[ceph-users] Fastest way to find raw device from OSD-ID? (osd -> lvm lv -> lvm pv -> disk)

Alfredo Deza adeza at redhat.com
Mon Oct 8 14:33:54 PDT 2018


On Mon, Oct 8, 2018 at 5:04 PM Paul Emmerich <paul.emmerich at croit.io> wrote:
>
> ceph-volume unfortunately doesn't handle completely hanging IOs too
> well compared to ceph-disk.

Not sure I follow, would you mind expanding on what you mean by
"ceph-volume unfortunately doesn't handle completely hanging IOs" ?

ceph-volume just provisions the OSD, nothing else. If LVM is hanging,
there is nothing we could do there, just like ceph-disk wouldn't be
able to do anything if the partitioning
tool would hang.



> It needs to read actual data from each
> disk and it'll just hang completely if any of the disks doesn't
> respond.
>
> The low-level command to get the information from LVM is:
>
> lvs -o lv_tags
>
> this allows you to map a LV to an OSD id.
>
>
> Paul
> Am Mo., 8. Okt. 2018 um 12:09 Uhr schrieb Kevin Olbrich <ko at sv01.de>:
> >
> > Hi!
> >
> > Yes, thank you. At least on one node this works, the other node just freezes but this might by caused by a bad disk that I try to find.
> >
> > Kevin
> >
> > Am Mo., 8. Okt. 2018 um 12:07 Uhr schrieb Wido den Hollander <wido at 42on.com>:
> >>
> >> Hi,
> >>
> >> $ ceph-volume lvm list
> >>
> >> Does that work for you?
> >>
> >> Wido
> >>
> >> On 10/08/2018 12:01 PM, Kevin Olbrich wrote:
> >> > Hi!
> >> >
> >> > Is there an easy way to find raw disks (eg. sdd/sdd1) by OSD id?
> >> > Before I migrated from filestore with simple-mode to bluestore with lvm,
> >> > I was able to find the raw disk with "df".
> >> > Now, I need to go from LVM LV to PV to disk every time I need to
> >> > check/smartctl a disk.
> >> >
> >> > Kevin
> >> >
> >> >
> >> > _______________________________________________
> >> > ceph-users mailing list
> >> > ceph-users at lists.ceph.com
> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> >> >
> >
> > _______________________________________________
> > ceph-users mailing list
> > ceph-users at lists.ceph.com
> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
>
>
> --
> Paul Emmerich
>
> Looking for help with your Ceph cluster? Contact us at https://croit.io
>
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