[Simh] EXT :Re: PDP-10 simulation: DEUNA support help needed

[Johnny Billquist]

On 2015-05-01 00:21, Mark Pizzolato - Info Comm wrote:
>
> On Apr 30, 2015 1:46 PM, Clem Cole <clemc at ccc.com> wrote:
>  >
>  >
>  > On Thu, Apr 30, 2015 at 4:20 PM, Rich Alderson
> <simh at alderson.users.panix.com> wrote:
>  >>
>  >> Striping came along with redundant arrays of
>  >> inexpensive disks.  At $50,000 a drive, RP07s were not candidates. ;-)
>  >
>  >
>  > ​Rich,
>  >
>  > Be careful here with that sort of statement.   Striping as a
> technology predates RAID and certainly could have been used by large
> commercial systems if people had wanted too.   Supercomputers like Crays
> and CDC, as well as the "mini-crays" like Convex and even the "Crayolla"
> (Stellar) all striped with very expensive 19" technology in the late
> 1970s and 1980s.
>  >
>  > You are correct, that striping as a popular technique does not go
> mainstream until the 3.5" technology where the cost per byte got low
> enough that "anyone" could afford it - i.e. when the idea of RAID shows up.
>
> Actually, even before low cost 3.5" drives were available, RAID was an
> industry acronym, but in those days it came from Redundant Array of
> Independent Disks.
>
> VMS Volume Shadowing and then the Stripe Driver implemented RAID 1 and
> RAID 0 respectively.

(I have that under RSX as well... :-) )

	Johnny