Veritas-bu

[Veritas-bu] Backing up Solaris 9 submirrors

2005-08-03 11:56:07
Subject: [Veritas-bu] Backing up Solaris 9 submirrors
From: pkeating AT bank-banque-canada DOT ca (Paul Keating)
Date: Wed, 3 Aug 2005 11:56:07 -0400
And in my experience, most folks splitting mirrors for backups prefer to
use a 3rd plex, otherwise you end up running without disk redundancy for
the duration of the backup.

Paul

> -----Original Message-----
> From: Charles Ballowe [mailto:cballowe AT gmail DOT com] 
> Sent: August 3, 2005 11:02 AM
> To: dave.markham AT fjserv DOT net
> Cc: Paul Keating; Veritas List
> Subject: Re: [Veritas-bu] Backing up Solaris 9 submirrors
> 
> 
> It backs them up as they are when the backup happens. If you're
> dealing with oracle databases, something should either put the
> database into backup mode or shut it down completely before doing a
> backup. In backup mode, you need to get the archive logs last, and
> should pick up a backup of the control file. ... or use the Oracle
> agent and exclude the database files all together. Other databases
> pose similar problems.
> 
> If you do regular restore tests of your databases, you should be more
> than fine with your backup methods - remember that a backup is no good
> unless you can restore from it.
> 
> The split mirror backups are a good way in an extremely high
> availability environment to get a cold database backup and minimize
> database downtime - shutdown the database, split the mirror, bring up
> the database and backup the split copy while operations continue as
> normal.
> 
> It's far from normal - but it gives people comfort in some 
> environments.
> 
> -Charlie
> 
> On 8/3/05, Dave Markham <dave.markham AT fjserv DOT net> wrote:
> > Paul Keating wrote:
> > 
> > >You're likely doing "normal" backups, and not trying to 
> backup a split
> > >mirror.
> > >
> > >Some cases when you might backup a split mirror would be 
> if you want to
> > >back up a database, or directory, ensuring youo're getting 
> all files in
> > >sync. You would quiesce any processes using the disk, then 
> split off the
> > >mirror......the database or application would continue 
> running on the
> > >original plex, and you could backup the plex that was 
> split off without
> > >fear of an application tweaking the data during the backup.
> > >
> > >Paul
> > >
> > >
> > >
> > >>-----Original Message-----
> > >>From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> > >>[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of
> > >>Sean Clarke
> > >>Sent: August 2, 2005 6:40 PM
> > >>To: 'BeDour, Wayne'; 'Veritas List'
> > >>Subject: RE: [Veritas-bu] Backing up Solaris 9 submirrors
> > >>
> > >>
> > >
> > >
> > >
> > >>I don't understand this, we have an environment with a
> > >>Solaris Master, a
> > >>mixture of Solaris and HP-UX media servers and backup 
> Solaris, HP-UX,
> > >>Linux and Windows clients without having to resort to 
> this. Surely the
> > >>Netbackup processes on the Client are the only things 
> that really need
> > >>to understand it's filesystem. By the time you get to the 
> Media/Master
> > >>server, surely you are just writing tar files?
> > >>
> > >>Have I missed something?
> > >>
> > >>
> > >
> > >_______________________________________________
> > >Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> > >http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> > >
> > >
> > >
> > I may sound daft, but is this normal? I backup unix systems and am
> > worrying now data i backup may not be worth much.
> > 
> > How does netbackup handle open files or files which are 
> being written
> > to? Does it just not back them up and give a status 1 ( 
> because i dont
> > have many status 1 at all ) or does it back it up and lock it?
> > 
> > Cheers
> > Dave
> > _______________________________________________
> > Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
> 
>