[ceph-users] Drive for Wal and Db

Robert Stanford rstanford8896 at gmail.com
Mon Oct 22 09:29:35 PDT 2018


 That's what they say, however I did exactly this and my cluster
utilization is higher than the total pool utilization by about the number
of OSDs * wal size.  I want to verify that the wal is on the SSDs too but
I've asked here and no one seems to know a way to verify this.  Do you?

 Thank you, R

On Mon, Oct 22, 2018 at 5:22 AM Maged Mokhtar <mmokhtar at petasan.org> wrote:

>
> 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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