Discard is supported in kernel 3.18 rc1 or greater as per https://lkml.org/lkml/2014/10/14/450 > -----Original Message----- > From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of > Robert Sander > Sent: Friday, December 12, 2014 7:01 AM > To: ceph-users@xxxxxxxxxxxxxx > Subject: Re: Ceph Block device and Trim/Discard > > On 12.12.2014 12:48, Max Power wrote: > > > It would be great to shrink the used space. Is there a way to achieve > > this? Or have I done something wrong? In a professional environment > > you may can live with filesystems that only grow. But on my small > > home-cluster this really is a problem. > > As Wido already mentioned the kernel RBD does not support discard. > > When using qemu+rbd you cannot use the virto driver as this also does not > support discard. My best experience is with the virtual SATA driver and the > options cache=writeback and discard=on. > > Regards > -- > Robert Sander > Heinlein Support GmbH > Schwedter Str. 8/9b, 10119 Berlin > > http://www.heinlein-support.de > > Tel: 030 / 405051-43 > Fax: 030 / 405051-19 > > Zwangsangaben lt. §35a GmbHG: > HRB 93818 B / Amtsgericht Berlin-Charlottenburg, > Geschäftsführer: Peer Heinlein -- Sitz: Berlin _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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