[sheepdog] [PATCH v2 3/4] sheep, dog: fast deep copy for snapshot

Liu Yuan namei.unix at gmail.com
Tue Feb 3 04:47:28 CET 2015

On Mon, Jan 19, 2015 at 07:28:53PM +0900, Hitoshi Mitake wrote:
> dog vdi snapshot <vdi> --no-share has a bottleneck: the dog
> process. This patch adds a new option --fast-deep-copy to dog vdi
> snapshot, which avoid the bottleneck.

It seems to me --no-share and --fast-deep-copy has some relations, they all try
to achieve the same purpose, right? But the wording quit differs, which might
cause troulbe for uesrs to understand.

> If the option is passed to the dog command, actual copying of data
> objects are done by sheep processes. So the dog process isn't a
> bottleneck in this case.

If sheep is busy, e.g, busy with VMs or in recovery state, will this option
worsen the situation? That is, make the slow VM slower and in return, this
command will be excueted slower and slower.


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