AIX 'Control Path Fallover' is a feature to allow the library robot
control path to automatically fail over to a different drive.  The Atape
driver provides for load balancing and fail over between different routes
to the drive.

Orville L. Lantto
Datatrend Technologies, Inc.  (http://www.datatrend.com)
IBM Premier Business Partner
121 Cheshire Lane, Suite 700
Minnetonka, MN 55305
Email: Orville.Lantto AT datatrend DOT com


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Tom Kauffman <KauffmanT AT NIBCO DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
04/20/2004 10:33 AM
Please respond to "ADSM: Dist Stor Manager"

        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Question on LTO-2 dual-path fiber attach drives
(AIX platform)


It is time to upgrade our tape drives - the current lease is coming up for
renewal. I will be replacing LTO-1 SCSI drives with LTO-2 fiber drives. Do
I
need to get the AIX 'Control Path Fallover' option for TSM to properly
recognize that there are two paths to a drive and only use one? My current
understanding is that Control Path Fallover will allow TSM to continue a
process running against a particular tape and tape drive on the second
path
if the first fails, as opposed to cancelling the process (and possibly
flagging the tape as unavailable).

Realisticly, how often does a path fail in the real world? We currently
have
two 2019-F16 switches and will be adding two more with the tape drives. We
also have just the one TSM server and are not currently planning on
running
anything LAN-free.

TIA

Tom Kauffman
NIBCO, Inc