[Dovecot] Error: Corrupted index cache file /xxx/yyy/zzz/indexes/.INBOX/dovecot.index.cache: invalid record size

[florent at coppint.com]

Hi all, 

I got a problem with a Dovecot IMAP/POP installation.


Since a recent failure of our distributed file system (no loss of data
btw), Dovecot seems to have a problem with index cache files. 

For a
lot of accounts, I have this error in logs: 

Error: Corrupted index
cache file /xxx/yyy/zzz/indexes/.INBOX/dovecot.index.cache: invalid
record size 

If I delete all files from /indexes/ directory, it still
occurs... 

Do you see what can cause this problem ? Or what information
can I provide to help ? 

Our distributed FS is MooseFS. Dovecot is
configured like if it was NFS (no mmap, etc...). 

Thank you for your
help :) 

Flo