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SubjectRe: Numbers: ext2/ext3/reiser Performance (ext3 is slow)
On Sat, 10 Nov 2001 arjan@fenrus.demon.nl wrote:
> ext3 by default imposes stricter ordering than the other journalling
> filesystems in order to improve _data_ consistency (as opposed to just
> the guarantee of consistent metadata as most other filesystems do).
> if you mount the filesystem with
>
> mount -t ext3 -o data=writeback /dev/foo /mnt/bar
>
> will make it use the same level of guarantee as reiserfs does.
>
> mount -t ext3 -o data=journal /dev/foo /mnt/bar

test with writeback and journal a already running. But this will take some
time. as far as i can tell now writeback is really much faster.
The question is, when to use what mode. I would use data=journal on my
CVS-Archive, and maybe writeback on a news-server.
But what to use for an database like mysql ?
Someone mailed me and asked why use a journal for an database ?
Well, I think for speed of reboot after failover or crash.
I don't know if mysql journals data itself.

Oktay Akbal


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