whenever an access to a NSD happens, there is a potential that the node cannot access the disk, so if the (only) NSD server is down, there will be no chance to access the disk, and the disk will be set down.
If you have twintailed disks, the 'second' (or possibly some more) NSD server will be asked, switching to networked access, and in that case only if that also fails, the disk will be set to down as well.
Not sure how your setup is, but if you reboot 2 NSD servers, and some client possibly did IO to a file served by just these 2, then the 'down' state would be explainable.
Rebooting of an NSD server should never set a disk to down, except, he was the only one serving that NSD.
Mit freundlichen Grüßen / Kind regards
Achim Rehor
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From:
"Grunenberg, Renar"
<renar.grunenb...@huk-coburg.de>
To:
"'gpfsug-discuss@spectrumscale.org'"
<gpfsug-discuss@spectrumscale.org>
Date:
12/07/2018 10:17
Subject:
[gpfsug-discuss]
Analyse steps if disk are down after reboot
Sent by:
gpfsug-discuss-boun...@spectrumscale.org
Hallo All,
we see after a reboot of two NSD-Servers some disks in different filesystems are down and we don’t see why.
The logs (messages, dmesg, kern,..) are saying nothing. We are on Rhel7.4 and SS 5.0.1.1.
The question now, there are any log, structures in the gpfs deamon that log these situation? What was the reason why the deamon hast no access to the disks at that startup phase.
Any hints are appreciated.
Renar Grunenberg
Abteilung Informatik – Betrieb
HUK-COBURG
Bahnhofsplatz
96444 Coburg
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