Dear group, I would like to test combination MGS/MDT on a node and OSS/OST on another node, MGS/MDT has multiple file system name such as - wwwfs - mailfs - homefs etc. How do I use mkfs.lustre on MGS/MDT node ? Thank you.
Nont Banditwong wrote:> Dear group, > I would like to test combination MGS/MDT on a node and OSS/OST on > another node, MGS/MDT has multiple file system name such as > - wwwfs > - mailfs > - homefs > > etc. > > How do I use mkfs.lustre on MGS/MDT node ?There is only 1 filesystem per MDT. So you can either organize your files under a single tree, or you will need three MDTs. In the latter case, you probably only want one of them to be an MGS, so specify --mdt --mgs on one, and --mdt --mgsnode=<mgsnodenid> on the others.
Nont Banditwong wrote:>> There is only 1 filesystem per MDT. So you can either organize your >> files under a single >> tree, or you will need three MDTs. In the latter case, you probably >> only want one of them to >> be an MGS, so specify --mdt --mgs on one, and --mdt >> --mgsnode=<mgsnodenid> on the others. > > Thank Nathaniel, > >> From your reply I understand that Lustre can has 1 MDT per node right ? > If I want to have 3 file system as I mention before I must setup > 1 node for MGS/ 1MDT and 2 nodes for 2 MDTs (1 MDT on each node) . > Please correct me If I wrong.Well, those are sufficient but not necessary conditions. If you substitute "disk" for "node" you would be more accurate. And you could set up 1 disk for a standalone MGS and 3 disks for 3 MDTs if you wanted. The MGS disk can be small; it just needs to hold configuration data.
Sorry, I forget CC to lustre-discuss again.> Well, those are sufficient but not necessary conditions. If you > substitute "disk" for > "node" you would be more accurate. And you could set up 1 disk for a > standalone MGS and 3 disks for 3 MDTs if you wanted. The MGS disk can be small; it > just needs to hold configuration data.Can''t it be "partition" instead of "disk" ? Thank for your help Nathaniel.
Nont Banditwong wrote:>> Well, those are sufficient but not necessary conditions. If you >> substitute "disk" for "node" you would be more accurate. And you >> could set up 1 disk for a >> standalone MGS and 3 disks for 3 MDTs if you wanted. The MGS disk >> can be small; it >> just needs to hold configuration data. > > Can''t it be "partition" instead of "disk" ? > > Thank for your help Nathaniel. >yes, although since you''re sharing a spindle your performance won''t be as good.