[sheepdog-users] Enable cache on some nodes and some not

[Joseph Glanville]

HI Liu,

When using cache=writeback are writes flushed to the cluster on
REQ_FUA/FLUSH? Or are they only flushed to object cache?

Joseph.


On Tue, May 7, 2013 at 6:06 AM, Liu Yuan <namei.unix at gmail.com> wrote:

> On 05/07/2013 08:45 PM, Valerio Pachera wrote:
> > Is it possible to enable cache only on some nodes of the cluster?
> >
>
> Sure. The object cache stores the data on the node where runs sheep
> daemon that VM connect to.
>
> There are two ways to disable object cache:
>  1 no '-w' option enabled at startup. Cache is completely disabled for
> this node. Cache option control from QEMU command is meaningless.
>
>  2 '-w' for sheep is enabled. Then QEMU take control of cache mode of
> the VM connected to this sheep.
>    - cache=writeback, enables the writeback cache for this VM
>    - cache=directio, disable the cache for this VM
>    - cache=writethrough, enables the writethrough cache for this VM
>
> Thanks,
> Yuan
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>
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