Missing revision file in server directory

Hi,

I'm running a 1.5.3/FSFS subversion server (on Solaris/ZFS), and we recently
had a revision file and its associated revprops file disappear from the
server. This was apparently caused by subversion itself, as there is no
evidence of tampering and no evidence of filesystem damage. Some details are
appended below in case anyone is interested, but that's not the main
question here.

My repository is obviously damaged. I cannot dump revisions past the missing
one. Attempting to dump single revisions of any revision results in a
runaway process that is doing something I can't quite determine, but it
wrote >60G to my disk last night before I killed it. :-( I would like to
dummy up a minimal replacement for the missing revs/ and revprops/ files so
that I can at least get a dump and filter out the missing revision. The data
are long gone, obviously.

Does anyone know how to specify a minimal revision (and revprops) file that
will satisfy the server at least to the point of permitting a dump? Or does
anyone have any other suggestions for dealing with this issue?

----
Some details which may or may not be useful to someone:
The revision in question was checked in successfully. There was a backup
(using hot-backup.py) running at the time of commit which completed
successfully but which, obviously, did not include the affected revision.
The committed revision was present on the disk at that point as our
FishEye+Crucible instance slurped it correctly. The next backup was
scheduled to run four hours later. The developer made some further changes
to the files involved in this commit and those changes were also
successfully committed (and they are still there). About two hours after the
commit, the FishEye logs show an error when FishEye tried to access that
revision. When the next scheduled backup ran, the backup failed because the
revision had disappeared. There is nothing in any logs to indicate what
happened; no developer checking in ever received an error of any kind. In
short, the revision was there, was there for a couple of hours, and then ...
disappeared. I have no idea what caused this.
Thanks,
Kate Ebneter
Build Engineer
Ning, Inc.
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