Re: Drive for Wal and Db

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If you specify a db on ssd and data on hdd and not explicitly specify a device for wal, wal will be placed on same ssd partition with db. Placing only wal on ssd or creating separate devices for wal and db are less common setups.

/Maged

On 22/10/18 09:03, Fyodor Ustinov wrote:
Hi!

For sharing SSD between WAL and DB what should be placed on SSD? WAL or DB?

----- Original Message -----
From: "Maged Mokhtar" <mmokhtar@xxxxxxxxxxx>
To: "ceph-users" <ceph-users@xxxxxxxxxxxxxx>
Sent: Saturday, 20 October, 2018 20:05:44
Subject: Re:  Drive for Wal and Db

On 20/10/18 18:57, Robert Stanford wrote:




Our OSDs are BlueStore and are on regular hard drives. Each OSD has a partition on an SSD for its DB. Wal is on the regular hard drives. Should I move the wal to share the SSD with the DB?

Regards
R


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you should put wal on the faster device, wal and db could share the same ssd partition,

Maged

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