Hello,
When I look at email files on my server (mdbox format), they contain
random LZ4 stuff. I have now changed the compression to gzip and new
mails look cleaner. But older ones have problems.
A mail file looks like this:
2 M1e C5655b6a8
^A^BN 00000000000006F4
Dovecot-LZ4^M*<9B><C5>^@^A^@^@^@^@^F<DD><FF><83>Return-path:
<nobody at winnie.projecthoneypot.org>
Envelope-to: nikademus at llorien.org
Delivery-date: Mon, 22 Nov 2004 09:50:58 +0100
Received: from }^@^G<F7>
[66.135.39.84]
by mail.}^@<FF>< with esmtp
(TLS-1.0:DHE_RSA_3DES_EDE_CBC_SHA:24)
id=1CW9uQ-0002gj-El
for<DE>^@^C^_;<D0>^@8<B1>(localhost.
^@<F1>^Ddomain
[127.0.0.1])<E5>^@^O^S^A^H<82>(8.12.8/^G^@^R)<FF>^@<F2>^HESMTP
id
iAM9gl4l021209<D6>^@^_<<D7>^@^B^_><D8>^@^A<B9>3:42:47
-06<A8>^Ac(from
-^B^A<BA>^@Ohost<AC>^@^\<86>/Submit)<A8>^@!cd<A8>^@N7;
4^B
<8C>^@^_DZ^B^D
&^@<F2>^KMessage-Id: <200411220942.^Y^A^Dq^@^O<F1>^B
<FF>^BTo: Renaud AllardB^A^E<B2>
Then, I randomly see errors like this in maillog: truncated lz4 chunk at
555395
Given I am still able to read the mails using imap, I think there might
be a way to recover them to a proper format.
However, using dsync to make a mirror throws a lot of errors like below.
# dsync -v -u recover -o "mail_plugins=zlib" mirror dbox:~/ndbox
dsync(recover): Error: lz4.read(//home/vmail/recover/mdbox/storage/m.2):
corrupted lz4 chunk at 43551
dsync(recover): Error:
write(/home/vmail/recover/ndbox/mailboxes/INBOX/dbox-Mails/.temp.1448464321.P24341Q6M965521.isildur.arnor.org)
failed: Invalid argument
dsync(recover): Error: copy:
i_stream_read(zlib(//home/vmail/recover/mdbox/storage/m.2)) failed:
read(//home/vmail/recover/mdbox/storage/m.2) failed:
lz4.read(//home/vmail/recover/mdbox/storage/m.2): corrupted lz4 chunk at
43551
dsync(recover): Error:
read(zlib(//home/vmail/recover/mdbox/storage/m.2)) failed:
read(//home/vmail/recover/mdbox/storage/m.2) failed:
lz4.read(//home/vmail/recover/mdbox/storage/m.2): corrupted lz4 chunk at
43551 (uid=42028, box=INBOX)
dsync(recover): Error: Mailbox INBOX: read(msg input) failed:
read(//home/vmail/recover/mdbox/storage/m.2) failed:
lz4.read(//home/vmail/recover/mdbox/storage/m.2): corrupted lz4 chunk at
43551
dsync(recover): Error:
read(zlib(//home/vmail/recover/mdbox/storage/m.2)) failed:
read(//home/vmail/recover/mdbox/storage/m.2) failed:
lz4.read(//home/vmail/recover/mdbox/storage/m.2): corrupted lz4 chunk at
43551 (uid=42028, box=INBOX)
dsync(recover): Error:
unlink(????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????)
failed: No such file or directory
dsync(recover): Error:
unlink(????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????//home/vmail/recover/mdbox/mailboxes/Drafts/dbox-Mails/dovecot.index.log.2)
failed: No such file or directory
dsync(recover): Error: unlink(Internal error occurred. Refer to server
log for more information. [2015-11-25 16:12:01]) failed: No such file or
directory
dsync(recover): Error:
unlink(????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????)
failed: No such file or directory
dsync(recover): Error:
unlink(????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????)
failed: File name too long
dsync(recover): Error: unlink(Internal error occurred. Refer to server
log for more information. [2015-11-25 16:12:01]) failed: No such file or
directory
Any help welcome
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