[Dovecot] dsync error: "Mailboxes don't have unique GUIDs"

[Doug Henderson]

Hey, just a point of clarification.

In at least some of the cases (possibly all, I'll leave that up to Jeff to state) an initial dsync (as documented in Jeff's message) was completed successfully and the problem occurred when we ran a second (using exactly the same cmd) time to catch any changes since the original sync (since the initial sync took many hours).

Doug

On Jun 22, 2012, at 2:24 PM, Jeff Gustafson wrote:

> 	I'm getting an error backing up mailboxes. I'm using the mirror
> command:
> 
> dsync -fvo mail_home=/home/users/bob mirror ssh vmail at 10.1.4.1 dsync -o
> mail_home=/home/.incoming_mail_migrations/users/bob
> 
> dsync-remote(vmail): Error: Mailboxes don't have unique GUIDs:
> 1ef6ee37c694894d783100000581a675 is shared by INBOX and INBOX
> dsync-remote(vmail): Error: command BOX-LIST failed
> dsync-local(vmail): Error: Worker server's mailbox iteration failed
> 
> 	The mail user doesn't yet exist on the destination yet, thus the use of
> the mail_home parameter.
> 	I found a mailing list message where a person was having a similar
> problem but I couldn't find confirmation that the issue was resolved.
> 	In our case, the backup goes from maildir to mdbox format (we can't to
> convert to mdbox). Things seemed to be moving along, but there are quite
> a few examples of dsync failing. I think the issue happens more often
> with large mailboxes ( > 50GB ). 
> 	We're running version 2.0.13. 
> 	doveconf -n:
> 
> # 2.0.13: /etc/dovecot/dovecot.conf
> # OS: Linux 2.6.18-274.12.1.el5 x86_64 CentOS release 5.7 (Final) 
> auth_mechanisms = plain login
> default_client_limit = 15000
> default_process_limit = 10000
> disable_plaintext_auth = no
> listen = *
> mail_gid = vmail
> mail_location = maildir:~/Maildir
> mail_plugins = zlib
> mail_uid = vmail
> mmap_disable = yes
> namespace {
>  inbox = yes
>  location = 
>  prefix = INBOX.
>  separator = .
> }
> passdb {
>  args = /etc/dovecot/conf.d/dovecot-sql.conf.ext
>  driver = sql
> }
> plugin {
>  zlib_save = gz
> }
> protocols = imap pop3
> service auth {
>  client_limit = 10000
>  unix_listener auth-userdb {
>    mode = 0666
>  }
> }
> service imap-postlogin {
>  executable = script-login /usr/bin/postlogin-imap.sh
>  user = $default_internal_user
> }
> service imap {
>  drop_priv_before_exec = yes
>  executable = imap
>  process_limit = 10000
> }
> service pop3-postlogin {
>  executable = script-login /usr/bin/postlogin-pop.sh
>  user = $default_internal_user
> }
> }
> service pop3 {
>  drop_priv_before_exec = yes
>  executable = pop3
>  process_limit = 2500
> }
> ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
> ssl_key = </etc/pki/dovecot/private/dovecot.pem
> userdb {
>  driver = prefetch
> }
> userdb {
>  args = /etc/dovecot/conf.d/dovecot-sql.conf.ext
>  driver = sql
> }
> protocol lmtp {
>  mail_plugins = zlib
> }
> protocol lda {
>  mail_plugins = zlib
> }
> protocol imap {
>  mail_max_userip_connections = 100
>  mail_plugins = zlib
> }
> protocol pop3 {
>  mail_max_userip_connections = 30
>  mail_plugins = zlib
> }
> 
> 
> ...Jeff
>