Messages in this thread | | | Date | Tue, 20 Sep 2005 21:15:20 -0400 | From | Ric Wheeler <> | Subject | Re: I request inclusion of reiser4 in the mainline kernel |
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Gregory Maxwell wrote: > On 9/20/05, Theodore Ts'o <tytso@mit.edu> wrote: > >>There is a very interesting paper that I coincidentally just came >>across today that talks about making filesystems robust against >>various different forms of failures of modern disk systems. It is >>going to be presented at the upcoming 2005 SOSP conference. >> >> http://www.cs.wisc.edu/adsl/Publications/iron-sosp05.pdf > > > Very interesting indeed, although it almost seems silly to tackle the > difficult problem of making filesystems highly robust against oddball > failure modes while our RAID subsystem falls horribly on it's face in > the fairly common (and conceptually easy to handle) failure mode of a > raid-5 where two disks have single unreadable blocks on differing > parts of the disk. (the current raid system hits one bad block, fails > the whole disk, then you attempt a rebuild and while reading hits the > other bad block and downs the array).
I don't have any problem with fixing RAID code, but I would not describe the errors in this paper as oddball. Believe me, we see a lot of disk issues and these are real examples of failures that happen to real file systems ;-)
Ric
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