I inquired about this a while back and got the following: "In order to minimize downtime, it would also be possible to use the ext2 "dump" program in order to do device-level backups (including the extended attributes) while the filesystem is in use. This backup would not be 100% coherent with the actual filesystem.
The problem with running rsync to do the final sync step is that this has no understanding of extended attributes. For current (1.4.8) versions of Lustre the OST EAs are not required for the correct operation of the filesystem (they are redundant information to assist recovery in case of corruption), but in the future that may not be true." The (offline) method of migrating an OST is here: https://bugzilla.clusterfs.com/show_bug.cgi?id=4633 but after reading the above I guess you should probably run the getfattr/setfattr commands on the OSTs as well as the MDT. Stephen ----- "Stuart Midgley" <[EMAIL PROTECTED]> wrote: > Morning > > We have some failing hardware in an oss (md raid5 over 6 x 750GB sata > > disks) and I would like to migrate all the data off to a new oss. > This looks relatively straight forward enough, but can you do it semi- > > live? > > What I want to do is mount the lustre partition read only while it is > > still being served up and rsync the data off to a new oss (which will > > take ~24hrs). Then, bring the entire cluster down, do the last rsync > > (which will hopefully be fast), turn the old oss off and bring the > new replacement oss into the cluster. In this way, downtime will be > > minimised. > > Will this work? Has anybody tired such a scheme? > > Thanks. > > > -- > Dr Stuart Midgley > [EMAIL PROTECTED] > > > > _______________________________________________ > Lustre-discuss mailing list > [email protected] > https://mail.clusterfs.com/mailman/listinfo/lustre-discuss -- Stephen Willey Senior Systems Engineer Framestore CFC +44 (0)207 344 8000 http://www.framestore-cfc.com _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
