You can always just go to /var/lib/ceph/osd/ceph-{osd-num}/ and look at where the symlinks for block and block.wal point to.
On Mon, Oct 22, 2018 at 12:29 PM Robert Stanford <rstanford8896@xxxxxxxxx> wrote:
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@xxxxxxxxxxx> 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@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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