Lustre discuss - Nov 2008 - Upgrading from 1.6.3 to 1.6.4 needs --writeconf

In the Lustre manual, http://dlc.sun.com/pdf/820-3681/820-3681.pdf,
section 13.3 is titled "Upgrading Lustre from 1.6.3 to 1.6.4".  Step 6
is:

 

     tunefs.lustre --mgs --writeconf --mgs --mdt --fsname=sunfs /dev/sdb

 

What is the purpose of the --writeconf?

 

Is this needed to do other upgrades, say from 1.6.4.3 to 1.6.5 or to
1.6.6?

 

If it is only needed for the upgrade from 1.6.3 to 1.6.4, can someone
please update the manual to say this?

Thanks.

 

Roger Spellman

Staff Engineer

Terascala, Inc.

508-588-1501

www.terascala.com http://www.terascala.com/

 

 

 

 

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--writeconf deletes config logs from the given object storage device.
I can not tell you for sure if this is mandatory to run when upgrading 
lustre but I can tell you that it will bring your lustre to sane state 
before starting it again after upgrade. You have to run --writeconf on 
all object storage devices for given filesystem. Next time you mount 
your object storage devices they will detect that they have no config 
logs and they will obtain them from the MGS therefore the configuration 
will be consistent on all the object storage devices.


Roger Spellman wrote:
>
> In the Lustre manual, http://dlc.sun.com/pdf/820-3681/820-3681.pdf, 
> section 13.3 is titled ?Upgrading Lustre from 1.6.3 to 1.6.4?. Step 6 is:
>
> tunefs.lustre --mgs --writeconf --mgs --mdt --fsname=sunfs /dev/sdb
>
> What is the purpose of the --writeconf?
>
> Is this needed to do other upgrades, say from 1.6.4.3 to 1.6.5 or to 
> 1.6.6?
>
> If it is only needed for the upgrade from 1.6.3 to 1.6.4, can someone 
> please update the manual to say this?
>
> Thanks.
>
> Roger Spellman
>
> Staff Engineer
>
> Terascala, Inc.
>
> 508-588-1501
>
> www.terascala.com http://www.terascala.com/
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>   
-- 
Wojciech Turek

Assistant System Manager
High Performance Computing Service
University of Cambridge
Email: wjt27 at cam.ac.uk
Tel: (+)44 1223 763517