I have fint the way to change the extent size hint
mkfs.xfs -r extsize=40960 /dev/sda1
but I should rebuild the disk, do you have a way more smooth?mkfs.xfs -r extsize=40960 /dev/sda1
On Mon, May 30, 2016 at 4:48 PM, baotiao <baotiao@xxxxxxxxx> wrote:
how can I set the extent size hint to a file with command line?I have google for a lot, but I can't find a answer----------------------------------------
Github: https://github.com/baotiao
Blog: http://baotiao.github.io
Stackoverflow: http://stackoverflow.com/users/634415/baotiaoOn May 30, 2016, at 13:04, Dave Chinner <david@xxxxxxxxxxxxx> wrote:On Mon, May 30, 2016 at 12:45:07PM +0800, baotiao wrote:This machine is running for qemu, the file is qemu qcow file type
[root@w-openstack20 /data/nova/instances/7898b630-c4ef-49ab-9ce9-3735e090c282]# file disk
disk: QEMU QCOW Image (v3), has backing file (path /data/nova/instances/_base/3f27393376152ac352b2d85703011e38517e), 429496729600 bytes
Oh, you're using delta/snapshot based qcow images. That, by it's
very nature, generates fragmented image files as they are a delta
over the backing file.
....actual 48421430, ideal 20716, fragmentation factor 99.96%
How can I solve this problem, what do you suggest me to do?
Use a extent size hint (say 1-8MB) for your qcow2 image files so that
they don't fragment badly as they are written to.
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
--
---
Blog: http://www.chenzongzhi.info
Twitter: https://twitter.com/baotiao
Git: https://github.com/baotiao
Blog: http://www.chenzongzhi.info
Twitter: https://twitter.com/baotiao
Git: https://github.com/baotiao
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