Create R/O BeeGFS filesystem from ZFS snapshots ?

[Jens Dreger]

Hi!

I'm trying to assemble a working BeeGFS instance from ZFS snapshots of
meta and storage nodes. Is this something that can actually work or is
it technically impossible for some reason? I didn't get it working so
far so I thought I'd better ask...

Thanks for any hints,

Jens.

--
Jens Dreger Freie Universitaet Berlin
dre...@physik.fu-berlin.de Fachbereich Physik - ZEDV
Tel: +49 30 83854774 Arnimallee 14
Fax: +49 30 838454774 14195 Berlin

[Michael Ruepp]

You must halt all server daemons (storage/meta) before you take the snapshot. Then it should be possible to transfer or reinstate the beegfs from the snapshots. 

But there are also the files from the stalled clients (if there are open files) so you definitely have to run a fsck

Mit freundlichen Grüssen/Best regards,

Michael Ruepp, BA

_________________

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fon +43 676 911 40 90

skype michaelruepp

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[Jens Dreger]

On Mon, Sep 12, 2016 at 05:09:21PM +0200, Michael Ruepp wrote:
> You must halt all server daemons (storage/meta) before you take the snapshot.
> Then it should be possible to transfer or reinstate the beegfs from the
> snapshots.
>
> But there are also the files from the stalled clients (if there are open files)
> so you definitely have to run a fsck

I got it working now. My problem was not taking the snapshots but I
missed some small things when putting them back together. Now I have
eight beegfs instances, the primary r/w and one r/o snapshot for every
day of the week. Very nice, I'm happy :)

Regards,

Jens.

[Sven Breuner]

Hi Jens,

thanks for sharing this information, I'm glad to hear it works now. If you have
anything more to share like maybe a script or a description of the steps or how
you set things up (e.g. if the problem that you mentioned for putting the
snapshots back together could also happen to other people trying the same), I'm
sure that a lot of people here would find that very interesting.

Best regards,
Sven

Jens Dreger wrote on 14.09.2016 08:55:
> On Mon, Sep 12, 2016 at 05:09:21PM +0200, Michael Ruepp wrote:
>> You must halt all server daemons (storage/meta) before you take the snapshot.
>> Then it should be possible to transfer or reinstate the beegfs from the
>> snapshots.
>>
>> But there are also the files from the stalled clients (if there are open files)
>> so you definitely have to run a fsck
>
> I got it working now. My problem was not taking the snapshots but I
> missed some small things when putting them back together. Now I have
> eight beegfs instances, the primary r/w and one r/o snapshot for every
> day of the week. Very nice, I'm happy :)
>
> Regards,
>
> Jens.
>
>>
>> Mit freundlichen Grüssen/Best regards,
>>
>>
>> Michael Ruepp, BA
>>
>> _________________
>>
>> mic...@ruepp.at
>>
>> fon +43 676 911 40 90
>>
>> skype michaelruepp
>>