[Lustre-discuss] OSS and MDS resilience to power failures

[Wojciech Turek]

In that case just make sure that RAID controller cache coherency is
enabled, that is if you have shared storage with redundant controllers.

Wojciech

On 13 January 2012 12:04, Alexander Oltu <Alexander.Oltu at uni.no> wrote:

> Wojciech, thanks! I forgot to mention that our disk storage will be on
> UPS.
>
> Alex.
>
> On Fri, 13 Jan 2012 11:13:08 +0000
> Wojciech Turek wrote:
>
> > Make sure that use use RAID controller's with cache protected by
> > battery backup and if you use redundant controllers that the cache
> > mirroring feature is enabled. The ldiskfs (ext4) should recover after
> > power failures with no problems as long as the back end storage
> > recovers fine too.
> >
> > Best regards,
> >
> > Wojciech
> >
> > On 13 January 2012 11:01, Alexander Oltu <Alexander.Oltu at uni.no>
> > wrote:
> >
> > > Hi,
> > >
> > > We are going to have a Lustre setup with around 1000 clients. Due
> > > to a power cable constraints we are not able to provide power to
> > > OSS and MDS servers from UPS.
> > >
> > > Therefore the question is how resilient is Lustre to OSS and/or MDS
> > > power failures?
> > >
> > > We have quite few thunderstorms here during summer with short power
> > > interruptions. I understand that ext4 is a journaling filesystem and
> > > should be more or less stable to power interruptions. But the real
> > > practice can be different. I believe that some of you have
> > > experience of running OSS and MDS without UPS and can shed some
> > > light on this topic.
> > >
> > > Thank you,
> > > Alex.
> > > _______________________________________________
> > > Lustre-discuss mailing list
> > > Lustre-discuss at lists.lustre.org
> > > http://lists.lustre.org/mailman/listinfo/lustre-discuss
> > >
>
>
> --
> Alexander Oltu
> System Engineer
> Parallab, Uni Computing
>
> HIB, Thormøhlensgt.55
> N-5008 Bergen, Norway
> phone: +47 55584144
>
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