2018-03-21 7:20 GMT+01:00 ST Wong (ITSC) <s...@itsc.cuhk.edu.hk>: > Hi all, > > > > We got some decommissioned servers from other projects for setting up > OSDs. They’ve 10 2TB SAS disks with 4 2TB SSD. > > We try to test with bluestores and hope to play wal and db devices on > SSD. Need advice on some newbie questions: > > > > 1. As there are more SAS than SSD, is it possible/recommended to put wal > and db of multiple OSDs in partitions on same SSD (instead of using whole > SSD device) ? > > Yes, that's common practice. Although the general advice is no more then 5 OSD's per wal/db SSD.
> 2. if ok to do 1., how to size the SSD partition for wal/db ? > ~ 10GB per TB. In your case 20GB partitions for 2TB drives. > 3. do we need to tune parameters like bluestore_cache_size_ssd when SSD > is used in OSD? > > > Only if your low on RAM. Caspar Thanks a lot. > > Best Regards, > > /ST Wong > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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