Linked by Thom Holwerda on Tue 31st Mar 2009 15:47 UTC, submitted by Rahul
Fedora Core The Fedora team has announced the Fedora 11 beta release. It comes packed with new features, such as Ext4 as the default filesystem, Nouveau driver by default, kernel mode setting on Intel, ATI and Nvidia drivers, many virtualization improvements, IBus input method, GCC 4.4, and much more.
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RE[4]: Ext4 as default
by broch on Tue 31st Mar 2009 19:26 UTC in reply to "RE[3]: Ext4 as default"
broch
Member since:
2006-05-04

no problem:
http://lkml.org/lkml/2009/3/24/460
http://lkml.org/lkml/2009/3/24/415

of course I would suggest to read all because there are different arguments and points of view.
However, one cannot call something "thoroughly tested" if patch was introduced recently.
That is a whole point.

Moreover this (data loss) was a problem with xfs, which was fixed two years ago (patched in 2007). So with all due respect for ext4 developers (including the one who came from xfs), it seems that they may somehow skip other obvious (and well described) reasons for fs malfunctioning.

I have no doubts that eventually all problems will be ironed out, but I don't think that this is it now.

From what I understood Linus was mostly complaining about the default settings for ext4 which could cause dataloss. However, you only need to specify one single option when mounting ext4 and the problem goes away.

that is not what this bug was/is about. The problem is with the order data are written.
If you apply this "single option" you can as well go back to ext3 which is better tested.

Edited 2009-03-31 19:32 UTC

Reply Parent Score: 1

RE[5]: Ext4 as default
by Rahul on Tue 31st Mar 2009 19:35 in reply to "RE[4]: Ext4 as default"
Rahul Member since:
2005-07-06

"Moreover this (data loss) was a problem with xfs, which was fixed two years ago (patched in 2007). So with all due respect for ext4 developers (including the one who came from xfs), it seems that they may somehow skip other obvious (and well described) reasons for fs malfunctioning."

Err, all the patches going into 2.6.30 are based on the same hacks that went into XFS.

http://lwn.net/Articles/323752/

Reply Parent Score: 1

RE[6]: Ext4 as default
by sbergman27 on Tue 31st Mar 2009 19:49 in reply to "RE[5]: Ext4 as default"
sbergman27 Member since:
2005-07-24

It looks to me like Ted is too focused on benchmark numbers to realize the inevitability of allocate-on-commit as an ext4 feature, and furthermore, as a default. Anyone who cares about Linux's reputation for stability must accept that writing metadata ahead of data is simply insane. And if that hurts us in some benchmarks, then so be it. People who don't case about their data can always revert to the unstable behavior which is the default, even with the 2.6.30 patches.

Reply Parent Score: 6

RE[6]: Ext4 as default
by broch on Tue 31st Mar 2009 19:53 in reply to "RE[5]: Ext4 as default"
broch Member since:
2006-05-04

err, these patches were introduced two years ago.
so this was known, problem and fixed long time ago in xfs. Still it needed this whole hoopla now before known issue was fixed (but not tested in ext4)

Reply Parent Score: 1