unable to do svnadmin dump

Hi

I have a svn repository that seems partialy crashed.. I have test to do some
checkouts and that works, but am unable to dump the repository like this:
$ svnadmin dump nextgen > svn.dump

It stops on revision 85 with the following output:
svn: Filesystem has no such string
svn: locate_key: no such string `1e8'

The repository is rather big (3.4G, 3251 revisions)

"svnadmin recover" seems to run forever. (I look in /proc/[pid]/fd and
observers that svnadmin starts on a new file now and then, but in it's
current speed it will take a day or two before it have done them all.)

So I am wondering if I can saftely recover the svn repository this way:
- do a dump from an old binary backup, like this :
$cd backup
$svnadmin dump nextgen -r 0:2000 > old_backup.dump
- then dump the latest revision from my "live" repository:
$cd ../svnrepository
$svnadmin dump nextgen -r 2001:head > latest_revistions.dump

Can I then catenate old_backup.dump and latest_revistions.dump and import
this into a new repository ?
It seems reasonable but does anyone know for sure that this will work ?

I am using subversion-0.23.0-5972 and need a dump in order to upgarde to 0.28
Any help is appreciated

-- 
vidar
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