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Re: [Xen-users] Zero LVM

To: Thomas Ronner <thomas@xxxxxxxxxx>, Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Zero LVM
From: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Date: Mon, 06 Dec 2010 16:52:17 +0000
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On 06/12/10 16:39, Thomas Ronner wrote:
Hi Jonathan,

On 12/6/10 5:24 PM, Jonathan Tripathy wrote:
Hi Everyone,

When providing Xen guests to cutomers, it is important to make sure that the LVM LV is "zeroed" before use. What is the correct syntax to do this?

I've tried:

dd if=/dev/zero of=/dev/vg0/lvname

however this seems to go on forever (unless my test machine is just slow!)

Any ideas?

That command will use a default block size of 512 bytes which takes, indeed, forever. Try:

dd if=/dev/zero of=/dev/vg0/lvname bs=1M

Thanks for that!

I'm now getting No space left on device. I'm guessing I have to use a count parameter. What value would I set it at?


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