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 <aderumier@xxxxxxxxx>
To: Graeme Lambert <glambert@xxxxxxxxxxx>
Cc: ceph-users@xxxxxxxxxxxxxx
Subject: Re: 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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