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Re: [Xen-users] Will this work? (Zeroing free space)

To: Aleix Dorca <adorca@xxxxxx>
Subject: Re: [Xen-users] Will this work? (Zeroing free space)
From: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Date: Fri, 21 Aug 2009 14:39:09 +0700
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On Fri, Aug 21, 2009 at 2:31 PM, Aleix Dorca<adorca@xxxxxx> wrote:
> I have some Win2003 VMs using disks via iscsi. I do backups using snapshots
> on LVM, dd and gzip. So far so good.

> I wonder if this would work. I'd stop the VM and mount the disk temporarily
> on a iscsi client (maybe not necessary on ext3 partitions) and then I'd do a
> "dd if=/dev/zero of=file". After filling all available space on the disk I'd
> delete the file, thus leaving all free space zeroed.

In theory, they should work. In practice, last time I tried the
zeroing process (note: there's sdelete for Windows) simply took too
much time and disk bandwitdh to be useful.


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