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From: Stefan Priebe <s.priebe@profihost.ag>
Message-ID: <56CB6DC2.8040106@profihost.ag>
Date: Mon, 22 Feb 2016 21:21:22 +0100
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Subject: [Qemu-devel] drive-backup
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To: qemu-devel <qemu-devel@nongnu.org>
Cc: Timo Grodzinski <t.grodzinski@profihost.ag>

Hello,

is there any chance or hack to work with a bigger cluster size for the 
drive backup job?

See:
http://git.qemu.org/?p=qemu.git;a=blob;f=block/backup.c;h=16105d40b193be9bb40346027bdf58e62b956a96;hb=98d2c6f2cd80afaa2dc10091f5e35a97c181e4f5

This is very slow with ceph - may be due to the 64k block size. I would 
like to check whether this is faster with cephs native block size of 4mb.

Greets,
Stefan