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Re: [Qemu-devel] Some uncertain about implementing stream optimized writ
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] Some uncertain about implementing stream optimized writing |
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Date: |
Wed, 29 Jun 2011 06:47:12 +0100 |
On Wed, Jun 29, 2011 at 5:47 AM, Fam Zheng <address@hidden> wrote:
> Stream optimized VMDK image allocates minimized space for a compressed
> cluster, which means if there is high compress ratio, a cluster
> possibly only takes one physical sector in the file. It makes
> overwriting hard, especially when new data needs more sectors than
> previously allocated.
>
> Attach the image to VMware and boot the VM to test this format, it
> seems that VMware wouldn’t do write to allocated clusters, but can
> allocate new cluster to save data.
What happens when the VM writes to allocated clusters? EIO?
Stefan