On 13 August 2012 09:31, Anne & Lynn Wheeler <[email protected]> wrote:
> In that time-frame, IBM had developed its own serial-copper for disk > operation (internal name harrier out of hursley) and announced as > 9333. It ran 80mbits/sec ... full-duplex (aka concurrent 80mbit/sec in > both direction) using "packetized" SCSI commands ... aka rather than > half-duplex SCSI bus signaling ... the SCSI commands were encapsulated > in message packets and transmitted asynchronously (using effectively > identical SCSI disks ... harrier had significant higher aggregate > thruput than equivalent scsi disks in a half-duplex scsi-bus > configuration). > > We tried to get harrier enhanced to interoperate with FCS ... multiple > fraction of FCS media ... still using serial copper ... but running into > FCS non-blocking switch and speed-matching handled. Instead, it morphed > into "SSA" (running at 160mbits/sec in each direction) ... and > non-interoperable with FCS. > > old post mentioning SSA & FCS > http://www.garlic.com/~lynn/95.html#13 SSA was an industry standard for a few milliseconds in 1997. It's sad/amusing to scan the Wayback Machine for the quondam SSA Industry Association site www.ssaia.org . From 1997 to early 1998, it's there, along with an impressive list of industry members, from Adaptec through DEC (heh), Dell, IBM, and Zitel, with more in between. Then it's stagnant through 2000, "domain available" in 2001, and then "Cindy" and various others would like you to explore their charms after that. One would think that Fortune 500 companies would protect their old sites, but no one seems to have noticed or cared about this one. SSA drives and controllers still show up on eBay, though the frequency has dropped. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
