ADSM-L

Re: 3494 Library and dual gripper?

2003-10-27 09:47:44
Subject: Re: 3494 Library and dual gripper?
From: Jim Sporer <james.sporer AT DOIT.WISC DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 27 Oct 2003 08:45:57 -0600
Al,
We have the HA feature on our 3494 without dual grippers.
Jim Sporer

At 02:24 PM 10/24/2003 -0500, you wrote:
Our dual gripper is used 6% of the time, but we also have an HA setup (2
accessors) which requires dual grippers.  You do lose storage slots at the
top and bottom as noted, but the thing I don't understand is why the top 2
slots of the I/O door aren't blocked out like the shelves because the
bottom gripper can't reach these either.

Just one of those odd observations.

-Al





Richard Foster <Richard.Foster AT HYDRO DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
10/24/03 06:58 AM
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Re: 3494 Library and dual gripper?



> A dual gripper shaves some seconds off the overall time.

It may be worth pointing out that a dual gripper loses you some library
tape slots - 10% of them, in fact. The upper gripper cannot reach the
lowest 2 slot levels, nor can the lower gripper reach the highest 2
levels.
Therefore these 4 levels are lost (and are physically blanked off in our
library).

It's an open question why IBM chose to do it that way, because it was
surely possible to program the control PC to use the appropriate gripper
for these levels. Probably that nice warm feeling of redundancy.

Richard Foster




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