* Is using the 'discard' mount option safe on an rbd? @ 2012-09-06 21:57 Nick Bartos 2012-09-06 22:14 ` Josh Durgin 0 siblings, 1 reply; 2+ messages in thread From: Nick Bartos @ 2012-09-06 21:57 UTC (permalink / raw) To: ceph-devel Is it safe to use the discard mount option when mounting a xfs filesystem on an rbd (using the kernel driver)? We're currently using kernel 3.5.3 and Ceph 0.48.1. Also, are there any stability issues doing it from a qemu VM? It looks like support for rbd discard was added in qemu 1.1, but I wasn't sure how stable it was. ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Is using the 'discard' mount option safe on an rbd? 2012-09-06 21:57 Is using the 'discard' mount option safe on an rbd? Nick Bartos @ 2012-09-06 22:14 ` Josh Durgin 0 siblings, 0 replies; 2+ messages in thread From: Josh Durgin @ 2012-09-06 22:14 UTC (permalink / raw) To: Nick Bartos; +Cc: ceph-devel On 09/06/2012 02:57 PM, Nick Bartos wrote: > Is it safe to use the discard mount option when mounting a xfs > filesystem on an rbd (using the kernel driver)? We're currently using > kernel 3.5.3 and Ceph 0.48.1. The kernel rbd driver doesn't support discard yet (http://tracker.newdream.net/issues/190). > Also, are there any stability issues doing it from a qemu VM? It > looks like support for rbd discard was added in qemu 1.1, but I wasn't > sure how stable it was. There was one bug (http://tracker.newdream.net/issues/2958) whose fix will be in the next release. Note that you need an extra qemu option (http://tracker.newdream.net/issues/2777) for the guest to detect discard support. Josh ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2012-09-06 22:14 UTC | newest] Thread overview: 2+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2012-09-06 21:57 Is using the 'discard' mount option safe on an rbd? Nick Bartos 2012-09-06 22:14 ` Josh Durgin
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