Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)

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To: Theodore Tso <tytso@...>, Bryan Henderson <hbryan@...>, Ric Wheeler <ric@...>, Al Boldi <a1426z@...>, Alan Cox <alan@...>, David Chinner <dgc@...>, <linux-kernel@...>, Pavel Machek <pavel@...>, Daniel Phillips <phillips@...>, Rik van Riel <riel@...>, Valerie Henson <val.henson@...>
Date: Friday, January 18, 2008 - 11:26 am

Theodore Tso wrote:

There is extensive per sector error correction on each sector written. 
What you would see in this case (or many, many other possible ways 
drives can corrupt media) is a "media error" on the next read.

You would never get back the partially written contents of that sector 
at the host.

Having our tools (fsck especially) be resilient in the face of media 
errors is really critical. Although I don't think the scenario of a 
partially written sector is common, media errors in general are common 
and can develop over time.


See the NetApp paper from Sigmetrics 2007 for some interesting analysis...


ric
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Messages in current thread:
[RFD] Incremental fsck, Al Boldi, (Tue Jan 8, 5:22 pm)
Re: [RFD] Incremental fsck, Alan, (Tue Jan 8, 5:31 pm)
Re: [RFD] Incremental fsck, Andreas Dilger, (Wed Jan 9, 5:16 am)
Re: [RFD] Incremental fsck, Daniel Phillips, (Sat Jan 12, 7:55 pm)
Re: [RFD] Incremental fsck, Rik van Riel, (Tue Jan 8, 5:41 pm)
Re: [RFD] Incremental fsck, Al Boldi, (Wed Jan 9, 12:40 am)
Re: [RFD] Incremental fsck, , (Wed Jan 9, 4:04 am)
Re: [RFD] Incremental fsck, Valerie Henson, (Wed Jan 9, 3:45 am)
Re: [RFD] Incremental fsck, Al Boldi, (Wed Jan 9, 7:52 am)
Re: [RFD] Incremental fsck, Theodore Tso, (Sat Jan 12, 10:51 am)
Re: [RFD] Incremental fsck, Daniel Phillips, (Sun Jan 13, 8:22 pm)
Re: [RFD] Incremental fsck, Pavel Machek, (Sun Jan 13, 1:19 pm)
Re: [RFD] Incremental fsck, Ric Wheeler, (Mon Jan 14, 9:04 pm)
Re: [RFD] Incremental fsck, Alan Cox, (Sun Jan 13, 1:41 pm)
Re: [Patch] document ext3 requirements (was Re: [RFD] Increm..., Szabolcs Szakacsits, (Thu Jan 17, 8:29 am)
Re: [Patch] document ext3 requirements (was Re: [RFD] Increm..., Christoph Hellwig, (Wed Jan 16, 12:38 pm)
Re: [Patch] document ext3 requirements (was Re: [RFD] Increm..., Ric Wheeler, (Fri Jan 18, 11:26 am)
Re: [Patch] document ext3 requirements (was Re: [RFD] Increm..., linux-os (Dick Johnson), (Fri Jan 18, 11:16 am)
Re: [RFD] Incremental fsck, Al Boldi, (Sun Jan 13, 7:05 am)
Re: [RFD] Incremental fsck, Rik van Riel, (Wed Jan 9, 10:44 am)
Re: [RFD] Incremental fsck, Al Boldi, (Thu Jan 10, 9:26 am)