So your new MDT volume had the same size as the old one? You didn't have to resize?
Would be interesting to know if someone has experience with resize2fs applied to a MDT ... Cheers, Thomas On 02/03/2011 06:35 PM, Bob Ball wrote: > We used dd. It took about 12 hours. After the dd, we did an e2fsck on > the new volume, remounted it as the MDT, and Lustre happily began > serving files again. > > Thanks to everyone for their help. > > bob > > On 2/3/2011 12:21 PM, Frederik Ferner wrote: >> Bob Ball wrote: >>> Is there a recommended way to migrate an MDT (MGS is separate) volume >>> from one location to another on the same server? This uses iSCSI volumes. >>> >>> Lustre 1.8.4 >> We have recently migrated our MDT to an new volume to change the inode >> size. We used tar and getfattr/setfattr for this closely following the >> MDT backup and restore procedure from the manual. We did take our file >> system down completely for over a week over Christmas to do this, though >> it could have possibly been quicker if we had not taken time off as >> well. We also did very careful checking of everything before bringing up >> the new MDT. This was on a file system with at that time about 90M files. >> >> Be sure to use a tar version that has an efficient way to detect files >> that are completely sparse. We found that the version on RHEL5 did not >> have this and taking backups took very long, I think there is a thread >> on the list about this which has a link to a fixed tar version for RHEL5 >> which we used in the end. Also, we did not use any --posix or --xattr >> option for tar as we found that this is broken and creates bogus files. >> We used plain 'tar --sparse'. >> >> If you don't have to change any mkfs options (like inode size in our >> case), I suspect any block based copy mechanism like dd or pvmove is the >> better option, possibly followed by a resize. >> >> Good luck, >> Frederik >> > _______________________________________________ > Lustre-discuss mailing list > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss -- -------------------------------------------------------------------- Thomas Roth Department: Informationstechnologie Location: SB3 1.262 Phone: +49-6159-71 1453 Fax: +49-6159-71 2986 GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstraße 1 64291 Darmstadt www.gsi.de Gesellschaft mit beschränkter Haftung Sitz der Gesellschaft: Darmstadt Handelsregister: Amtsgericht Darmstadt, HRB 1528 Geschäftsführung: Professor Dr. Dr. h.c. Horst Stöcker, Dr. Hartmut Eickhoff Vorsitzende des Aufsichtsrates: Dr. Beatrix Vierkorn-Rudolph Stellvertreter: Ministerialdirigent Dr. Rolf Bernhardt _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
