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Re: [Xen-users] problem on cloing guest (SOLVED)

To: "Stephen Liu" <satimis@xxxxxxxxx>
Subject: Re: [Xen-users] problem on cloing guest (SOLVED)
From: "Grant McWilliams" <grantmasterflash@xxxxxxxxx>
Date: Wed, 17 Sep 2008 00:42:51 -0700
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On Wed, Sep 17, 2008 at 12:31 AM, Stephen Liu <satimis@xxxxxxxxx> wrote:

--- Grant McWilliams <grantmasterflash@xxxxxxxxx> wrote:

> On Mon, Sep 15, 2008 at 11:43 PM, Antoine Benkemoun <
> antoine.benkemoun@xxxxxx> wrote:
- snip -

> Also a note to the original poster, you may want to mess with bs= to
> find a
> better value.

Hi Grant,

By trial?  OR is there a forumla to calculate it?  TIA

Stephen L

Some people think it has to do with the size of the drive buffer but I just test a big value and it seems all values over a certain size yield the same performance. Start with bs=32768 or something and time it or use the output from dd to tell you how fast it was.

time dd if=/bigfile.bin of=/outfile.bin bs=32768

You can also get crazy and do bs=8M but I've not seen a lot of speedup doing that.

Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows."
Now they have two problems.

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