Hi Wilfredo ,
if you are sure that problem with throughput is in tapes you should check
tapeiobufs setting in your server
confiruration file - you can speed up tape processing if you are ready to
use some extra memory.
I recommend to check q db f=d - cache hit and region size in the same time.
regards
Petr
----- P�vodn� zpr�va -----
Od: "Castillo, Wilfredo" <[EMAIL PROTECTED]>
Komu: <[EMAIL PROTECTED]>
Odesl�no: 13. b�ezna 2001 18:10
P�edm�t: Re: Transfer rate in TSM 4.1 OS/390
> Adolph, the drives are Escon connections. We have two (2) channels to the
> controller. There is not anyone using
> the tape drives at the same time.
>
> Thanks again
> ---------------------- Remitido por WILFREDO CASTILLO/CASTILLOWU/INS/PDVSA
con
> fecha 13/03/2001 13:07 ---------------------------
>
>
> [EMAIL PROTECTED] con fecha 13/03/2001 11:34:00
> Destinatarios: [EMAIL PROTECTED]@Internet
> CC: (cci: WILFREDO CASTILLO/CASTILLOWU/INS/PDVSA)
>
> Asunto: Re: Transfer rate in TSM 4.1 OS/390
>
> Wilfredo, then you need to look at how the drives are connected Escon or
> Ficon - how many connections to the controller. Was anything else using
tape
> drives at the same time?
>
> I'm seeing rates around 20MB/sec which after compression would be about
> 7-8MB/sec.
>
> Adolph
> ----- Original Message -----
> From: "Castillo, Wilfredo" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, March 13, 2001 9:24 AM
> Subject: Re: Transfer rate in TSM 4.1 OS/390
>
>
> > Thanks Adolph,
> >
> > The drives are 3590 E and I am using drives hardware compression.
> >
> > Wilfredo
> >
> >
> >
> >
> >
> > [EMAIL PROTECTED] con fecha 13/03/2001 10:02:00
> > Destinatarios: [EMAIL PROTECTED]@Internet
> > CC: (cci: WILFREDO CASTILLO/CASTILLOWU/INS/PDVSA)
> >
> > Asunto: Re: Transfer rate in TSM 4.1 OS/390
> >
> > You didn't mention which model of 3590 drive. The B models have a
maximum
> > native transfer rate of 9MB/sec and the E's have a maximum of 14MB/SEC.
> How
> > are the drives attached to your OS/390 system? Are you using TSM
> compression
> > or are you using the drives hardware compression? These can all impact
> your
> > throughput.
> >
> > Adolph
> >
> >
> > ----- Original Message -----
> > From: "Castillo, Wilfredo" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Tuesday, March 13, 2001 8:13 AM
> > Subject: Transfer rate in TSM 4.1 OS/390
> >
> >
> > > Anyone know about the highest transfer rate in TSM 4.1 OS/390 Server
> from
> > OMVS
> > > Client through IBM 3494 Magstar 3590?. I have done some tests. The
> highest
> > > transfer rate that I have reached is 5MB/sec. Is it the maximum?
> > >
> > > I appreciate your help,
> > >
> > > Wilfredo Castillo
> > > Data Center
> > > Intesa - Caracas, Venezuela
> > >
> > >
> > >
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