[email protected] (Anne & Lynn Wheeler) writes: > Part of the issue with serial fibre-optic for fibre channel standard > http://en.wikipedia.org/wiki/Fibre_Channel > and similar work going on about the same time with scalable coherent > interface (that I also got dragged into) > http://en.wikipedia.org/wiki/Scalable_Coherent_Interface > > was to trying to eliminate the increasing end-to-end latency penalty in > protocols. The objective was to move to protocols that just treated the > media as raw continuous transport.
re: http://www.garlic.com/~lynn/2013m.html#94 SHARE Blog: News Flash: The Mainframe (Still) Isn't Dead pure aside, in the late 80s, the IBM Hursley lab did something similar to FCS & SCI (and what I worked with for channel extender in 1980) with Harrier/9333 ... at the time it was 80mbit/sec serial "copper" links (concurrent in both directions, not fiber-optic) ... they packetized scsi i/o program and downloaded to remote end ... where it was executed ... significantly reducing the latency and significantly increasing aggregate throughput (compared to standard scsi bus ... where actual physical disk drives in the benchmark comparisons were essentially otherwise identical). as part of ha/cmp, I was hoping to see harrier/9333 evolve into inter-operable fractional FCS ... old post with some discussion http://www.garlic.com/~lynn/95.html#13 http://www.garlic.com/~lynn/96.html#15 however, end of Jan1992, cluster scaleup is transferred and we are told we can't work on anything with more than four processors ... and we decide to leave. Then Harrier/9333 evolves into (non-interoperable) SSA with serial copper upgraded/doubled to 160mbits/sec (concurrent in both directions) or approx. 40mbyte/sec aggregate http://en.wikipedia.org/wiki/Serial_Storage_Architecture by comparison ESCON is 200mbits/sec links or 400mbits/sec (50mbyte/sec) aggregate ... but is lucky to achieve 17mbyte/sec aggregate throughput small mention of 9333 here http://en.wikipedia.org/wiki/History_of_IBM_magnetic_disk_drives some old email http://www.garlic.com/~lynn/2006p.html#email881011 http://www.garlic.com/~lynn/2009q.html#email901024 http://www.garlic.com/~lynn/2010.html#email920629 http://www.garlic.com/~lynn/2001f.html#email920630 http://www.garlic.com/~lynn/2010.html#email960203 -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
