Richard,

Are you using all the 8 drives of LTO? When the backup is running you type q
mount, how many drives you see mounted?
On init<SID>.utl, which values are you using for multiplex and maxsessions?
On gigabit ethernet, are you using jumb frames?
On iostat how's the tm-act column?

Regards,

Anderson

> It's not an SSA array, it's a JBOD in mirror.
> I can't give you more machine details alas (customer confidential). The
only details I can give you are:
>
>         RS/6000 model F80
>         2 CPU
>         1 GB memory
>         SAP DB size 100GB on SSA disks (JBOD with mirroring)
>         3584 LTO with 8 LVD drives
>         TSM server 4.2.1.8
>         TSM client 4.2.1.15
>         TDP for R/3 3.2.0.6
>
> Richard.
>
> -----Original Message-----
> From: James Thompson [mailto:mezron AT HOTMAIL DOT COM]
> Sent: Wednesday, February 13, 2002 4:30 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: LTO strange behaviour
>
>
> You mention 20 MB/sec and that the SAP database is on an SSA array.   Well
> some SSA array's have a maximum throughput of 20 MB/sec. This depends on
the
> adapter, and how you have the SSA array configured.
> It would be nice to get the machines hardware configuration more
completely.
>
> Also have you benchmarked your SSA array to see what maximum throughput it
> can sustain.   If you are running 8 streams of backup through one SSA
> adapter, you could run into contention.
>
> James Thompson
>
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