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List:       ceph-users
Subject:    Re: [ceph-users] Cephfs on an EC Pool - What determines object size
From:       Gregory Farnum <gfarnum () redhat ! com>
Date:       2019-04-29 22:49:17
Message-ID: CAJ4mKGYJH6PoggGi9BQg5nRmfud91RF5C-LRypLMWNuoPcxK1w () mail ! gmail ! com
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Yes, check out the file layout options:
http://docs.ceph.com/docs/master/cephfs/file-layouts/

On Mon, Apr 29, 2019 at 3:32 PM Daniel Williams <danielwoz@gmail.com> wrote:
> 
> Is the 4MB configurable?
> 
> On Mon, Apr 29, 2019 at 4:36 PM Gregory Farnum <gfarnum@redhat.com> wrote:
> > 
> > CephFS automatically chunks objects into 4MB objects by default. For
> > an EC pool, RADOS internally will further subdivide them based on the
> > erasure code and striping strategy, with a layout that can vary. But
> > by default if you have eg an 8+3 EC code, you'll end up with a bunch
> > of (4MB/8=)512KB objects within the OSD.
> > -Greg
> > 
> > On Sun, Apr 28, 2019 at 12:42 PM Daniel Williams <danielwoz@gmail.com> wrote:
> > > 
> > > Hey,
> > > 
> > > What controls / determines object size of a purely cephfs ec (6.3) pool? I have \
> > > large file but seemingly small objects. 
> > > Daniel
> > > _______________________________________________
> > > ceph-users mailing list
> > > ceph-users@lists.ceph.com
> > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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