[ceph-users] Verifying the location of the wal

ceph at elchaka.de ceph at elchaka.de
Sun Oct 28 11:48:38 PDT 2018


IIRC there is a Command like 

Ceph osd Metadata

Where you should be able to find Information like this

Hab
- Mehmet 

Am 21. Oktober 2018 19:39:58 MESZ schrieb Robert Stanford <rstanford8896 at gmail.com>:
> I did exactly this when creating my osds, and found that my total
>utilization is about the same as the sum of the utilization of the
>pools,
>plus (wal size * number osds).  So it looks like my wals are actually
>sharing OSDs.  But I'd like to be 100% sure... so I am seeking a way to
>find out
>
>On Sun, Oct 21, 2018 at 11:13 AM Serkan Çoban <cobanserkan at gmail.com>
>wrote:
>
>> wal and db device will be same if you use just db path during osd
>> creation. i do not know how to verify this with ceph commands.
>> On Sun, Oct 21, 2018 at 4:17 PM Robert Stanford
><rstanford8896 at gmail.com>
>> wrote:
>> >
>> >
>> >  Thanks Serkan.  I am using --path instead of --dev (dev won't work
>> because I'm using VGs/LVs).  The output shows block and block.db, but
>> nothing about wal.db.  How can I learn where my wal lives?
>> >
>> >
>> >
>> >
>> > On Sun, Oct 21, 2018 at 12:43 AM Serkan Çoban
><cobanserkan at gmail.com>
>> wrote:
>> >>
>> >> ceph-bluestore-tool can show you the disk labels.
>> >> ceph-bluestore-tool show-label --dev /dev/sda1
>> >> On Sun, Oct 21, 2018 at 1:29 AM Robert Stanford <
>> rstanford8896 at gmail.com> wrote:
>> >> >
>> >> >
>> >> >  An email from this list stated that the wal would be created in
>the
>> same place as the db, if the db were specified when running
>ceph-volume lvm
>> create, and the db were specified on that command line.  I followed
>those
>> instructions and like the other person writing to this list today, I
>was
>> surprised to find that my cluster usage was higher than the total of
>pools
>> (higher by an amount the same as all my wal sizes on each node
>combined).
>> This leads me to think my wal actually is on the data disk and not
>the ssd
>> I specified the db should go to.
>> >> >
>> >> >  How can I verify which disk the wal is on, from the command
>line?
>> I've searched the net and not come up with anything.
>> >> >
>> >> >  Thanks and regards
>> >> >  R
>> >> >
>> >> > _______________________________________________
>> >> > ceph-users mailing list
>> >> > ceph-users at lists.ceph.com
>> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
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