ADSM-L

Re: Colocating in a limited library

1997-05-08 09:02:57
Subject: Re: Colocating in a limited library
From: "Prather, Wanda" <PrathW1 AT CENTRAL.SSD.JHUAPL DOT EDU>
Date: Thu, 8 May 1997 09:02:57 -0400
Thanks very much for the information..

>----------
>From:  Sal Salak Juraj
>Sent:  Wednesday, May 07, 1997 1:29 PM
>To:    ADSM-L AT VM.MARIST DOT EDU
>Subject:       Re: Colocating in a limited library
>
>Wanda,
>
>I handle similar problem exactly how you want to handle it, and it works
>pretty fine.
>In the initial state I was even able to control a bit which client wil
>go to which tape.
>
>First I defined STG with one tape only (no scratch) and backed up three
>very small nodes - all of them went to this tape.
>Then I added second tape volume to this pool, and backed up fourth,
>large node, It went to the second tape.
>The I added another tape volume, etc. etc.
>
>It works fine till now, and ADSM keeps this initial node/tape
>connection..
>Yes, this is of limited usability only , because at least then when one
>client (or client group)
>will overrun its/their tape, the association wil change. But with tapes
>large enough
>the initial order can last long enough untill larger tapes come on the
>market.
>
>bye, Juraj Salak, Austria
>
>> Date:    Tue, 6 May 1997 10:45:25 -0400
>> From:    "Prather, Wanda" <PrathW1 AT CENTRAL.SSD.JHUAPL DOT EDU>
>> Subject: Colocating in a limited library
>>
>> We have an automated tape library.
>> I just check in tape cartridges in "scratch" status, and let ADSM pull
>> tapes as needed from the scratch pool into the backup and archive tape
>> pools.
>> My backup tape pool is colocated.
>> This works fine because I have more cartridges than clients.
>>
>> But, we are about to add hundreds of clients, so that I will have more
>> clients than cartridges.
>> Each cartridge holds 35 GB, so I should be able to get several clients
>> per cartridge with no problem, but I would still like to colocate for
>> speed on restore..
>>
>> How do other people handle this situation?
>> I think that probably all I have to do is stop using "scratch" tapes and
>> manually define a fixed number of cartidge volumes to each pool.  Are
>> there other considerations?
>
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