Re: rsync

[guerrier]

On Thu, May 12, 2011 at 9:48 AM, Matt Oates (Home) <mattoates@gmail.com> wrote:
> Hi Guerrier,
>
> On 11 May 2011 23:37, guerrier <guerrier@gmail.com> wrote:
>> Hello
>> Can one use parallel to speed up rsync -avz dir1 dir2 ?  How would one
>> phrase that?
>
> Is parallel a great idea here?

That's my real question.  I have a failing hdd, from which i would
like to move as much data as possible as fast possible.

> If dir1 and dir2 local to a single file system then parallel will not
> speed anything up, if anything it will slow it down causing lots of
> context switches waiting on IO, you can just take out the z option too
> as that will be gaining you nothing and wasting a fair amount of CPU
> time. If it's a remote directory you kind of have the same problem as
> your network will be the bottle neck this time, but parallel could
> really speed up the compression/decompression step for this at each
> end.
>
> Matt.
>

Thanks,
guerrier