* the flushoncommit mount option
@ 2010-05-19 7:04 Mathijs Kwik
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From: Mathijs Kwik @ 2010-05-19 7:04 UTC (permalink / raw)
To: linux-btrfs
Hi all,
Over the past few months, I've been trying out btrfs on separate mountpoints.
I like it very much so I would like to try it on my home or root
volumes and see if I can do something fun with the snapshots.
As btrfs still isn't production-ready, I made sure everything is
backed-up to an external ext4 disk.
Now when I first moved to try out ext4, there were some issues with
the way it handled commits(I think) compared to ext3, which made some
desktop-applications act weird.
This was fixed later, but I don't remember if it was ext4 to blame or
the apps changing their behavior to not depend on ext2/3 semantics.
Now, looking at btrfs's mount options, the flushoncommit description
sounded vaguely familiar regarding these ext4 oddities.
However, I couldn't find a good description of what the
(dis)advantages of flushoncommit would be.
On the volume I used upto now (music/video storage), I didn't notice
any differences, but maybe using it for home (dotfiles) or root will
be a bit different.
Does anyone remember the ext4 oddities I'm talking about?
Are they related to this flushoncommit mount option or am a totally
missing the point here?
And in case it is related... should I use the option for root or home
or is it safe to leave out?
Thanks for any information about this.
Mathijs
FYI: I'm using xubuntu 10.04 64bit, with (backported) 2.6.34 and the
latest btrfs-progs from git.
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