Christian, Thanks for the feedback. I guess I'm wondering about step 4 "clobber partition, leaving data in tact and grow partition and the file system as needed". My understanding of xfs_growfs is that the free space must be at the end of the existing file system. In this case the existing partition starts around the 800GB mark on the disk and and extends to the end of the disk. My goal is to add the first 800GB on the disk to that partition so it can become a single data partition. Note that my volumes are not LVM based so I can't extend the volume by incorporating the free space at the start of the disk. Am I misunderstanding something about file system grow commands? Regarding your comments, on impact to the cluster of a downed OSD. I have lost OSDs and the impact is minimal (acceptable). My concern is around taking an OSD down, having the cluster initiate recovery and then bringing that same OSD back into the cluster in an empty state. Are the placement groups that originally had data on this OSD already remapped by this point (even if they aren't fully recovered) so that bring the empty, replacement OSD on-line simply causes a different set of placement groups to be mapped onto it to achieve the rebalance? Thanks, ~jpr On 09/16/2015 08:37 AM, Christian Balzer wrote: > Hello, > > On Wed, 16 Sep 2015 07:21:26 -0500 John-Paul Robinson wrote: > >> > The move journal, partition resize, grow file system approach would >> > work nicely if the spare capacity were at the end of the disk. >> > > That shouldn't matter, you can "safely" loose your journal in controlled > circumstances. > > This would also be an ideal time to put your journals on SSDs. ^o^ > > Roughly (you do have a test cluster, do you? Or at least try this with > just one OSD): > > 1. set noout just to be sure. > 2. stop the OSD > 3. "ceph-osd -i osdnum --flush-journal" for warm fuzzies (see man page or > --help) > 4. clobber your partitions in a way that leaves you with an intact data > partition, grow that and the FS in it as desired. > 5. re-init the journal with "ceph-osd -i osdnum --mkjournal" > 6. start the OSD and rejoice. > > More below. > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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