[Sunhelp] Dual-channel differential UltraSCSI card?

[McMurry, James A.]

Just checking my thinking here:

I'm about to get an AIT tape library and Legato Networker running something
like an Ultra 60 or E250 and Solaris 7.  The tape library will have two
drives (F/W, differential SCSI) to start, and can expand to four total.

I want to get two controllers for the two drives.  If I add a third and
fourth drive later, I'll have two drives on each controller.  It's best to
limit tape drives to two per controller since they drag down the SCSI bus.
You certainly don't want to put tape drives and hard disks on the same
controller.  So goes the conventional thinking.

Sun sells a "dual-channel differential UltraSCSI" PCI card.  I believe that
this single card would give me what I want:  two discreet SCSI channels for
each pair of drives.  It's not like I'll overload the card with the amount
of data I'm transferring...

Is this correct?  Or should I be looking at a pair of single-channel cards?

Thanks,

James McMurry
GNMC Systems Support Manager
Destia Communications, Inc.
james.mcmurry at destia.com
http:/www.destia.com/