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Conference 7.286::fddi

Title:FDDI - The Next Generation
Moderator:NETCAD::STEFANI
Created:Thu Apr 27 1989
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2259
Total number of notes:8590

863.0. "DAS vs. Multiple SAS " by STOHUB::KARKAR::RICHARDSON () Mon Feb 15 1993 15:12

I have a customer who is consolidating many old Digital systems into a cluster of 2 7000's.  This
system will need to be highly reliable and will have high I/O demands placed on it.  The customer 
is planning to put 1 FDDI controller on the system.  

They want a failover capability to another FDDI connection that is dual-homed to 
another concentrator.  Their question is whether it would be better to have 2 SAS devices 
or 1 DAS device.  Do we have plans for a DAS XMI device?

What are the pro's and cons of 2 SAS devices as opposed to 1 DAS device?  If they are
running TCP on one device and DECnet on the other, can the 7000 failover to the other
device upon failure?

Thanks for the help,

Karla
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