On 08/15/2018 05:57 PM, Robert Stanford wrote: > > Thank you Wido. I don't want to make any assumptions so let me verify, > that's 10GB of DB per 1TB storage on that OSD alone, right? So if I > have 4 OSDs sharing the same SSD journal, each 1TB, there are 4 10 GB DB > partitions for each? >
Yes, that is correct. Each OSD needs 10GB/1TB of storage of DB. So size your SSD according to your storage needs. However, it depends on the workload if you need to offload WAL+DB to a SSD. What is the workload? Wido > On Wed, Aug 15, 2018 at 1:59 AM, Wido den Hollander <w...@42on.com > <mailto:w...@42on.com>> wrote: > > > > On 08/15/2018 04:17 AM, Robert Stanford wrote: > > I am keeping the wal and db for a ceph cluster on an SSD. I am using > > the masif_bluestore_block_db_size / masif_bluestore_block_wal_size > > parameters in ceph.conf to specify how big they should be. Should these > > values be the same, or should one be much larger than the other? > > > > This has been answered multiple times on this mailinglist in the last > months, a bit of searching would have helped. > > Nevertheless, 1GB for the WAL is sufficient and then allocate about 10GB > of DB per TB of storage. That should be enough in most use cases. > > Now, if you can spare more DB space, do so! > > Wido > > > R > > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com> > > > > _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
