[RFC PATCH 0/3] qemu: Propagate cluster size to new qcow2 images
Eric Blake
eblake at redhat.com
Wed Aug 26 15:32:04 UTC 2020
On 8/26/20 9:56 AM, Peter Krempa wrote:
> Cluster size may have performatnce implications. Propagate the cluster
> size used by the original image to any copy or overlay.
>
> Peter Krempa (3):
> qemu: monitor: Detect image cluster size from
> 'query-named-block-nodes'
> qemu: block: Allow specifying cluster size when using
> 'blockdev-create'
> qemuBlockStorageSourceCreateDetectSize: Propagate cluster size for
> 'qcow2'
It's not as flexible as allowing the user to customize sizes, but it
definitely makes sense and is a sane heuristic, better than
adccidentally creating an overlay with 64k clusters atop a base image
with 1M clusters.
Series:
Reviewed-by: Eric Blake <eblake at redhat.com>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
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