Gil,
We work with defered mode. It looks as if the copy is not the cause
for the problem.
The local VTS is defined as preferred VTS for every local VTC
(and the same way for the remote ones).
We would like to interfere in allocation process and make balance
between the VTCs (num of allocated devices per each).
Does any one know if SSI #24 & #78 get control when
allocaing vts tape devices ?
I would also like to learn from your experience about peak xfert rates
of B20 vts (per vtc/channel) and how many channels do you use
(withqwithout ESCON DIRECTOR) ?
Regards,
Hanan Hassan
Systems - z/OS Technical Support
Mehish, 15 Lincoln, 67134 Tel-Aviv, Israel
ph: +972-3-5634352, fx: +972-3-5623717
----- Original Message -----
From: "Gil Peleg" <[EMAIL PROTECTED]>
Newsgroups: bit.listserv.ibm-main
To: <[email protected]>
Sent: Thursday, August 11, 2005 8:34 AM
Subject: Re: VTS allocation & performance problems
Hanan,
What copy mode are you working with the VTS PtP, Immediate or Deferred? You
might consider using deferred copy mode and maybe change the priority the
VTS gives the copy operation.
It is possible to setup the VTC to prefer specific VTS for I/O. You can
also force scratch mounts to the preferred I/O VTS. This is called I/O VTS
Preferencing.
Gil.
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