Can ceph act in a raid-5 (or raid-6) mode, storing objects so that storage overhead of n/(n-1)? For some systems where the underlying OSD's are known to be very reliable, but where the storage is very tight, this could be useful.
-----Original Message----- From: ceph-users-boun...@lists.ceph.com [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Mark Kirkwood Sent: Thursday, April 10, 2014 7:21 PM To: Udo Lembke; ceph-users@lists.ceph.com Subject: Re: [ceph-users] OSD space usage 2x object size after rados put On 11/04/14 06:35, Udo Lembke wrote: > Hi, > > On 10.04.2014 20:03, Russell E. Glaue wrote: >> I am seeing the same thing, and was wondering the same. >> >> We have 16 OSDs on 4 hosts. The File system is Xfs. The OS is CentOS 6.4. >> ceph version 0.72.2 >> >> I am importing a 3.3TB disk image into a rbd image. >> At 2.6TB, and still importing, 5.197TB is used according to `rados -p <pool> >> df` > that's looks normal for me. With replication of 2 you have all data > twice: 2*2.6TB=5.2TB > > No, the replication of the pg goes to different OSDs - In my case they are on different hosts (and I have replication level 3 also). _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
