ADSM-L

Re: [ADSM-L] Equating current 3494 configuration to TS3500 - drive sharing

2013-04-24 21:07:53
Subject: Re: [ADSM-L] Equating current 3494 configuration to TS3500 - drive sharing
From: Steven Harris <steve AT STEVENHARRIS DOT INFO>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Thu, 25 Apr 2013 11:05:59 +1000
Hi Zoltan

You can share drives between your logical libraries in the TS3500 when
you have ALMS. Doing this might give you more flexibility in your drive
assignments.

I am doing a similar 3494 to TS3500 migration at the moment.  The person
who sized the TS3500 did it by TB and not by slots so I can't fit all my
old TS1120 JA-E05 format tapes into the new library, which has TS1140s
and is writing JC-E07 format, but they want to get the old library off
the floor asap.  Fortunately there is enough floor space that the two
can co-exist for a while.

In the new library I have two logical libraries A and B.  There are 12
TS1140 drives. A has 6 dedicated drives and 5 shared. B has 1 dedicated
drive and 5 shared.  Control paths cannot be shared.

At the moment all new data is being written to the A library and it has
11 drives in use.  The B library is not in use, but is defined. There is
a library manager in this mix but I won't detail that as it adds nothing
to the argument here.

The 5 shared drives have paths defined in library A and library B, the
device names used in these paths are the same but obviously the complete
paths are different

eg - this is on AIX

def path server1 f1d7 srct=server destt=drive library=libA
device=/dev/rmt74 online=yes
def path server1 f1d7 srct=server destt=drive library=libB
device=/dev/rmt74 online=no.

When they make me retire the 3494 I will move its remaining tapes into
libraryb, and vary on enough of the shared paths on server1/library b as
necessary to support the workload, while varying them off to
server1/library a.  As the workload drops off I will vary on/off so that
more drives are available to lib a and fewer to lib b.

Caveats

1. So far this is set up and lib A access works, but I have not tried lib B
2. It is possible that this could work with drives varied on to both
libraries simultaneously, and the sharing controlled by SCSI
reserve/release, but I already have this shared with a library manager,
I don't like SCSI reserves and I'm not willing to try hardware level
sharing.


Hope this helps

Steve

Steven Harris
TSM Admin
Canberra Australia





On 25/04/2013 4:39 AM, Zoltan Forray wrote:
Thanks for all the responses - it has been immensely educational and I have
much less trepidation about the upcoming
unload-pull-out-3494-push-in-reload-3584 weekend. I am going to miss my
3494 - been using it since 1995!

I agree that Wanda has some of the best documentation/experiences with TSM,
et-al - she should be writing for IBM/Redbooks!


On Wed, Apr 24, 2013 at 8:35 AM, Arbogast, Warren K <warbogas AT indiana DOT 
edu>wrote:

Zoltan,
The Web Specialist can be used with an https interface, and a physical
console to the 3584 is available. I have little experience with the
physical console, but you could determine whether it has the features and
suits your needs better than the Web Specialist.

Wanda just wrote the Red Book on setting up a 3584. It's more complete,
easier to comprehend and better organized than anything you will find in
the official documentation.

With best wishes to all,
Keith Arbogast
Indiana University



--
*Zoltan Forray*
TSM Software & Hardware Administrator
Virginia Commonwealth University
UCC/Office of Technology Services
zforray AT vcu DOT edu - 804-828-4807
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