[ceph-users] Moving bluestore WAL and DB after bluestore creation

Loris Cuoghi loris.cuoghi at artificiale.net
Thu Nov 16 00:45:09 PST 2017


Le Wed, 15 Nov 2017 19:46:48 +0000,
Shawn Edwards <lesser.evil at gmail.com> a écrit :

> On Wed, Nov 15, 2017, 11:07 David Turner <drakonstein at gmail.com>
> wrote:
> 
> > I'm not going to lie.  This makes me dislike Bluestore quite a
> > bit.  Using multiple OSDs to an SSD journal allowed for you to
> > monitor the write durability of the SSD and replace it without
> > having to out and re-add all of the OSDs on the device.  Having to
> > now out and backfill back onto the HDDs is awful and would have
> > made a time when I realized that 20 journal SSDs all ran low on
> > writes at the same time nearly impossible to recover from.
> >
> > Flushing journals, replacing SSDs, and bringing it all back online
> > was a slick process.  Formatting the HDDs and backfilling back onto
> > the same disks sounds like a big regression.  A process to migrate
> > the WAL and DB onto the HDD and then back off to a new device would
> > be very helpful.
> >
> > On Wed, Nov 15, 2017 at 10:51 AM Mario Giammarco
> > <mgiammarco at gmail.com> wrote:
> >  
> >> It seems it is not possible. I recreated the OSD
> >>
> >> 2017-11-12 17:44 GMT+01:00 Shawn Edwards <lesser.evil at gmail.com>:
> >>  
> >>> I've created some Bluestore OSD with all data (wal, db, and data)
> >>> all on the same rotating disk.  I would like to now move the wal
> >>> and db onto an nvme disk.  Is that possible without re-creating
> >>> the OSD?
> >>>
> >>> _______________________________________________
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> >>> ceph-users at lists.ceph.com
> >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> >>>
> >>>  
> >> _______________________________________________
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> >> ceph-users at lists.ceph.com
> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com  
> >
> >  
> This.  Exactly this.  Not being able to move the .db and .wal data on
> and off the main storage disk on Bluestore is a regression.
> 

Hello,

What stops you from dd'ing the DB/WAL's partitions on another disk and
updating the symlinks in the OSD's mount point under /var/lib/ceph/osd?


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