[Gluster-users] Node Failure

[Michael Messig]

Thankyou for your reply!

Pointing out the extended attributes use, this put us at ease as to 
gluster doing the right thing with older files.

Chris Davies also pointed out:

--
If you have clientside AFR on, as you request files from the mounted 
volume, if they are not on both machines, the namespace will 
automatically repopulate the other machine.

http://www.gluster.org/docs/index.php/Understanding_AFR_Translator

On that page, you can see a way to force a self-heal with

$ find /mnt/glusterfs -type f -print0 | xargs -0 head -c1 >/dev/null


which is listed about 1/3 of the way down the page.

--

We went ahead and everything ran smoothly. The configuration changes 
were only to make sure the right bricks were accessed by the clients 
(copying the vm with a new IP required this change).

Thanks again for your help!

Raghavendra G wrote:
> Hi michael,
> some are inlined.
>
> On Mon, Aug 11 2008 at 5:29 AM, Michael Messig 
> <michael.messig at sitepoint.com <mailto:michael.messig at sitepoint.com>> 
> wrote:
>
>     Hi Guys,
>
>     I have two nodes set up using afr. Overnight the first machine
>     died and
>     i've had to rebuild it based on a copy of the second machine (they are
>     both vm's).
>
>
> after  rebuild,  are the both nodes identical? If so, did you set 
> extended attributes appropriately for the files you repaired or 
> created (afr uses extended attributes to synchronise files/directories 
> b/w its children).
>
>     Is there anything bad that will happen if I start the
>     rebuilt first machine (i've changed the configuration accordingly)? 
>
>
> Did you change the glusterfs configuration? If so, can you send the 
> configuration files before and after the failure?
>  
>
>     I.e
>     will gluster just pick up on its merry way, get all the updates
>     from the
>     second machine that have occured since the copy and not destroy the
>     filesystem?
>
>     Thanks!
>
>     Mike
>
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>
>
>
> -- 
> Raghavendra G
>
> A centipede was happy quite, until a toad in fun,
> Said, "Prey, which leg comes after which?",
> This raised his doubts to such a pitch,
> He fell flat into the ditch,
> Not knowing how to run.
> -Anonymous