[ceph-users] Drive for Wal and Db

Maged Mokhtar mmokhtar at petasan.org
Mon Oct 22 03:22:00 PDT 2018


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 at petasan.org>
> To: "ceph-users" <ceph-users at lists.ceph.com>
> Sent: Saturday, 20 October, 2018 20:05:44
> Subject: Re: [ceph-users] 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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