Ceph OSD db and wal size

[Gabor]

Hello Guys!

I have a big question for the ceph cluster and I need your help or your opinion.

I installed a simple 3 nodes setup with Ceph.
In one node has 2x146 GB HW RAID 1 + 18x 600 GB 10k SAS without RAID.
(Summary we have 54 OSD device and we have to buy 3 SSD for journal)

And my big question for the DB and WAL partition size. I don't know how about this, or can we separate two another partition ...

How can calculate this partition size ? What is the official value for this ?

I think I'll add 10GB db partition and 1 GB wal partition each OSD disk. What do you think ?

Many thanks!

Best,
G.

 

[wolfgang]

Hi,
4% of the data raw size.
see https://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/#sizing

 

[Alwin]

I think I'll add 10GB db partition and 1 GB wal partition each OSD disk. What do you think ?

In addition to @wolfgang 's answer. The WAL lives with the DB together, if not specified otherwise.