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Re: [Qemu-devel] qcow2: slow internal snapshot creation
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From: |
Kevin Wolf |
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Subject: |
Re: [Qemu-devel] qcow2: slow internal snapshot creation |
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Date: |
Fri, 23 Nov 2012 15:58:09 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 |
Am 23.11.2012 15:17, schrieb Alexandre DERUMIER:
>>> Preallocation doesn't matter much these days.
>
> I have done benchmark through nfs on a netapp san, (with directio),
>
> I got 300 iops without preallocation, and 6000 iops with preallocation ....
This doesn't sound right, even for writethrough modes.
Can you post more details about your benchmark setup so that this can be
reproduced? And does it reproduce with local files as well or only using
NFS?
Kevin
Re: [Qemu-devel] qcow2: slow internal snapshot creation, Kevin Wolf, 2012/11/23