Does anybody else think there is a problem with the docs/settings here...
> Message: 13 > Date: Thu, 06 Feb 2014 12:11:53 +0100 (CET) > From: Alexandre DERUMIER <aderum...@odiso.com> > To: Graeme Lambert <glamb...@adepteo.net> > Cc: ceph-users@lists.ceph.com > Subject: Re: [ceph-users] RBD Caching - How to enable? > Message-ID: <d0af5e59-ea2a-471e-be65-ff273d0c0216@mailpro> > Content-Type: text/plain; charset=utf-8 > > >>OK, so I need to change ceph.conf on the compute nodes? > yes. > > >>Do the VMs using RBD images need to be restarted at all? > I think yes. > > >>Anything changed in the virsh XML for the nodes? > > you need to add cache=writeback for your disks > > If you use qemu > 1.2, no need to add "rbd cache = true" to ceph .conf :) > http://ceph.com/docs/next/rbd/qemu-rbd/ This page reads "If you set rbd_cache=true, you must set cache=writeback or risk data loss." ... That's an inverted definition of writeback AFAIK! -- Cheers, ~Blairo
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