Help on reconstruct - Cyrus2.3.11

[Ismaël Tanguy]

Hello, this is a Cyrus 2.3.11 on Centos 5.
About 5000 users for 10 To.

Mail storage has been moved from NetApp NFS to FluidsFS (aka Dell 
Compellent NFS).
Since an update on FluidFS, Imap spool undergoes daily NFS timeouts 
which leads to corrupt mailboxes.
Typically, this begins with lines like this in /var/log/messages:

Dec  5 09:54:43 mailhost kernel: lockd: server 192.xxx.xx.xx not responding, timed out

Which is followed by IOERROR for accessed mailboxes during NFS timeout:

Dec  5 09:54:47 mailhost lmtpunix[14542]: IOERROR: locking index for user.xxxx: Input/output error
Dec  5 09:54:47 mailhost imaps[21999]: IOERROR: locking header for user.xxxx.Sent: Input/output error
Dec  5 09:54:47 mailhost imaps[26935]: IOERROR: locking index for user.xxxx: Input/output error
Dec  5 09:54:47 mailhost imaps[24013]: IOERROR: locking index for user.xxxx: Input/output error
Dec  5 09:54:47 mailhost imaps[15672]: IOERROR: locking index for user.xxxx: Input/output error
Dec  5 09:54:47 mailhost imaps[3999]: IOERROR: locking index for user.xxxx: Input/output error
Dec  5 09:54:47 mailhost imaps[30671]: IOERROR: locking index for user.xxxx: Input/output error

...................
Around 15 maiboxes are corrupted at each timeouts.
Manually, we can repair this mailbox:

  * first, we have to delete all cyrus files in mailbox, if not the
    following reconstruct can be blocked
  * then, we reconstruct the mailbox (reconstruct -s user.<NAME>.<FOLDER>

The downside of this method is that all messages in the reconstructed 
folder are marked 'Not seen'.
To automate this, a Python script has been written, but sometimes not 
all cyrus files (cyrus.index) are recreated:

Dec  5 01:03:53 mailhost lmtpunix[497]: IOERROR: opening /var/spool/imap/x/user/xxxxxx/cyrus.index: No such file or directory

Timeouts happen about 3 times per day, and cyrus deliver process is 
blocked when delivering to a corrupted mailbox.
So my first question is : how can we reconstruct a mailbox without 
marking mails as not seen?
And my second question is : why cyrus files are not recreated everytime? 
Is this due to the -s parameter with reconstruct?

Any help will be appreciated.

Thanks

------------------

Ismael TANGUY

-- 
<http://www.univ-brest.fr>


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