As always this list has wealth of knowledge.  If we build it I may have real 
questions.

Thanks everyone.

Andy Huebner


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Rick Saylor
Sent: Wednesday, February 26, 2014 12:15 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Redundant Tape SAN

Andy,

Dual-ported drives such as the 3592 can be connected to both fabrics.
Single ported drives such as lto4 can be connected only to one fabric but you 
can alternate which fabrics the drives are connected to. So, half of the single 
ported drives are on one fabric and half are on the other. The AIX Atape driver 
will handle the multiple paths by enabling the alternate path option. To enable 
the alternate path support issue chdev  -l rmtx/smcx -a alt_pathing=yes for 
each rmt and smc device. By the way, there is a limit of 16 paths per device.
Below is a listing of the tape devices on my TSM server. You'll notice the 
drives appear multiple times, once as a primary(PRI) device and several more 
times as alternate(ALT) devices. You only need to define the primary devices to 
TSM. Atape will determine which path the I/O actually takes. I hope this helps.

lsdev -Cc tape
rmt0  Available 01-00-02-PRI IBM 3592 Tape Drive (FCP)
rmt1  Available 01-00-02-PRI IBM 3592 Tape Drive (FCP)
rmt2  Available 01-00-02-PRI IBM 3592 Tape Drive (FCP)
rmt3  Available 01-00-02-PRI IBM 3592 Tape Drive (FCP)
rmt4  Available 01-00-02-PRI IBM 3592 Tape Drive (FCP)
rmt5  Available 01-00-02-PRI IBM 3592 Tape Drive (FCP)
rmt6  Available 01-00-02-PRI IBM 3592 Tape Drive (FCP)
rmt7  Available 01-00-02-PRI IBM 3580 Ultrium Tape Drive (FCP)
rmt8  Available 01-00-02-PRI IBM 3580 Ultrium Tape Drive (FCP)
rmt9  Available 01-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt10 Available 01-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt11 Available 01-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt12 Available 01-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt13 Available 01-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt14 Available 01-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt15 Available 01-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt16 Available 01-01-02-PRI IBM 3580 Ultrium Tape Drive (FCP)
rmt17 Available 01-01-02-PRI IBM 3580 Ultrium Tape Drive (FCP)
rmt18 Available 0B-00-02-ALT IBM 3592 Tape Drive (FCP)
rmt19 Available 0B-00-02-ALT IBM 3592 Tape Drive (FCP)
rmt20 Available 0B-00-02-ALT IBM 3592 Tape Drive (FCP)
rmt21 Available 0B-00-02-ALT IBM 3592 Tape Drive (FCP)
rmt22 Available 0B-00-02-ALT IBM 3592 Tape Drive (FCP)
rmt23 Available 0B-00-02-ALT IBM 3592 Tape Drive (FCP)
rmt24 Available 0B-00-02-ALT IBM 3592 Tape Drive (FCP)
rmt25 Available 0B-00-02-ALT IBM 3580 Ultrium Tape Drive (FCP)
rmt26 Available 0B-00-02-ALT IBM 3580 Ultrium Tape Drive (FCP)
rmt27 Available 0B-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt28 Available 0B-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt29 Available 0B-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt30 Available 0B-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt31 Available 0B-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt32 Available 0B-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt33 Available 0B-01-02-ALT IBM 3592 Tape Drive (FCP)
rmt34 Available 0B-01-02-ALT IBM 3580 Ultrium Tape Drive (FCP)
rmt35 Available 0B-01-02-ALT IBM 3580 Ultrium Tape Drive (FCP)
smc0  Available 01-00-02-PRI IBM 3584 Library Medium Changer (FCP)
smc1  Available 01-00-02-ALT IBM 3584 Library Medium Changer (FCP)
smc2  Available 01-00-02-PRI IBM 3584 Library Medium Changer (FCP)
smc3  Available 01-01-02-ALT IBM 3584 Library Medium Changer (FCP)
smc4  Available 01-01-02-ALT IBM 3584 Library Medium Changer (FCP)
smc5  Available 01-01-02-ALT IBM 3584 Library Medium Changer (FCP)
smc6  Available 0B-00-02-ALT IBM 3584 Library Medium Changer (FCP)
smc7  Available 0B-00-02-ALT IBM 3584 Library Medium Changer (FCP)
smc8  Available 0B-00-02-ALT IBM 3584 Library Medium Changer (FCP)
smc9  Available 0B-01-02-ALT IBM 3584 Library Medium Changer (FCP)
smc10 Available 0B-01-02-ALT IBM 3584 Library Medium Changer (FCP)
smc11 Available 0B-01-02-ALT IBM 3584 Library Medium Changer (FCP)


At 10:27 AM 2/26/2014, you wrote:
>The concept, 2 fabrics, 1 server to 1 drive.
>In practice, many servers and many drives and many libraries.
>
>Andy Huebner
>
>
>-----Original Message-----
>From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf 
>Of Rick Saylor
>Sent: Wednesday, February 26, 2014 9:52 AM
>To: ADSM-L AT VM.MARIST DOT EDU
>Subject: Re: [ADSM-L] Redundant Tape SAN
>
>Andy,
>
>What do you mean by "redundant tape san"? Multiple tape libraries at 
>the same or remote location? Tape drives with more than one fiber port?
>
>Thanks,
>Rick
>
>At 08:19 AM 2/26/2014, you wrote:
> >Is anyone using redundant tape SAN with TSM on AIX?
> >
> >Andy Huebner