* pNFS client behavior confirmation
[not found] <1749916670.2570521.1402503768494.JavaMail.zimbra@desy.de>
@ 2014-06-11 16:33 ` Mkrtchyan, Tigran
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From: Mkrtchyan, Tigran @ 2014-06-11 16:33 UTC (permalink / raw)
To: Linux Kernel mailing list; +Cc: Andy Adamson, Steve Dickson
Dear pnfs developers,
I would like to confirm client behavior which was hurting us for years.
If for some reason the client is unable to connect to a DS, then this DS got blacklisted
and the only way to whitelist it again was client reboot. With RHEL7 (and I believe with
upstream kernel), after 2 mins client 'forgets' about bad DS and uses it again. This
behavior is tested and confirmed during June bakeathon.
Missing bits:
i) it takes client 6 min to fall back to MDS, e.g time between LAYOUTGET and first WRITE to MDS
ii) there are no log entries why client have decided to use MDS
Thanks,
Tigran.
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2014-06-11 16:33 ` pNFS client behavior confirmation Mkrtchyan, Tigran
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