e2fsck running extremely slowly

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I have a large filesystem (14 TB) which suffered a RAID failure which
seems to have corrupted some inodes.  Unfortunately as a result there
are now a number of inodes with "false extents" which result in a very
large number of multiply claimed blocks.

I have tried to run e2fsck on this filesystem, and it gets as far as
phase 1D, at which point it starts running at a glacial pace.  After 48
hours -- most of it sitting at 100% CPU executing no system calls at all
-- it claims to have processed a single file out of almost 10000.

Anything I can do (to rescue the filesystem or try to debug the problem)
other than "wipe and start over"?

I believe this is e2fsck 1.42.3 from Fedora 17.

	-hpa
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