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From: | Alex Bennée |
Subject: | Re: [Qemu-devel] [PATCH] qemu-img: set nocow flag to new file |
Date: | Thu, 14 Nov 2013 09:44:42 +0000 |
User-agent: | mu4e 0.9.9.6pre2; emacs 24.3.1 |
address@hidden writes: > Set NOCOW flag to newly created images to solve performance issues on btrfs. > > Btrfs has terrible performance when hosting VM images, even more when the > guest > in those VM are also using btrfs as file system. One way to mitigate this bad > performance is to turn off COW attributes on VM files (since having copy on > write for this kind of data is not useful). <snip> It's been a while since I had to mess with this performance mystery but I recall you also need to ensure the partition needs to be mounted with the nodatacow mount option. Unless this has changed we should probably warn the user about that. -- Alex Bennée
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