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

[Alexander Oltu]

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