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 <[email protected]> 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 <[email protected]> > 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 <[email protected]> >> 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" <[email protected]> >>> > To: "ceph-users" <[email protected]> >>> > 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 >>> > >>> > >>> > _______________________________________________ >>> > ceph-users mailing list [ mailto:[email protected] | >>> [email protected] ] [ >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com | >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ] >>> > >>> > you should put wal on the faster device, wal and db could share the >>> same ssd partition, >>> > >>> > Maged >>> > >>> > _______________________________________________ >>> > ceph-users mailing list >>> > [email protected] >>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> > _______________________________________________ >>> > ceph-users mailing list >>> > [email protected] >>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >>> _______________________________________________ >>> ceph-users mailing list >>> [email protected] >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> _______________________________________________ >> ceph-users mailing list >> [email protected] >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >
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