mminsd5.infini
(not found) server node
dcs3800u31b_lun5 0A62001B54235590 - mminsd5.infini
(not found) server node
dcs3800u31b_lun5 0A62001B54235590 - mminsd6.infini
(not found) server node
dcs3800u31b_lun7 0A62001C5423559A - mminsd6.infini
(not found) server node
dcs3800u31b_lun7 0A62001C5423559A - mminsd5.infini
(not found) server node
dcs3800u31b_lun9 0A62001B542355A4 - mminsd5.infini
(not found) server node
dcs3800u31b_lun9 0A62001B542355A4 - mminsd6.infini
(not found) server node
[root@mmmnsd5 ~]#
--
Also, the system was working fantastically before the reboot, but now I'm
unable to mount the GPFS filesystem. The disk names look like they are there
and mapped to the NSD volume ID, but there is no Device. I've created the
/var/mmfs/etc/nsddevices script and it has the following output with user
return 0:
--
[root@mmmnsd5 ~]# /var/mmfs/etc/nsddevices
mapper/dcs3800u31a_lun0 dmm
mapper/dcs3800u31a_lun10 dmm
mapper/dcs3800u31a_lun2 dmm
mapper/dcs3800u31a_lun4 dmm
mapper/dcs3800u31a_lun6 dmm
mapper/dcs3800u31a_lun8 dmm
mapper/dcs3800u31b_lun1 dmm
mapper/dcs3800u31b_lun11 dmm
mapper/dcs3800u31b_lun3 dmm
mapper/dcs3800u31b_lun5 dmm
mapper/dcs3800u31b_lun7 dmm
mapper/dcs3800u31b_lun9 dmm
[root@mmmnsd5 ~]#
--
That output looks correct to me based on the documentation. So I went digging
in the GPFS log file and found this relevant information:
--
Tue Oct 28 23:44:48.405 2014: I/O to NSD disk, dcs3800u31a_lun0, fails. No such
NSD locally found.
Tue Oct 28 23:44:48.481 2014: I/O to NSD disk, dcs3800u31b_lun1, fails. No such
NSD locally found.
Tue Oct 28 23:44:48.555 2014: I/O to NSD disk, dcs3800u31a_lun2, fails. No such
NSD locally found.
Tue Oct 28 23:44:48.629 2014: I/O to NSD disk, dcs3800u31b_lun3, fails. No such
NSD locally found.
Tue Oct 28 23:44:48.703 2014: I/O to NSD disk, dcs3800u31a_lun4, fails. No such
NSD locally found.
Tue Oct 28 23:44:48.775 2014: I/O to NSD disk, dcs3800u31b_lun5, fails. No such
NSD locally found.
Tue Oct 28 23:44:48.844 2014: I/O to NSD disk, dcs3800u31a_lun6, fails. No such
NSD locally found.
Tue Oct 28 23:44:48.919 2014: I/O to NSD disk, dcs3800u31b_lun7, fails. No such
NSD locally found.
Tue Oct 28 23:44:48.989 2014: I/O to NSD disk, dcs3800u31a_lun8, fails. No such
NSD locally found.
Tue Oct 28 23:44:49.060 2014: I/O to NSD disk, dcs3800u31b_lun9, fails. No such
NSD locally found.
Tue Oct 28 23:44:49.128 2014: I/O to NSD disk, dcs3800u31a_lun10, fails. No
such NSD locally found.
Tue Oct 28 23:44:49.199 2014: I/O to NSD disk, dcs3800u31b_lun11, fails. No
such NSD locally found.
--
Okay, so the NSDs don't seem to be able to be found, so I attempt to rediscover
the NSD by executing the command mmnsddiscover:
--
[root@mmmnsd5 ~]# mmnsddiscover
mmnsddiscover: Attempting to rediscover the disks. This may take a while ...
mmnsddiscover: Finished.
[root@mmmnsd5 ~]#
--
I was hoping that finished, but then upon restarting GPFS, there was no
success. Verifying with mmlsnsd -X -f gscratch
--
[root@mmmnsd5 ~]# mmlsnsd -X -f gscratch
Disk name NSD volume ID Device Devtype Node name
Remarks
---------------------------------------------------------------------------------------------------
dcs3800u31a_lun0 0A62001B54235577 - - mminsd5.infini
(not found) server node
dcs3800u31a_lun0 0A62001B54235577 - - mminsd6.infini
(not found) server node
dcs3800u31a_lun10 0A62001C542355AA - - mminsd6.infini
(not found) server node
dcs3800u31a_lun10 0A62001C542355AA - - mminsd5.infini
(not found) server node
dcs3800u31a_lun2 0A62001C54235581 - - mminsd6.infini
(not found) server node
dcs3800u31a_lun2 0A62001C54235581 - - mminsd5.infini
(not found) server node
dcs3800u31a_lun4 0A62001B5423558B - - mminsd5.infini
(not found) server node
dcs3800u31a_lun4 0A62001B5423558B - - mminsd6.infini
(not found) server node
dcs3800u31a_lun6 0A62001C54235595 - - mminsd6.infini
(not found) server node
dcs3800u31a_lun6 0A62001C54235595 - - mminsd5.infini
(not found) server node
dcs3800u31a_lun8 0A62001B5423559F - - mminsd5.infini
(not found) server node
dcs3800u31a_lun8 0A62001B5423559F - - mminsd6.infini
(not found) server node
dcs3800u31b_lun1 0A62001B5423557C - - mminsd5.infini
(not found) server node
dcs3800u31b_lun1 0A62001B5423557C - - mminsd6.infini
(not found) server node
dcs3800u31b_lun11 0A62001C542355AF - - mminsd6.infini
(not found) server node
dcs3800u31b_lun11 0A62001C542355AF - - mminsd5.infini
(not found) server node
dcs3800u31b_lun3 0A62001C54235586 - - mminsd6.infini
(not found) server node
dcs3800u31b_lun3 0A62001C54235586 - - mminsd5.infini
(not found) server node
dcs3800u31b_lun5 0A62001B54235590 - - mminsd5.infini
(not found) server node
dcs3800u31b_lun5 0A62001B54235590 - - mminsd6.infini
(not found) server node
dcs3800u31b_lun7 0A62001C5423559A - - mminsd6.infini
(not found) server node
dcs3800u31b_lun7 0A62001C5423559A - - mminsd5.infini
(not found) server node
dcs3800u31b_lun9 0A62001B542355A4 - - mminsd5.infini
(not found) server node
dcs3800u31b_lun9 0A62001B542355A4 - - mminsd6.infini
(not found) server node
[root@mmmnsd5 ~]#
--
I'm wondering if somebody has seen this type of issue before? Will recreating
my NSDs destroy the filesystem? I'm thinking that all the data is intact, but
there is no crucial data on this file system yet, so I could recreate the file
system, but I would like to learn how to solve a problem like this. Thanks for
all help and information.
Regards,
Jared
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