Thank you Igor for the response. So do I need to use this,
ceph-deploy osd create --debug --bluestore --data /dev/sdb --block-wal /dev/nvme0n1p1 --block-db /dev/nvme0n1p2 cephdatahost1 or ceph-deploy osd create --debug --bluestore --data /dev/sdb --block-db /dev/nvme0n1p2 cephdatahost1 where /dev/sdb is ssd disk for osd /dev/nvmen0n1p1 is 10G partition /dev/nvme0n1p2 is 25G partition Thanks, Pardhiv K On Wed, Jun 27, 2018 at 9:08 AM Igor Fedotov <ifedo...@suse.de> wrote: > Hi Pardhiv, > > there is no WalDB in Ceph. > > It's WAL (Write Ahead Log) that is a way to ensure write safety in > RocksDB. In other words - that's just a RocksDB subsystem which can use > separate volume though. > > In general For BlueStore/BlueFS one can either allocate separate volumes > for WAL and DB or have them on the same volume. The latter is the common > option. > > The separated layout makes sense when you have tiny but super-fast device > (for WAL) and less effective (but still fast) larger drive for DB. Not to > mention the third one for user data.... > > E.g. HDD (user data) + SDD (DB) + NVME (WAL) is such a layout. > > > So for you case IMO it's optimal to have merged WAL+DB at NVME and data at > SSD. Hence no need for separate WAL volume. > > > Regards, > > Igor > > On 6/26/2018 10:22 PM, Pardhiv Karri wrote: > > Hi, > > I am playing with Ceph Luminous and getting confused information around > usage of WalDB vs RocksDB. > > I have 2TB NVMe drive which I want to use for Wal/Rocks DB and have 5 2TB > SSD's for OSD. > I am planning to create 5 30GB partitions for RocksDB on NVMe drive, do I > need to create partitions of WalDB also on NVMe drive or does RocksDB does > same work as WalDB plus having metadata on it? > > So my question is do I really need to use WalDB along with RocksDB or > having RocksDB only is fine? > > Thanks, > Pardhiv K > > > > > > _______________________________________________ > ceph-users mailing > listceph-us...@lists.ceph.comhttp://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 > -- *Pardhiv Karri* "Rise and Rise again until LAMBS become LIONS"
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