Andreas, Out of sheer curiosity, I was wondering when the "lfs migrate" feature mentioned on the lustre arch wiki might show up :) I can't wait to add it to my lustre utility belt.
-Aaron On Dec 30, 2009, at 5:44 PM, Andreas Dilger wrote: > On 2009-12-29, at 19:33, Nick Jennings wrote: >> Hi Everyone, > > Hi Nick, > >> We've been using an MD1000 as our storage array for close to a year >> now, just hooked up to one OSS (LVM+ldiskfs). I recently ordered 2 >> more >> servers, one to be hooked up to the MD1000 to help distribute the >> load, >> the other to act as a lustre client (web node). >> >> The hosting company informs me that the MD1000 was never setup to >> operate in split mode (which I asked for in the beginning) so >> basically >> only one server can be connected to it. >> >> I now am faced with a tough call, we can't bring the filesystem down >> for any extended period of time (a few minutes is OK, though 0 >> downtime >> would be perfect!) and I'm not sure how to proceed in a way that would >> make things cause the least amount of headache. >> >> The only thing I can think of is to set up a second MD1000 (configured >> for split mode) connect it to OSS2 (the new one which is not yet being >> used), add it to the Lustre filesystem and then somehow migrate the >> data >> from OSS1 (old MD1000) to OSS2 (new MD1000) ... then, bring OSS1 >> offline, and connect it to the second partition of new MD1000 and >> bring >> that end online once more. > > There is a section in the manual about "manual data migration", which > should let you move the data. Note that this is not 100% transparent > to applications, but it is safe if you know either that files are > unused, or only open for reading. > > Cheers, Andreas > -- > Andreas Dilger > Sr. Staff Engineer, Lustre Group > Sun Microsystems of Canada, Inc. > > _______________________________________________ > Lustre-discuss mailing list > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
