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

Liu Yuan namei.unix at gmail.com
Tue May 7 15:06:08 CEST 2013

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


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