[Lustre-discuss] 184.108.40.206 <-> 1.6.6
t.roth at gsi.de
Thu Jan 8 07:17:58 PST 2009
thanks for your explanation of writeconf.
Of course, the man pages as well as the Lustre manual state that
writeconf is a potentially dangerous operation.
I'm always afraid to manipulate the MDT: might go wrong and I end up
with 100's of TB of junk (as a restore of backups never works once you
But if it's harmless to run writeconf as you said, I will try...
Wojciech Turek wrote:
> 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.
> 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.
> 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.
> Jerome, Ron wrote:
>> 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.
>>> -----Original Message-----
>>> From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-
>>> bounces at lists.lustre.org] On Behalf Of Jakob Goldbach
>>> Sent: January 7, 2009 9:41 AM
>>> To: lustre-discuss
>>> Subject: [Lustre-discuss] 220.127.116.11 <-> 1.6.6
>>> The manual says I need to
>>> tunefs.lustre --mgs --writeconf ...
>>> when upgrading from 18.104.22.168 to 1.6.6.
>>> Whats happens if I want to downgrade to 22.214.171.124 again ?
>>> I come from 126.96.36.199 - does that make a difference ?
>>> Lustre-discuss mailing list
>>> Lustre-discuss at lists.lustre.org
>> Lustre-discuss mailing list
>> Lustre-discuss at lists.lustre.org
> Wojciech Turek
> Assistant System Manager
> High Performance Computing Service
> University of Cambridge
> Email: wjt27 at cam.ac.uk
> Tel: (+)44 1223 763517
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
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