[Dovecot] Dovecot 1.x on AIX -> Dovecot 2.x on Ubuntu

[root at yuma.acns.colostate.edu]

We are working on migrating Dovecot 1.2.17 running on AIX 5.3 (believe it
or not!) to Dovecot 2.0.13 running on Ubuntu.  We have hundreds of users
mboxes we will be migrating.  My question is regarding the index files.
Should we remove those after the migration, but before we open it up to
users so Dovecot can create new ones?

I did a test migration of a single user, and Dovecot detects the
architecture change and put out some panic errors, corrupt files and
backtrace messages in syslog on Ubuntu.  The messages are shown below.  If
every user is going to generate these types of errors, I'm thinking maybe
it makes sense to remove all the .imap directories and let Dovecot create
new clean ones.  I realize that may slow things down for awhile while
Dovecot is rebuilding new files.

Thanks for any info.

Jackie Hunt
Acad Computing & Networking Srvcs
Colorado State University

Jun  6 13:43:02 newlamar dovecot: imap-login: Login: user=<cacti>,
method=PLAIN, rip=129.82.100.64, lip=129.82.100.124, mpid=19593, TLS
Jun  6 13:43:21 newlamar dovecot: imap-login: Login: user=<cacti>,
method=PLAIN, rip=129.82.100.64, lip=129.82.100.124, mpid=19597, TLS
Jun  6 13:43:21 newlamar dovecot: imap-login: Login: user=<cacti>,
method=PLAIN, rip=129.82.100.64, lip=129.82.100.124, mpid=19600, TLS
Jun  6 13:44:11 newlamar dovecot: imap(cacti): Disconnected: Logged out
bytes=107/441
Jun  6 13:44:11 newlamar dovecot: imap(cacti): Disconnected: Logged out
bytes=1676/2724868
Jun  6 13:44:11 newlamar dovecot: imap(cacti): Disconnected: Logged out
bytes=129/759
Jun  6 13:51:49 newlamar dovecot: imap-login: Login: user=<cacti>,
method=PLAIN, rip=129.82.100.64, lip=129.82.100.124, mpid=19657, TLS
Jun  6 13:51:49 newlamar dovecot: imap(cacti): Error: Rebuilding index
file /adhome/cacti/.imap/INBOX/dovecot.index: CPU architecture changed
Jun  6 13:51:58 newlamar dovecot: imap-login: Login: user=<cacti>,
method=PLAIN, rip=129.82.100.64, lip=129.82.100.124, mpid=19662, TLS
Jun  6 13:51:58 newlamar dovecot: imap(cacti): Error: Corrupted
transaction log file /adhome/cacti/.imap/Trash/dovecot.index.log seq
16777216: log file shrank (1428 < 6144) (sync_offset=6144)
Jun  6 13:51:58 newlamar dovecot: imap(cacti): Panic: file buffer.c: line
295 (buffer_set_used_size): assertion failed: (used_size <= buf->alloc)
Jun  6 13:51:58 newlamar dovecot: imap(cacti): Error: Raw backtrace:
/usr/lib/dovecot/libdovecot.so.0(+0x374fa) [0x7f3ada59c4fa] ->
/usr/lib/dovecot/libdovecot.so.0(+0x3753e) [0x7f3ada59c53e] ->
/usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f3ada576837] ->
/usr/lib/dovecot/libdovecot.so.0(+0x35319) [0x7f3ada59a319] ->
/usr/lib/dovecot/libdovecot-storage.so.0(mail_transaction_log_file_open+0x21e)
[0x7f3ada87acee] ->
/usr/lib/dovecot/libdovecot-storage.so.0(mail_transaction_log_open+0xb8)
[0x7f3ada877a68] ->
/usr/lib/dovecot/libdovecot-storage.so.0(mail_index_open+0xe5)
[0x7f3ada860e75] ->
/usr/lib/dovecot/libdovecot-storage.so.0(index_storage_mailbox_open+0xbc)
[0x7f3ada826eac] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0x5f7fb)
[0x7f3ada8417fb] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0x28c4c)
[0x7f3ada80ac4c] ->
/usr/lib/dovecot/libdovecot-storage.so.0(index_storage_mailbox_enable+0x24)
[0x7f3ada827584] -> dovecot/imap(imap_status_get+0xfd) [0x7f3adacead8d] ->
doveco
 t/imap(cmd_status+0x182) [0x7f3adace1f92] -> dovecot/imap(+0x1105d)
[0x7f3adace405d] -> dovecot/imap(+0x11135) [0x7f3adace4135] ->
dovecot/imap(client_handle_input+0x125) [0x7f3adace4385] ->
dovecot/imap(client_input+0x65) [0x7f3adace4c35] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x48) [0x7f3ada5a8048] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0xa7)
[0x7f3ada5a90c7] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x28)
[0x7f3ada5a7fd8] ->
/usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f3ada5962c3]
-> dovecot/imap(main+0x2f4) [0x7f3adacdc544] ->
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7f3ada1e530d]
-> dovecot/imap(+0x95d5) [0x7f3adacdc5d5]
Jun  6 13:51:59 newlamar dovecot: imap-login: Login: user=<cacti>,
method=PLAIN, rip=129.82.100.64, lip=129.82.100.124, mpid=19664, TLS
Jun  6 13:51:59 newlamar dovecot: imap(cacti): Error: Transaction log file
/adhome/cacti/.imap/Trash/dovecot.index.log: marked corrupted
Jun  6 13:51:59 newlamar dovecot: imap(cacti): Error: Rebuilding index
file /adhome/cacti/.imap/Trash/dovecot.index: CPU architecture changed