On Mon, Oct 22, 2018, 6:55 PM solarflow99 <solarflow99@xxxxxxxxx> wrote:
Why didn't you just install the DB + WAL on the NVMe? Is this "data disk" still an ssd?On Mon, Oct 22, 2018 at 3:34 PM David Turner <drakonstein@xxxxxxxxx> wrote:And by the data disk I mean that I didn't specify a location for the DB partition._______________________________________________On Mon, Oct 22, 2018 at 4:06 PM David Turner <drakonstein@xxxxxxxxx> wrote:Track down where it says they point to? Does it match what you expect? It does for me. I have my DB on my data disk and my WAL on a separate NVMe.On Mon, Oct 22, 2018 at 3:21 PM Robert Stanford <rstanford8896@xxxxxxxxx> wrote:David - is it ensured that wal and db both live where the symlink block.db points? I assumed that was a symlink for the db, but necessarily for the wal, because it can live in a place different than the db.On Mon, Oct 22, 2018 at 2:18 PM David Turner <drakonstein@xxxxxxxxx> wrote: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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