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INTELLIGENT PERIPHERAL INTERFACE (IPI) page

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Louis Ohland

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May 9, 2022, 12:16:00 PM5/9/22
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http://ps-2.kev009.com/ohland/SCSI/Intelligent_Peripheral_Interface.html

Supposedly IPI was a thing for high end servers. SOOOO impressive that
there is limited mention of it?

RickE

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May 9, 2022, 3:23:12 PM5/9/22
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> Supposedly IPI was a thing for high end servers. SOOOO impressive that
> there is limited mention of it?

Some things never really take off. ATA was "good enough" for even low-end servers, most servers used SCSI until it ran out of gas, today low-end servers use SATA, mid-end servers usually use NVMe or SAS, high-end servers use some flavor of fiber (FICON and FCP are popular but there's got to be at least a dozen other proprietary schemes). And within a SAN you have "speed layers" of storage, with the fastest flash as the top tier, then another one or two tiers of slower flash, then various tiers of spinning rust, and finally tape (yes, LTO is still a thing). For the home and small businesses, a lot of people use a NAS, and those come in a wide variety of flavors. And then there's cloud storage...

Grant Taylor

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May 9, 2022, 5:44:31 PM5/9/22
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On 5/9/22 1:23 PM, RickE wrote:
> Some things never really take off. ATA was "good enough" for even
> low-end servers, most servers used SCSI until it ran out of gas, today
> low-end servers use SATA, mid-end servers usually use NVMe or SAS,
> high-end servers use some flavor of fiber (FICON and FCP are popular
> but there's got to be at least a dozen other proprietary schemes).

SCSI hasn't run out of gas. Not if you count SAS or FCP as they are
both based on SCSI.

SAS is as much SCSI as SATA is ATA.

> And within a SAN you have "speed layers" of storage, with the fastest
> flash as the top tier, then another one or two tiers of slower flash,
> then various tiers of spinning rust, and finally tape (yes, LTO is
> still a thing).

That tiered storage model applies to many different communications
technologies.

> For the home and small businesses, a lot of people use a NAS, and those
> come in a wide variety of flavors. And then there's cloud storage...

What is NAS if not a protocol for accessing storage over the
(inter)net(work)? Sort of like accessing your storage in someone's
cloud....

I feel like you're comparing a Toyota Camry to an sedan to an automobile
to a transportation method.



--
Grant. . . .
unix || die

Kevin Bowling

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May 14, 2022, 2:05:36 PM5/14/22
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I believe it was used by the IBM 9332, 9335, 9336 externally. Rackmount
disks for 9370, small es/9000 (9335/9336), and early large as/400s. Sun
also optioned it in some early sparcservers.
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