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
