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writeconf forces all the lustre targets (OSTs and MDTs) to fetch fresh
lustre configuration logs from MGS. Therefore it is not critical if you
don't run it when upgrading lustre because most of the time your lustre
configuration won't change and everything will work seamlessly. However
it is been considered as best practice to run writeconf on all lustre
targets when upgrading. Some times new version of lustre may introduce
some new features to the lustre configuration which won't be picked up
correctly until one rewrite the configuration using writeconf.<br>
<br>
I think that when upgrading from lustre 1.6.4 to 1.6.5 or 1.6.6 one
need to run writeconf in order to use new quota format introduced with
lustre version 1.6.5, please correct me if I am wrong.<br>
<br>
I would recommend to run writeconf on occasion of lustre upgrade as it
is harmless and helps avoid problems that may arise in the future.<br>
<br>
Cheers,<br>
<br>
Wojciech<br>
<br>
<br>
<br>
Jerome, Ron wrote:
<blockquote
cite="mid:48FCD4241C734E49A90D0FEFD6559D936AEC2C@nrccenexb2.nrc.ca"
type="cite">
<pre wrap="">For what it's worth, I've upgraded through every version of the Lustre
1.6.x series starting at 1.6.0 and now running 1.6.6 on a production
cluster (32TB in size with 5 OSS's 15 OST's and one MDS/MDT) and I have
never once ran tunefs.luster.... during the upgrade process.
Ron Jerome
National Research Council Canada.
</pre>
<blockquote type="cite">
<pre wrap="">-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:lustre-discuss-bounces@lists.lustre.org">lustre-discuss-bounces@lists.lustre.org</a> [<a class="moz-txt-link-freetext" href="mailto:lustre-discuss">mailto:lustre-discuss</a>-
<a class="moz-txt-link-abbreviated" href="mailto:bounces@lists.lustre.org">bounces@lists.lustre.org</a>] On Behalf Of Jakob Goldbach
Sent: January 7, 2009 9:41 AM
To: lustre-discuss
Subject: [Lustre-discuss] 1.6.5.1 <-> 1.6.6
Hi,
The manual says I need to
tunefs.lustre --mgs --writeconf ...
when upgrading from 1.6.5.1 to 1.6.6.
Whats happens if I want to downgrade to 1.6.5.1 again ?
I come from 1.6.4.3 - does that make a difference ?
Thanks
/Jakob
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</blockquote>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Wojciech Turek
Assistant System Manager
High Performance Computing Service
University of Cambridge
Email: <a class="moz-txt-link-abbreviated" href="mailto:wjt27@cam.ac.uk">wjt27@cam.ac.uk</a>
Tel: (+)44 1223 763517
</pre>
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