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Date: Tue, 21 Jul 2009 13:44:07 -0400 From: Valerie Aurora <vaurora@...hat.com> To: Theodore Tso <tytso@....edu> Cc: Ric Wheeler <rwheeler@...hat.com>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>, "Stephen C. Tweedie" <sct@...hat.com>, Eric Sandeen <esandeen@...hat.com>, Andreas Dilger <adilger@....com>, Chris Mason <chris.mason@...cle.com>, Josef Bacik <jbacik@...hat.com>, Mingming Cao <cmm@...ibm.com> Subject: Re: ext3 default journal mode On Mon, Jul 20, 2009 at 10:00:50PM -0400, Theodore Tso wrote: > On Mon, Jul 20, 2009 at 07:04:03PM -0400, Valerie Aurora wrote: > > > > I think it's extremely accurate and detailed, but too long - people's > > brains turn off after about the 15th line or so. Here's an attempt to > > distill your description down and refer out to another document (which > > one?) for people who want to learn more. > > Fair enough; I've created an external document here: > > http://ext4.wiki.kernel.org/index.php/Ext3_Data%3DOrdered_vs_Data%3DWriteback_mode > > Comments? Nice! > > config EXT3_DEFAULTS_TO_ORDERED > > bool "Default to 'data=ordered' in ext3" > > depends on EXT3_FS > > help > > > > If the mount options for an ext3 filesystem do not > > include a journal mode, mount it in "data=ordered" mode. > > Let me give a try at this: > > The journal mode options for ext3 have different tradeoffs > between when data is guaranteed to be on disk and > performance. The use of "data=writeback" can cause > unwritten data to appear in files after an system crash or > power failure, which can be a security issue. However, > "data=ordered" mode can also result in major performance > problems, including seconds-long delays before an fsync() > call returns. For details, see: > > http://ext4.wiki.kernel.org/index.php/Ext3_Data%3DOrdered_vs_Data%3DWriteback_mode > > If you have been historically happy with ext3's performance, > data=ordered mode will be a safe choice and you should > answer "y" here. If you understand the reliability and data > privacy issues of data=writeback and are willing to make > that trade off, answer "n". This is great. Ship it! -VAL -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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