On 1.05.2010 00:32, Timo Sirainen wrote:
v1.2 dbox is similar to v2.0's dbox, but not identical. v2.0 dbox is simpler
and faster. Also dbox and mdbox are different, although they share some code.
http://wiki.dovecot.org/MailboxFormat/dbox
Anyway, v2.0 is supposed to be able to read v1.2's dbox, but 1) I haven't
tested it recently and 2) that's only if the dbox doesn't contain any
maildir-migration files (so all mail files are u.* files, no maildir files).
I'm kind of hoping the dbox/maildir hybrids aren't all that popular and maybe I
don't need to worry about them.. :)
I have done some test here.
1st. There is some problem with imap + quota plugin. the corresponding logs:
May 1 03:46:33 rho2 dovecot: imap(lu...@test.dpv.bg): Panic: file
index-transaction.c: line 145 (index_transaction_rollback): assertion
failed: (box->transaction_count > 0 || box->view->transactions == 0)
May 1 03:46:33 rho2 dovecot: imap(lu...@test.dpv.bg): Raw backtrace:
/usr/lib/dovecot/libdovecot.so.0 [0x7f6e230114c2] ->
/usr/lib/dovecot/libdovecot.so.0 [0x7f6e2301152a] ->
/usr/lib/dovecot/libdovecot.so.0(i_error+0) [0x7f6e230118d3] ->
/usr/lib/dovecot/libdovecot-storage.so.0 [0x7f6e232c0d24] ->
/usr/lib/dovecot/modules/lib10_quota_plugin.so [0x7f6e21294021] ->
/usr/lib/dovecot/modules/lib10_quota_plugin.so [0x7f6e21293a90] ->
/usr/lib/dovecot/libdovecot-storage.so.0(sdbox_sync_begin+0x45e)
[0x7f6e232c2bee] ->
/usr/lib/dovecot/libdovecot-storage.so.0(sdbox_transaction_save_commit_pre+0x70)
[0x7f6e232c33f0] -> /usr/lib/dovecot/libdovecot-storage.so.0
[0x7f6e232c1138] ->
/usr/lib/dovecot/libdovecot-storage.so.0(mail_index_transaction_commit_full+0x97)
[0x7f6e23290957] ->
/usr/lib/dovecot/libdovecot-storage.so.0(index_transaction_commit+0x8b)
[0x7f6e232c0dbb] -> /usr/lib/dovecot/modules/lib10_quota_plugin.so
[0x7f6e212940a4] ->
/usr/lib/dovecot/libdovecot-storage.so.0(mailbox_transaction_commit_get_changes+
May 1 03:46:33 rho2 dovecot: master: service(imap): child 5621 killed
with signal 6 (core dumps disabled)
May 1 03:46:33 rho2 dovecot: imap(lu...@test.dpv.bg): dbox: File
unexpectedly lost:
/var/www/149444/mail/122-dbox/mailboxes/INBOX/dbox-Mails/u.3226
...
So I have disabled all imap plugins except autocreate and have run the
dbox/mdbox
test with dovecot v2.0b4 and with v1.2.11. Here are the results:
nologout 10 1111 1036 10 2111 3071 755 1680 2111 2111 1.2.11 dbox
logout 544 272 263 542 538 753 191 426 538 540 1088 1.2.11 dbox
nologout 10 1182 1182 10 2367 3389 808 1919 2367 2367 2.0b4 dbox
logout 531 266 265 529 517 720 76 414 517 526 1072 2.0b4 dbox
nologout 10 1074 1012 10 2087 3045 725 1622 2087 2087 2.0b4
mdbox
logout 504 265 242 503 491 660 135 397 491 502 1012 2.0b4
mdbox
So, on this test setup, there is no much difference between dbox/mdbox.
May be in other
setups it will show differend results. I have seen differend comparison
proportions
using diffened servers (pre-core 64bit xeons vs core2-quad) even when
using the same
storage and filesystem.
When v2 stabilizes, I will consider migrating for the greater
flexibility (altstorage,
LMTP etc.)
Best regards and thanks for the great work
luben
