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

[Mark Pizzolato - Info Comm]

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.

- Mark
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