You can't have multiple MGTs on a single node, but you can share a single MGT between multiple filesystems.
Having a separate MGT from the MDTs is best if there are multiple filesystems, since it allows you to start/stop the MGS independently of the MDTs. It is possible to use a shared MGT/MDT with multiple filesystems, and use the "mount -t lustre -o nosvc" option to start/stop only the MGS service and not the MDS, but that is inconvenient and should be avoided if you are setting up a new filesystem. Cheers, Andreas > On Jan 3, 2019, at 22:45, ANS <ans3...@gmail.com> wrote: > > I think you can create multiple file systems with mgs on single block device > with multiple partitions but there may be performance degradation. > > Try creating and run ior on both file systems individually and at a time. > > Rgds, > ANS > > On Fri, Jan 4, 2019 at 2:50 AM <lustre-discuss-requ...@lists.lustre.org> > wrote: > Send lustre-discuss mailing list submissions to > lustre-discuss@lists.lustre.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org > or, via email, send a message with subject or body 'help' to > lustre-discuss-requ...@lists.lustre.org > > You can reach the person managing the list at > lustre-discuss-ow...@lists.lustre.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of lustre-discuss digest..." > > > Today's Topics: > > 1. multiple filesystem creation problem (Jae-Hyuck Kwak) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 3 Jan 2019 11:57:02 +0900 > From: Jae-Hyuck Kwak <jhk...@kisti.re.kr> > To: lustre-discuss@lists.lustre.org > Subject: [lustre-discuss] multiple filesystem creation problem > Message-ID: <7b64f8a0-a5f5-faeb-671e-2c3c3f8b6...@kisti.re.kr> > Content-Type: text/plain; charset=euc-kr; format=flowed > > Hi, all, > I would like to create multiple lustre filesystem. in this case, should > mgs be on its own dedicated block device? > I used to create a combined mgs/mdt filesystem on the block device. is > it possible to multiple combined mgs/mdt filesystem as following? > # mkfs.lustre --fsname=test0 --mdt --mgs --index=0 --reformat /dev/sdc > # mkfs.lustre --fsname=test1 --mdt --mgs --index=1 --reformat /dev/sdd > # mkdir -p /mnt/test0/mdt0 > # mkdir -p /mnt/test1/mdt1 > # mount -t lustre /dev/sdc /mnt/test0/mdt0 > # mount -t lustre /dev/sdd /mnt/test1/mdt1 > > BR, > Jae-Hyuck > > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > lustre-discuss mailing list > lustre-discuss@lists.lustre.org > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org > > > ------------------------------ > > End of lustre-discuss Digest, Vol 154, Issue 3 > ********************************************** > > > -- > Thanks, > ANS. > _______________________________________________ > lustre-discuss mailing list > lustre-discuss@lists.lustre.org > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org Cheers, Andreas --- Andreas Dilger CTO Whamcloud _______________________________________________ lustre-discuss mailing list lustre-discuss@lists.lustre.org http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
