On 2010-08-18, at 13:14, Kevin Van Maren wrote: > David Noriega wrote: >> But ultimately if I wanted two separate filesystems, I would need more >> hardware? An OST can't be put into a general 'pool' for use between >> the two? > > You probably don't need more hardware, but you would have to decide > which file system each OST would serve -- it can only provide space to one > file system. So some of your OSTs would be for home and some for groups. > You would need to have 2 MDTs (if necessary, you could split/partition the > MDT you have).
To clarify, it is NOT possible to have an OST in more than one filesystem, but it IS possible to have multiple OSTs (RAID LUNs + ldiskfs filesystem) on the same OSS node exported to different Lustre filesystems. That said, this isn't a very common configuration except in the smallest of installations, since you now have a single point of failure for BOTH filesystems, and there is little value in e.g. sharing /home and /groups both across the same 10 OSS nodes, instead of having 4 OSS nodes for /home and 6 separate OSS nodes for /groups (or whatever split is needed for your usage). For a small configuration it probably makes sense to share the space in a single filesystem as Kevin suggested. Cheers, Andreas -- Andreas Dilger Lustre Technical Lead Oracle Corporation Canada Inc. _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
