Linux NFS development
 help / color / mirror / Atom feed
From: "Mkrtchyan, Tigran" <tigran.mkrtchyan@desy.de>
To: linux-nfs@vger.kernel.org
Subject: pNFS client behavior confirmation
Date: Wed, 11 Jun 2014 20:30:43 +0200 (CEST)	[thread overview]
Message-ID: <378787782.2570868.1402511443819.JavaMail.zimbra@desy.de> (raw)
In-Reply-To: <955256583.2570604.1402504421889.JavaMail.zimbra@desy.de>




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.

           reply	other threads:[~2014-06-11 18:39 UTC|newest]

Thread overview: expand[flat|nested]  mbox.gz  Atom feed
 [parent not found: <955256583.2570604.1402504421889.JavaMail.zimbra@desy.de>]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=378787782.2570868.1402511443819.JavaMail.zimbra@desy.de \
    --to=tigran.mkrtchyan@desy.de \
    --cc=linux-nfs@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox