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If you've taken a look at BackupExec they have totally redone the backup =
to
folders.
You can specify how big and how many images to store per folder.=20
Gets around any filesystem limitations.=20
Sort of what you would expect of a tape drive. You can span images.
I haven't used it so I can't tell if it works.
I suspect NBU 6 will look similar.

Jim

-----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 Ed Wilts
Sent: Friday, April 15, 2005 8:36 AM
To: Kathryn Hemness
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Disk storage staging unit groups, anyone?


On Fri, Apr 15, 2005 at 08:07:10AM -0700, Kathryn Hemness wrote:
> I am in the process of setting up a 2TB disk "staging" storage unit.=20
> Because Solaris has a 1TB filesystem limit for I had to set up 3=20
> partitions which I then defined as individual storage units in a=20
> storage unit group.  I have tried both the disk-staged storage unit=20
> and the disk storage unit using locally written scripts.

If you're using Veritas File system, then check
http://seer.support.veritas.com/docs/248416.htm
For UFS, check =
http://docs.sun.com/app/docs/doc/817-3801/6mjcck32j?a=3Dview=20
Solaris 9 added suppport for muliterabyte file UFS volumes.

> What happens is that when the initial storage unit gets full, the=20
> currently active backups using the unit fail with a media write error=20
> and will not continue onto the other available disk storage units.

You need to schedule your jobs to write to tape more frequently.
>=20
> With the disk-staged storage units, the staging from disk to tape was=20
> immediate, but the expiration and removal of the disk image was not,=20
> and this behavior is not configurable (I have no idea how NetBackup=20
> determine that the storage unit is full to let the expiration and=20
> removal commence).

The images stay on disk for as long as possible and this is actually =
what
you want so that restores are quicker.  NetBackup is quite happy to have
images on both disk and tape and will restore from the right place. =
However,
you need to ensure that the images have made it to tape so that the =
images
can be deleted from disk when needed.

> Needless to say, I'm disappointed that Veritas released such=20
> inflexible storage unit options without any mention of the known=20
> limitations. Right now, I'm finding disk storage units to be an=20
> administrative nightmare.

The whole DSSU stuff is fairly new and I've heard that there will be
significant changes for NBU 6.0.  It's better than nothing right now and =
as
long as we understand the limitations, we can work with it.  It's
prefererable to not having them at all (which is your option too, btw).

> I do have to say that disk storage units would have been much less of=20
> a nightmare if I were not limited to a 1TB filesystem size (a=20
> restriction which will be removed in Solaris 10) and if the storage=20
> array were large enough to hold more than 1 days' worth of backups (a=20
> limitation caused my a very small budget).

As I mentioned above, an upgrade to Solaris 9 will be enough.=20

--=20
Ed Wilts, Mounds View, MN, USA
mailto:ewilts AT ewilts DOT org _______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

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