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 <[email protected]> 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 <[email protected]> > > 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 > > > [email protected] > > > 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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