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

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To: Alan Cox <alan@...>
Cc: Pavel Machek <pavel@...>, David Chinner <dgc@...>, Theodore Tso <tytso@...>, Al Boldi <a1426z@...>, Valerie Henson <val.henson@...>, Rik van Riel <riel@...>, <linux-fsdevel@...>, <linux-kernel@...>
Date: Tuesday, January 15, 2008 - 9:24 pm

On Jan 15, 2008 7:15 PM, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:

Indeed, you are right, which is supported by actual measurements:

    http://sr5tech.com/write_back_cache_experiments.htm

Sorry for implying that anybody has engineered a drive that can do
such a nice thing with writeback cache.

The "disk motor as a generator" tale may not be purely folklore.  When
an IDE drive is not in writeback mode, something special needs to done
to ensure the last write to media is not a scribble.

A small UPS can make writeback mode actually reliable, provided the
system is smart enough to take the drives out of writeback mode when
the line power is off.

Regards,

Daniel
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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..., Daniel Phillips, (Tue Jan 15, 9:24 pm)
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)