Crash recovery after a shutdown, lvm,reiser3.6,2.4.26, lost files

[Michele Nicosia <michele.nicosia@lastminutetour.com>]

Hi all,
    yesterday, after more tha three months of hard and good work, i 
shutted off my server, to test the start script in case o remote reboot.
After the shutdown, that apparently didn't show nothing abnormal, one of 
my larger lvm, with the home's users reported an error.
At a fist seen one disk seems to be not mounted becuase the vg/pv did 
not start.
After a restore of my lvm configuration, that vg/lv started correctly.
But many errors comes out :

Sep  7 20:14:26 giove kernel: for (lvm(58,1))
Sep  7 20:14:26 giove kernel: lvm(58,1):Using r5 hash to sort names
Sep  7 20:14:26 giove kernel: is_tree_node: node level 0 does not match 
to the expected one 2
Sep  7 20:14:26 giove kernel: lvm(58,1):vs-5150: search_by_key: invalid 
format found in block 12022576. Fsck?
Sep  7 20:14:26 giove kernel: lvm(58,1):vs-2140: finish_unfinished: 
search_by_key returned -2

And so on.
The reiserfsck without option, did not solve anything.
The disk was mountable, but a lot of damaged link insted of normal files 
were in many directory.
THe last thing to test was --rebuild-tree, that solved the problems of 
the damaged files, but not like i thinked, it was created a lost+found 
dir with a lot of  file, more than 30.000 and subdir.
I do not understand what happens, with an old server, 2.2.X and reiserfs 
3.5 without lvm, i switched of a lot of time with some partition of more 
than 100 g and NEVER a file was losted.
I forgot to say that into the lost+found i have only  file of  the 
courier maildir, but some well know  file, some avi's of 400mega, was 
completely lost!!
Why this happens?
Is the couple lvm-reiser less solid than reiser directly on a partition?

Thanks for any info, and sorry for the bad english.

Michele