* Re: [Qemu-devel] [ceph-users] rbd cache + libvirt [not found] ` <1451914026.12722300.1433778653126.JavaMail.zimbra@redhat.com> @ 2015-06-08 16:49 ` Andrey Korolyov 2015-06-09 15:01 ` Stefan Hajnoczi 0 siblings, 1 reply; 2+ messages in thread From: Andrey Korolyov @ 2015-06-08 16:49 UTC (permalink / raw) To: Jason Dillaman Cc: ceph-users@lists.ceph.com, Arnaud Virlet, qemu-devel@nongnu.org On Mon, Jun 8, 2015 at 6:50 PM, Jason Dillaman <dillaman@redhat.com> wrote: > Hmm ... looking at the latest version of QEMU, it appears that the RBD cache settings are changed prior to reading the configuration file instead of overriding the value after the configuration file has been read [1]. Try specifying the path to a new configuration file via the "conf=/path/to/my/new/ceph.conf" QEMU parameter where the RBD cache is explicitly disabled [2]. > > > [1] http://git.qemu.org/?p=qemu.git;a=blob;f=block/rbd.c;h=fbe87e035b12aab2e96093922a83a3545738b68f;hb=HEAD#l478 > [2] http://ceph.com/docs/master/rbd/qemu-rbd/#usage > Actually the mentioned snippet presumes *expected* behavior with cache=xxx driving the overall cache behavior. Probably the pass itself (from cache=none to proper bitmask values in a backend properties) is broken in some way. CCing qemu-devel for possible bug. ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [ceph-users] rbd cache + libvirt 2015-06-08 16:49 ` [Qemu-devel] [ceph-users] rbd cache + libvirt Andrey Korolyov @ 2015-06-09 15:01 ` Stefan Hajnoczi 0 siblings, 0 replies; 2+ messages in thread From: Stefan Hajnoczi @ 2015-06-09 15:01 UTC (permalink / raw) To: Andrey Korolyov Cc: ceph-users@lists.ceph.com, Arnaud Virlet, qemu-devel@nongnu.org, Josh Durgin, Jason Dillaman, Jeff Cody [-- Attachment #1: Type: text/plain, Size: 1051 bytes --] On Mon, Jun 08, 2015 at 07:49:15PM +0300, Andrey Korolyov wrote: > On Mon, Jun 8, 2015 at 6:50 PM, Jason Dillaman <dillaman@redhat.com> wrote: > > Hmm ... looking at the latest version of QEMU, it appears that the RBD cache settings are changed prior to reading the configuration file instead of overriding the value after the configuration file has been read [1]. Try specifying the path to a new configuration file via the "conf=/path/to/my/new/ceph.conf" QEMU parameter where the RBD cache is explicitly disabled [2]. > > > > > > [1] http://git.qemu.org/?p=qemu.git;a=blob;f=block/rbd.c;h=fbe87e035b12aab2e96093922a83a3545738b68f;hb=HEAD#l478 > > [2] http://ceph.com/docs/master/rbd/qemu-rbd/#usage > > > > Actually the mentioned snippet presumes *expected* behavior with > cache=xxx driving the overall cache behavior. Probably the pass itself > (from cache=none to proper bitmask values in a backend properties) is > broken in some way. > > CCing qemu-devel for possible bug. CCing Josh Durgin and Jeff Cody for block/rbd.c [-- Attachment #2: Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-06-08 16:49 ` [Qemu-devel] [ceph-users] rbd cache + libvirt Andrey Korolyov
2015-06-09 15:01 ` Stefan Hajnoczi
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