Was/Is it a mainframe technology in the old days? I meant
when you trace the history....
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> Was/Is it a mainframe technology in the old days? I meant
> when you trace the history....
RAID = Redundant Array of INEXPENSIVE Disks.
So that is a ''no'' on the mainframe angle.
It seems. howebver, that IBM had a patent on
some RAID-like RAM redundancy technique in 1978,
that was similar to RAID5. So the mainframe angle is
back in ;-)
>Was/Is it a mainframe technology in the old days? I meant
>when you trace the history....
You can read the original 1988 paper; it's linked from the Wikipedia
entry. It compared RAID arrays to IBM3380 [14 in. dia, 24 cu. ft. 6600
watts], Fuji Eagles, and similar 'pizza ovens..'
Note the marketdroids later changed the name from "inexpensive" to
"independent" to sound better...
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A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
> It seems. howebver, that IBM had a patent on
> some RAID-like RAM redundancy technique in 1978,
> that was similar to RAID5. So the mainframe angle is
> back in ;-)
Most IBM mainframes are still serving mission-critical
stuff... Wonder when the PCs could replace them ...
esp. the banks.
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>> Was/Is it a mainframe technology in the old days?
>Nope. Mainframes never ever had anything even remotely resembling anything like inexpensive disks.
Hence the interest in RAID. In that era, Big Iron used things like
Eagles; or more likely only Big Blue products. ["No one ever got fired
for buying IBM.." was not a fable, but a truth....]
DEC's had, for example, RA81's, a 400 MB, 14 inch platter monster. I
recall the DEC Field Circus guy might as well as had a cot next to the
VAX, he was working on 'em so often.
When those toy computers started showing up with Winchester drives [aka
5.25" case] at a fraction of the price... it got attention.
It was far later when PeeCees had any need for the storage
volume/redundancy of RAID.
--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
"David Lesher" <wb8foz@panix.com> wrote in message news:g26btd$r1$1@reader2.panix.com...
>
> Hence the interest in RAID. In that era, Big Iron used things like
> Eagles; or more likely only Big Blue products. ["No one ever got fired
> for buying IBM.." was not a fable, but a truth....]
>
> DEC's had, for example, RA81's, a 400 MB, 14 inch platter monster. I
> recall the DEC Field Circus guy might as well as had a cot next to the
> VAX, he was working on 'em so often.
>
> When those toy computers started showing up with Winchester drives [aka
> 5.25" case] at a fraction of the price... it got attention.
>
First gen PC drives were junk with stepping motors.
Minicomputers were using 8" sealed drives with linear actuators.
> It was far later when PeeCees had any need for the storage
> volume/redundancy of RAID.
>
PC servers started to compete with minis around 1990, they had local-bus SCSI.
Eric Gisin <gisin@uniserve.com> wrote
> David Lesher <wb8foz@panix.com> wrote
>> Hence the interest in RAID. In that era, Big Iron used things like
>> Eagles; or more likely only Big Blue products. ["No one ever got
>> fired for buying IBM.." was not a fable, but a truth....]
>> DEC's had, for example, RA81's, a 400 MB, 14 inch platter monster. I recall the DEC Field Circus guy might as well as
>> had a cot next to
>> the VAX, he was working on 'em so often.
Didnt have that problem with any of ours. Or the 11s that preceeded those.
>> When those toy computers started showing up with Winchester drives [aka 5.25" case] at a fraction of the price... it
>> got attention.
> First gen PC drives were junk with stepping motors.
> Minicomputers were using 8" sealed drives with linear actuators.
And removable pack drives as well.
>> It was far later when PeeCees had any need for the storage volume/redundancy of RAID.
> PC servers started to compete with minis around 1990, they had local-bus SCSI.
Rod Speed wrote in news:6aojsiF39bi7uU1@mid.individual.net
> Eric Gisin <gisin@uniserve.com> wrote
> > David Lesher <wb8foz@panix.com> wrote
>
> > > Hence the interest in RAID. In that era, Big Iron used things like
> > > Eagles; or more likely only Big Blue products. ["No one ever got
> > > fired for buying IBM.." was not a fable, but a truth....]
>
> > > DEC's had, for example, RA81's, a 400 MB, 14 inch platter monster.
> > > I recall the DEC Field Circus guy might as well as had a cot next to
> > > the VAX, he was working on 'em so often.
>
> Didnt have that problem with any of ours. Or the 11s that preceeded those.
I think he meant the RA8x.
>
> > > When those toy computers started showing up with Winchester drives
> > > [aka 5.25" case] at a fraction of the price... it got attention.
>
> > First gen PC drives were junk with stepping motors.
> > Minicomputers were using 8" sealed drives with linear actuators.
Don't know about that.
We did use 8" Fujitsus though, on Emulex RA8x emulating controllers.
IINM you could fit 4 of them in one chassis.
Before that I think we had CMDs but they didn't last very well.
And since minicomputers were PDP8I PDP8E/S PDP8A, PDP11-40/45
PDP11-04/34 PDP11-44 PDP11-24/84 PDP11-03/23/83, VAX-11 uVAX
VAX etc etc there was all kinds of stuff hanging off of them.
We even had Vermont drums hanging off PDP8 which were later
replaced by AMPEX MegaStores (Solid State) or RL01/02.
>
> And removable pack drives as well.
RL01/02, they indeed had linear actuators.
>
> > > It was far later when PeeCees had any need for the storage volume/redundancy of RAID.
>
> > PC servers started to compete with minis around 1990, they had local-bus SCSI.
The origin of RAID 
Linear Mode
