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Re: [Bacula-devel] Can bacula change the ctime on files during a backup?


On Wednesday 06 August 2008 18:53:10 Hemant Shah wrote:
> --- On Tue, 7/22/08, Hemant Shah <hjrrs@xxxxxxxxx> wrote:
> > From: Hemant Shah <hjrrs@xxxxxxxxx>
> > Subject: Re: [Bacula-devel] Can bacula change the ctime on files during a
> > backup? To: bacula-devel@xxxxxxxxxxxxxxxxxxxxx
> > Date: Tuesday, July 22, 2008, 3:27 PM
> > --- On Tue, 7/22/08, Kern Sibbald <kern@xxxxxxxxxxx>
> >
> > wrote:
> > > From: Kern Sibbald <kern@xxxxxxxxxxx>
> > > Subject: Re: [Bacula-devel] Can bacula change the
> >
> > ctime on files during a backup?
> >
> > > To: bacula-devel@xxxxxxxxxxxxxxxxxxxxx
> > > Date: Tuesday, July 22, 2008, 1:25 PM
> > >
> > > On Tuesday 22 July 2008 18:37:14 John Drescher wrote:
> > > > There is a long thread in the users list that a
> >
> > user
> >
> > > is getting nearly
> > >
> > > > full backups for his incrementals with
> >
> > bacula-2.4.X
> >
> > > and it was
> > >
> > > > discovered that the reason was that the ctime on
> >
> > files
> >
> > > was changing
> > >
> > > > between backups. He believes that bacula is doing
> >
> > this
> >
> > > but I am not so
> > >
> > > > sure.
> > >
> > > Almost anything is possible, but there have been no
> >
> > changes
> >
> > > in the way Bacula
> > > does backups for quite a few versions, so I doubt that
> > > Bacula is doing it.
> > > Typically it is virus protection software.
> > >
> > > If he can provide proof positive, i.e. disable all
> >
> > software
> >
> > > other than Bacula
> > > do a backup and show that file times change, then that
> > > might be worth looking
> > > at.  Also, if it is one user only one user having the
> > > problem, it points the
> > > finger elsewhere.  Finally, I am running 2.4.1 here
> >
> > and
> >
> > > have been since
> > > before it was released, and I am seeing normal
> >
> > Incremental
> >
> > > backups.
> > >
> > > Thanks for mentioning this ...  I'll take a look
> >
> > at the
> >
> > > thread.
> > >
> > > Best regards,
> > >
> > > Kern
> >
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> > > _______________________________________________
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> >
> > https://lists.sourceforge.net/lists/listinfo/bacula-devel
> >
> >
> >   I upgraded the server to 2.4.1. I will run another full
> > cycle starting today. I have also written a cronjob that
> > will run every hour and stat few files, some on local disk
> > and some on NFS filesystems. I am having problem on bacula
> > server so I will be running the script on bacula server
> > machine which only runs bacula, and postgresql.
> >
> >
> > Will see if I get problem with 2.4.1.
> >
> > Hemant Shah
> > E-mail: hjrrs@xxxxxxxxx
> >
> >
> >
> >
> >
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> > https://lists.sourceforge.net/lists/listinfo/bacula-devel
>
> Folks,
>
>   It did it again. Last weekend was another start of the month full backup,
> then it was time to to the incremental backup, bacula did a full or almost
> full backup again, only on some clients, and few were not same as last
> time.
>
> Here are the clients that had problem:
>
> -rw-r----- 1 root root 1.9G 2008-08-02 16:07 Full-lidp5-2008-08-02-15:46:51
> -rw-r----- 1 root root 1.8G 2008-08-03 22:23 Incr-lidp5-2008-08-03-22:03:06
> -rw-r----- 1 root root 3.7M 2008-08-04 22:02 Incr-lidp5-2008-08-04-22:02:33
> -rw-r----- 1 root root 3.0M 2008-08-05 22:03 Incr-lidp5-2008-08-05-22:03:05
>
>
> -rw-r----- 1 root root 19G 2008-08-02 17:39 Full-lidp8-2008-08-02-15:48:08
> -rw-r----- 1 root root 19G 2008-08-04 00:05 Incr-lidp8-2008-08-03-22:05:13
> -rw-r----- 1 root root 45M 2008-08-04 22:19 Incr-lidp8-2008-08-04-22:02:58
> -rw-r----- 1 root root 15M 2008-08-05 22:20 Incr-lidp8-2008-08-05-22:03:29
>
>
> -rw-r----- 1 root root 5.5G 2008-08-02 18:59
> Full-lidp10-2008-08-02-17:24:03 -rw-r----- 1 root root 3.7G 2008-08-03
> 23:28 Incr-lidp10-2008-08-03-22:05:34 -rw-r----- 1 root root  17M
> 2008-08-04 22:05 Incr-lidp10-2008-08-04-22:03:34 -rw-r----- 1 root root 
> 17M 2008-08-05 22:06 Incr-lidp10-2008-08-05-22:04:36
>
> -rw-r----- 1 root root  58G 2008-08-02 22:36
> Full-lidp11-2008-08-02-17:50:02 -rw-r----- 1 root root  56G 2008-08-04
> 02:52 Incr-lidp11-2008-08-03-22:12:39 -rw-r----- 1 root root 3.0G
> 2008-08-04 22:42 Incr-lidp11-2008-08-04-22:05:15 -rw-r----- 1 root root
> 3.8G 2008-08-05 22:52 Incr-lidp11-2008-08-05-22:05:37
>
>
> -rw-r----- 1 root root 6.4G 2008-08-02 21:22
> Full-lidp20-2008-08-02-19:30:22 -rw-r----- 1 root root 5.8G 2008-08-03
> 23:45 Incr-lidp20-2008-08-03-22:13:43 -rw-r----- 1 root root  30M
> 2008-08-04 22:15 Incr-lidp20-2008-08-04-22:07:51 -rw-r----- 1 root root 
> 30M 2008-08-05 22:16 Incr-lidp20-2008-08-05-22:08:27
>
> -rw-r----- 1 root root 6.7G 2008-08-02 21:56
> Full-lidp22-2008-08-02-21:09:01 -rw-r----- 1 root root 4.6G 2008-08-03
> 23:28 Incr-lidp22-2008-08-03-22:47:34 -rw-r----- 1 root root  19M
> 2008-08-04 22:18 Incr-lidp22-2008-08-04-22:15:49 -rw-r----- 1 root root 
> 19M 2008-08-05 22:19 Incr-lidp22-2008-08-05-22:16:27
>
>
> I am backing up 26 clients (AIX, HP-UX, Linux, Win2k server), problem only
> occurs on some clients, and they are not same clients every time. The
> problem has never occured on a AIX or windows client.
>
> I am also running veritas netbackup in parallel (my old backup system). I
> am  reluctantly attributing the problem to the netbackup, because if
> netbackup changes ctime why doesn't it change it on all the systems and why
> not same systems every time. In many cases bacula does almost full backup,
> if netbackup is changing ctime it would change it on all files and bacula
> would backup all files too.

Perhaps there is some configuration parameter that is not set correctly, and 
when it references the files, it does not always reset the time/date 
correctly on some particular backup level ...

I would recommend that you talk to Veritas about the problem without 
mentioning Bacula.  Unless you configure Bacula differently, it checks both 
mtime and ctime, so if netbackup modified either one of them, Bacula would 
treat the file as having changed.  If you configure Bacula differently, you 
can make it ignore ctime changes.

One thing you could do (perhaps some bacula-users list guys can help if you 
need it) is to run a Bacula verify InitCatalog on one or more of the affected 
systems just before running netbackup then after you run netbackup run a 
verify catalog to see what files have changed.  You can set the parameters of 
the verify to compare only mtime and ctime.  That way, you can definitively 
determine whether or not netbackup is modifying anything on your system.

>
> I will have to wait for few more months before I shutdown netbackup system
> and run only bacula. If the problem goes away after that then I will know
> it was netbackup.

I'll be *very* surprised if it turns out to be related to Bacula itself as 
this is such a fundamental problem that it surely would have shown up on a 
good number of other user's systems, which is not the case.

>
> I am running bacula 2.4.2 on server (fc9 64-bit) and all the clients are at
> 2.2.8.

The 2.2.8 clients should be 100% compatible with 2.4.2, but I always recommend 
that you upgrade as soon as possible ...

Best regards,

Kern


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