Gentoo Archives: gentoo-user

From: "Marc Stürmer" <mail@×××××××××××××.de>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] btrfs and sparse VM image files
Date: Sun, 25 May 2014 08:38:02
Message-Id: 5381ABB0.5010201@marc-stuermer.de
In Reply to: Re: [gentoo-user] btrfs and sparse VM image files by Neil Bothwick
1 Am 19.05.2014 13:01, schrieb Neil Bothwick:
2
3 > The page you linked to does not actually state that. There are plenty of
4 > hints and sideways references but little concrete information about what
5 > is safe with the current release - hence my question.
6
7 Oh it does, just take a look at that section:
8
9 -----
10 Files with a lot of random writes can become heavily fragmented (10000+
11 extents) causing trashing on HDDs and excessive multi-second spikes of
12 CPU load on systems with an SSD or large amount a RAM.
13
14 * On servers and workstations this affects databases and virtual
15 ^^^^^^^
16 machine images.
17 ^^^^^^^^^^^^^^^
18
19 * The nodatacow mount option may be of use here, with associated gotchas.
20 -----
21
22 So they still do not recommend putting virtual machine images on a Btrfs
23 (if you want it in productional use, that is).