On Friday 08 June 2007 13:41:13 Thomas Roth wrote: > Hi, > > I'm quite new to lustre, studying all the documentation. A question I > have not found an answer to so far: > > If the user data gets spread out in chunks to a number of OSTs, and one > of the OSTs fails completely - say, all the disks on the fileserver > behind that OST are gone for good - how does the cluster recover from that? > > It can't be a backup replay from tape or keeping all fileservers as HA > pairs, right? Is lustre doing some kind of RAID accross the OSTs? And > where can I find some documentation on that?
Well, I think thats one of the weaknesses of lustre, it doesn't support raid over the OSTs :( I asked Peter Braahm during the LUG about it and he told me its planned for 2008 (not sure anymore, if the year anymore). Peter also suggested to use something like nbd devices. Well, raid5 over enbd probably would work, but afaik enbd development has stalled and I don't off know any better nbd (imho the kernel build-in nbd is by far too unstable for that purpose). Cheers, Bernd -- Bernd Schubert Q-Leap Networks GmbH _______________________________________________ Lustre-discuss mailing list Lustre-discuss@clusterfs.com https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
