Re: SSD Sizing for DB/WAL: 4% for large drives?

[Konstantin Shalygin <k0ste@xxxxxxxx>]

Dear All,

Quick question regarding SSD sizing for a DB/WAL...

I understand 4% is generally recommended for a DB/WAL.

Does this 4% continue for "large" 12TB drives, or can we  economise and
use a smaller DB/WAL?

Ideally I'd fit a smaller drive providing a 266GB DB/WAL per 12TB OSD,
rather than 480GB. i.e. 2.2% rather than 4%.

Will "bad things" happen as the OSD fills with a smaller DB/WAL?

By the way the cluster will mainly be providing CephFS, fairly large
files, and will use erasure encoding.

many thanks for any advice,

Jake

block.db should be 30Gb or 300Gb - anything between is pointless. There is described why: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2019-February/033286.html

This "4%" mean nothing actually.

k

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