Re: how to debug slow rbd block device

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On 05/22/2012 11:18 PM, Stefan Priebe - Profihost AG wrote:
Hi,

So try enabling RBD writeback caching — see http://marc.info
/?l=ceph-devel&m=133758599712768&w=2
will test tomorrow. Thanks.
Can we path this to the qemu-drive option?

Yup, see http://article.gmane.org/gmane.comp.file-systems.ceph.devel/6400

The normal qemu cache=writeback/writethrough/none option will work in qemu 1.2.

Josh
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