How often will this take (the cold backup)?

You should have, a maximum, of 2 tape drives per SCSI connection(3 controllers).
Best to have 1 drive -> 1 SCSI controller.

The major bottleneck is the ability of the database to pump, at least 90MB(6 x 
15)
per second to the tape drives. There is also the consideration that the data
might not steadily stream to the tape drives (LTO start/stop characteristics not
that good).

Using a diskpool as a buffer would need, at least, twice the performance
characteristics of the tape stream rate above. It would ensure the tapes are
streaming but it would need to be very fast.

Don't forget to tell us a report how it ended up going.

Cheers, Suad
--
 Suad Musovich (s.musovich AT auckland.ac DOT nz)
 Suad Musovich (s.musovich AT auckland.ac DOT nz)
 Unix Support, ITSS Operations
 University of Auckland

On Wed, Feb 28, 2001 at 02:14:09PM +0200, Marc Layne wrote:
> Considering that each drive can handle 15MB/sec natively (30 MB/sec
> compressed) this relates to 54GB/hour per drive therefore 6 drives can do
> 324GB/hour natively or 600GB in two hours native speed. Yes the drive can
> handle it. The M80 also should be able to handle the load. The real question
> is whether you get TDP for oracle to multistream across all four drives.
> This sometimes depends on the database layout. If you have multiple smaller
> tablespaces or 1 or 2 large tablespaces. Also how much memory does the M80
> have?
>
> Thanks
> Marc
> _________________________________________________
> Marc Layne
> Product Manager - Services, Storage and Software Solutions
> Faritec
> Mobile: +27 82 4169086        email: mlayne AT faritec.co DOT za
> <mailto:mlayne AT faritec.co DOT za>
> Office:  + 27 21 7629702               http://www.faritec.co.za/
> _________________________________________________
>
>
> -----Original Message-----
> From: Shen Ou [mailto:shenou AT CN.IBM DOT COM]
> Sent: 28 February 2001 01:14
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: How long will be backup task finished ?
>
>
> My customer has a Oracle 8.1.6 database on IBM AIX M80 (4 CPU) and its size
> is 600G. He want to do a full backup using IBM LTO 3584 with 6 drivers. The
> LTO 3584 attach with M80 using SCSI 2 Line. TSM server and client are on
> M80 at the same time.He want to finish the backup task in 4 hours using TDP
> for oracle,TSM 4.1 and LTO device.
>
> My question is can he finish the backup task in four hours ?  If can't ,
> what's the bottleneck ?
>
> Thanks .
>
>    Shen Ou
>    Tivoli System
>    IBM China Shanghai Software Center
>
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