I thought the compression took place in the control unit, so the full
amount of data went over the escon channel, and was compressed by the
hardware before writing or reading. How does that triple the
effective tape rate to 27MB/sec. over the escon channel?
Over ESCON it does not, which is my
m, and well before I
became bleary-eyed.
Franz Josef Pohlen <[EMAIL PROTECTED]>
Sent by: IBM Mainframe Discussion List
05/16/2006 05:01 AM
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Re: question to backup on 3590
thank you all for your valuable
I get used equipment price lists monthly, from one of the last ones:
3590-A50 w/2 escon $675
3590-A60 w/2 escon $4700, 2 more escon $795
3590-B11 $3500
3590-E11 $4550
Rack mounting hardware for above $475
These are for example only, sent in email and not verified.
--
Franz Josef Pohlen wrote:
thank you all for your valuable answers. Another business partner told the
customer that a second escon channel is not possible on 3590. This I could
hardly believe because there was a feature code FC3312 called "second escon
adapter for 3590". Now I'm sure that the oth
artner is wrong.
Franz Josef
> --- Ursprüngliche Nachricht ---
> Von: "Pommier, Rex R." <[EMAIL PROTECTED]>
> An: IBM-MAIN@BAMA.UA.EDU
> Betreff: Re: [IBM-MAIN] question to backup on 3590
> Datum: Mon, 15 May 2006 17:11:00 -0500
>
> Eric,
>
> Bruce is
ailto:[EMAIL PROTECTED] On
Behalf Of Eric N. Bielefeld
Sent: Monday, May 15, 2006 5:07 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: question to backup on 3590
Bruce,
I thought the compression took place in the control unit, so the full
amount
of data went over the escon channel, and was compressed b
Bruce,
I thought the compression took place in the control unit, so the full amount
of data went over the escon channel, and was compressed by the hardware
before writing or reading. How does that triple the effective tape rate to
27MB/sec. over the escon channel?
Eric Bielefeld
Sr. z/OS Sy
Well, it's very old technology. If you have the channels on the
processor, add one, the cost of channels is probably the largest item.
You could probably add another A50 and a pair of B11 drives for very
little, the shipping, installation and maintenance will exceed their
value.
-
Bruce Black" <[EMAIL PROTECTED]>
Newsgroups: bit.listserv.ibm-main
To:
Sent: Monday, May 15, 2006 3:46 PM
Subject: Re: [IBM-MAIN] question to backup on 3590
> >
> > I have a customer who backs up a data amount of about 500 GB with 2 Jobs
> > each day on a 2-drives-359
I thought Escon was about 17 Mb/sec and the B11 drives were 9 Mb/sec.
True, but the 17MB/sec on the channel is the maximum instantaneous rate;
the max effective rate after channel turnarounds and CU-channel control
exchanges is rarely more than 14MB/sec, usually less.
On the tape, the max s
I thought Escon was about 17 Mb/sec and the B11 drives were 9 Mb/sec.
We have 2 A50's w/ 2 ESCON each with B1A drives, one has 4 drives, the
other has 2, all in the same 3494. There isn't much difference in dump
ET to any of the 6 drives, there a slight advantage to the A50 with only
2 drives,
ot;Eric N. Bielefeld" <[EMAIL PROTECTED]>
Sent by: IBM Mainframe Discussion List
05/15/2006 12:43 PM
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Re: question to backup on 3590
I'm sure that two escon channels would greatly speed
I'm sure that two escon channels would greatly speed up your backups. I had
a similar experience at P&H Mining around 2000. We got 4 3490E drives, and
1 controller with 2 escon channel interfaces. That was 16 transports for 2
channels. I think the backups actually took longer than with 24 34
I have a customer who backs up a data amount of about 500 GB with 2 Jobs
each day on a 2-drives-3590 with DSS. Because of data growth, he has now
problems with his batch window. His 3590 (A50/B11) is connected to his R36
by one escon channel. During the backup the channel is completely busy. I
ha
Hi listers,
I have a customer who backs up a data amount of about 500 GB with 2 Jobs
each day on a 2-drives-3590 with DSS. Because of data growth, he has now
problems with his batch window. His 3590 (A50/B11) is connected to his R36
by one escon channel. During the backup the channel is completely
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