"Least Recently Used" I think is the management level explanation of how
it is done.

Andy Huebner

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Richard Sims
Sent: Wednesday, August 22, 2007 10:57 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] How does a library choose a drive?

On Aug 22, 2007, at 11:32 AM, Mcnutt, Larry E. wrote:

> TSM Server 5.3.3.0
> AIX 5.3
>
> This is probably not a TSM specific question, but hopefully someone
> can
> point me to the right place to look.
> We would like to understand how the library decides which available
> drive to use. ...

It doesn't decide: the host determines which drive to use.
TSM uses them rotationally, to balance wear.

For a 3494 library, see the MTIOCLM (Library Mount) library system
call in the IBM SCSI Device Drivers Programming Reference for the
nitty-gritty.  For a SCSI library, where the host has to engage in
more intricate control of library mechanics, I believe it's the
SMCIOC_MOVE_MEDIUM call (Transport a cartridge from one element to
another element).

    Richard Sims


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