migration processes run as the greatest of
A) migpr : migration processes setting for the storage pool
B) number of tape drives available
C) number of unique node's data in the "from" pool (only 1 nodes data, only
1 migration process)

Reclamation will first grab for a "filling" tape, if one is not available
(selection based on collocation settings) then a scratch is used.

Yes, there are internal priorities and now and again one might see where a
process is being pre-empted for a higher priority process.

Ok, and I'm going off of adsm info really... only have two tsm servers in
testing currently and I can't really swear on my dad's grave on this but I
would assume it is the same or better... everything is running fine but I
don't have loads to really test (and probably won't specifically test) such
things until I run into some limitation with my 4 drives per adsm server
again.

Dwight

> ----------
> From:         Gerald Wichmann[SMTP:gwichmann AT SANSIA DOT COM]
> Reply To:     ADSM: Dist Stor Manager
> Sent:         Wednesday, April 05, 2000 2:24 PM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      tape libraries
>
> How does TSM use a tape library with multiple tape drives? For example, if
> I
> have a tape library with 2 tape drives and a migration kicks off, will it
> mount a tape in each tape drive for better throughput and migrate to two
> tapes at once?
>
> During reclamation does it mount a scratch in one drive and the tape being
> reclaimed in the other and go straight from tape to tape?
>
> What happens if someone kicks off a restore that requires a tape and both
> tapes are being used (if they're both being used) as in the above
> instances?
> I'm assuming the higher priority process (restore) halts the
> migration/reclamation like it does on a single drive library and grabs a
> drive...?
>
> I guess overall I'm just wondering how TSM takes advantage of the 2nd
> drive
> in the library.. I'm familiar with libraries with 1 drive up until this
> point but will soon work with one with 2..
>
> Gerald Wichmann
> RS Engineer
> Sansia System Solutions
> 408-844-8893 work
> 408-844-9801 fax
>