14 Aug
2023
14 Aug
'23
5:48 p.m.
On Aug 14, 2023, at 11:52 AM, Paul Koning via cctalk
<cctalk(a)classiccmp.org> wrote:
This is probably one of the earlier papers on RAID that came from Academia from the group
that invented it.
https://www2.eecs.berkeley.edu/Pubs/TechRpts/1987/5853.html
"Increasing performance of CPUs and memories will be squandered if not matched by a
similar performance increase in I/O. While the capacity of Single Large Expensive Disk
(SLED) has grown rapidly, the performance improvement of SLED has been modest. Redundant
Arrays of Inexpensive Disks (RAID), based on the magnetic disk technology developed for
personal computers, offers an attractive alternative to SLED, promising improvements of an
order of magnitude in performance, reliability, power consumption, and scalability.
This paper introduces five levels of RAIDs, giving their relative cost/performance, and
compares RAIDs to an IBM 3380 and a Fugitsu[sic] Super Eagle."
On Aug 14, 2023, at 12:42 PM, Chuck Guzis
<cclist(a)sydex.com> wrote:
On 8/14/23 06:07, Paul Koning wrote:
It's been a while, but I think that RAID originated in academia, though Cray may well
have been one of the earlier commercial users.
That drive was the fastest transferring disk, by a large margin, for quite a while.
Didn't Cray use multiple bits in parallel disk drives in the Cray-1?
I recall that the first time I heard the term "RAID", it was from one
of
my friends from Cray. I thought it was pretty innovative.
What I was referring to wasn't RAID but rather
single drives with parallel (multiple tracks concurrently) transfer, just like the
807/808. Does that ring any bells?
This sounds like it’s similar to, but not the same as fixed-head disk, or head-per-track
disks. DEC had several models of relatively low capacity in the 1970s positioned as
swapping devices with capacities from 128kB to 2048kB.
Or were you thinking of something more recent, like this:
https://techmonitor.ai/technology/designs_disk_arrays_with_ncr_parallel_dis…