Hello, I'm trying to migrate from maildir++ to mdbox. The maildir++ is a leftover of our previous setup (was using courier)

We have 3 virtuals servers for our +70000 accounts.

Now, I'd like to use mdbox, so I'm trying using dsync for that. I setup a new virtual server, configured for mdbox.

1st, I tried a basic setup: I established a file with all my accounts (taken from LDAP) and then I use this script :

FILENAME=$1

while read LINE do

dsync -u $LINE backup $LINE@my_new_server

done < $FILENAME

But it's quite slow and dsync hangs.

So I tried another approach using multi threaded python.

Much faster (using all the cores), but dsync still hangs on some accounts. After a certain time dsync exit with an error like that :

Panic: file dsync-worker-local.c: line 1688 (local_worker_save_msg_continue): assertion failed: (ret == -1) dsync-remote(E072184L): Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0x3fd8a) [0x7f34fc577d8a] -> /usr/lib/dovecot/libdovecot.so.0(default_fatal_handler+0x32) [0x7f34fc577e72] -> /usr/lib/dovecot/libdovecot.so.0(i_error+0) [0x7f34fc55119f] -> dsync() [0x40ff0b] -> dsync() [0x410142] -> dsync(dsync_worker_msg_save+0x99) [0x40f639] -> dsync() [0x40e24a] -> dsync() [0x40d8ef] -> dsync() [0x40dbfc] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x48) [0x7f34fc5830d8] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x9f) [0x7f34fc58403f] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x28) [0x7f34fc583068] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f34fc5713a3] -> dsync(main+0x9e1) [0x4078b1] -> /lib/libc.so.6(__libc_start_main+0xfd) [0x7f34fbde9c4d] -> dsync() [0x406cf9]

This is on a RUNNNING server.

My aim was to make some pass on the running server, then stop it and make a last pass to finish the process.

Is dsync supposed to run only on a stopped server ?

Is my approach totally wrong ?

-- Yann Dupont - Service IRTS, DSI Université de Nantes Tel : 02.53.48.49.20 - Mail/Jabber : Yann.Dupont@univ-nantes.fr