On Nov 18, 2007 20:48 -0500, Charles Taylor wrote: > If a site has multiple Lustre file systems, the documentation implies > that there only needs to be a single MGS for an entire site > (regardless of the number of file systems). However, I also know > it is fairly common to have a combined MGS/MDT. So here are the > questions. > > 1. If we are going to have several Lustre file systems, is there any > reason not to create each one with its own combined MGS/MDT?
Not that I'm aware of, with the restriction that you can only have a single MGS running on a node at a time. If you have failover MDSes, then they need to share an MGS. > 2. Can an MGS which is a combined MGS/MDT for one file system serve > as the MGS for one or more other file systems where the MGS and MDT > are separate? It's possible, but seems klunky... It means the combined MGS/MDT needs to be started to also start the other filesystems. > 3. Is there any reason why doing several separate combined MGS/MDTs > (one for each file system) won't work? See above. > What are other sites w/ multiple Lustre file systems doing? A > dedicated MGS seems like a costly option. A dedicated MGS doesn't mean a wholly separate node. It might just be a small partition shared among a few failover nodes. Cheers, Andreas -- Andreas Dilger Sr. Software Engineer, Lustre Group Sun Microsystems of Canada, Inc. _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
