The 15MB/sec natively (30 MB/sec compressed) rates apply to the tapes streaming
speed.  The actual speed under TSM has been shown to be 12.8 MB/second
uncompressed and 15.3 MB/second with 3:1 compression.  These numbers come form
an IBM LTO Ultrium Performance Consulting Report date: August 23, 2000..  My
math may be flawed but I show that, with a rate of 15.3 MB/second, a backup of
600 GB is going to take over 11 hours.

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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