Re: [Bacula-users] Mail Server Incremental Backup size of full backup
2008-09-05 05:29:00
Hemant Shah escribió:
--- On Wed, 9/3/08, Alberto Rial <rial AT ardan DOT es> wrote:
From: Alberto Rial <rial AT ardan DOT es>
Subject: Re: [Bacula-users] Mail Server Incremental Backup size of full backup
To: "Mark Nienberg" <gmane AT tippingmar DOT com>
Cc: bacula-users AT lists.sourceforge DOT net
Date: Wednesday, September 3, 2008, 2:13 AM
Mark Nienberg escribió:
Alberto Rial wrote:
I have a mail server running Debian 4.0 and
bacula version
2.2.8-8~bpo40+1 installed from debian backports.
The mail server runs
postfix + courier-imap and size of full backup
it´s 108 Gb aprox.
I´ve got a lot of machines on the network who
are been backed up
succesfully, but the mail server sometimes when
run a incremental
backup, it´s seems to be an incremental but
bacula copy all data like in
a full.
If you store your mail messages in traditional unix
mbox format then any new messages
or deleted messages for one user will change the mbox
file for that user and the
backup will include all of that user's mail (since
it is all in one file).
To get true incremental backups for user mailboxes you
would need to use one of the
formats that stores messages as individual files, like
Maildir.
Is that the problem or do you already use Maildir
format?
Mark Nienberg
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I´m aleady using Maildir format... Some of the
incremental backups runs
fine (about 700 Mb of daily changes) while some of them
(generally
sunday night incremental) has the same size that a full
backup (about
108 gb). If I delete this backup (Incremental with full
size) next
backup size will be 108 gb, if i don´t delete it next
backup runs fine
(about 700 mb).
Thanks.
Alberto Rial.
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It looks like some process that runs on Sunday changes ctime of the files. I had similar problem where my old backup system (Veritas NetBackup) and bacula were running together for few months and Veritas would change ctime of the file because it was resetting the atime of the file and bacula would back it up even though it did not change. Many of my incremental backups were the size of full backup.
Hemant Shah
E-mail: hjrrs AT yahoo DOT com
Mmm I was looking if some process changed ctime of files but i didnt
find anything. I The atime (access time) changes becouse it´s an IMAP
e-mail server, users access their mail from their desktops but it´s
stored on mail server. It´s not a procces on sunday, becouse it
happens sometimes, take a look at a resume of backups of e-mail server:
Terminated Jobs:
JobId Level Files Bytes Status Finished Name
======================================================================
4187 Incr 695,641 107,892,462,347 OK 27-ago-08 07:04 mail
4312 Incr 16,515 411,294,291 OK 27-ago-08 23:20 mail
4421 Incr 17,640 410,300,655 OK 29-ago-08 00:21 mail
4524 Full 698,476 108,204,208,184 OK 31-ago-08 02:34 mail
4533 Incr 697,872 108,199,519,284 OK 31-ago-08 11:25 mail
4542 Incr 187,939 13,029,677,742 OK 01-sep-08 00:00 mail
4668 Incr 697,746 108,169,211,334 OK 02-sep-08 07:17 mail
4794 Incr 698,008 108,197,912,954 OK 03-sep-08 07:25 mail
4919 Incr 8,921 511,619,657 OK 03-sep-08 23:21 mail
5028 Incr 18,304 530,161,167 OK 04-sep-08 23:21 mail
====
Sometimes works fine and sometimes not. I´m lost in configuration :P
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