mailboxes.db unreadable, recovery procedure?

[!jeff!{InterVerse}]

Wes,

thanks for the response.  I still have the problem.

At 01:42 PM 8/25/2006, you wrote:
>What error are you getting that indicates that mailboxes.db is
>unreadable?


a bunch of places, but here's one:
sudo -u cyrus /usr/local/cyrus/bin/reconstruct -r -f user
fatal error: can't read mailboxes file



>I suspect that the backups will also be unreadable, due
>to the way they are made.  If they *are* readable, as the cyrus user:
>
>         ctl_mboxlist -d -f db.backup1/mailboxes.db > somefile.txt

%ctl_mboxlist -d -f db.backup1/mailboxes.db > somefile.txt
fatal error: can't read mailboxes file
%ctl_mboxlist -d -f db.backup2/mailboxes.db > somefile.txt
fatal error: can't read mailboxes file

>You'll want to examine "somefile.txt" to decide if it's more or less
>reasonable.  Then move mailboxes.db and the contents of db directory
>out of the way.  Run:
>
>         ctl_mboxlist -u < somefile.txt
>
>You'll probably want to run:
>
>         ctl_mboxlist -d
>
>again to see whether it worked.

OK, so that doesn't work.  Now what can I do?

>Also, the reconstruct -m thing is kind of misleading.  reconstruct is
>still available, and can be used to regenerate mailboxes.db from the
>contents of the cyrus spool area.  More or less :)

how do I use reconstruct to regenerate mailboxes.db from the contents of 
the cyrus spool area?










>:wes
>
>On 25 Aug 2006, at 12:48, !jeff!{InterVerse} wrote:
>>I have a cyrus system with only about 20 users on it.  They have
>>about 3 gigs of mail.
>>
>>The mailboxes.db file is unreadable.  of course, reconstruct -m is
>>unavailable, in typical dougadamsian fashion.
>>
>>I have seen recommendations to try to 'rebuild the db' using the
>>'db.backup1' or 'db.backup2' directories.  I have the dirs.  What
>>specific command (including flags) do I use to attempt that?
>>
>>i have seen use 'ctl_cyrusdb -r' but I keep getting segmentation
>>fault and core dump.  I have tried that with and without my
>>corrupted mailboxes.db file in place.  what does that tell us?
>>
>>Since it's such a small system, a backup the mail spool, reinstall,
>>recreate user accounts type of approach would work for me if that's
>>the simplest thing to do... or just a 'run this command to get a
>>fresh mailboxes file'... but I don't know how.
>>
>>Can somebody please give me a step by step here?