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  • INTELLIGENT PERIPHERAL INTERFACE (IPI) page

    From Louis Ohland@21:1/5 to All on Mon May 9 11:15:57 2022
    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?

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  • From RickE@21:1/5 to All on Mon May 9 12:23:12 2022
    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...

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  • From Grant Taylor@21:1/5 to RickE on Mon May 9 15:44:34 2022
    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

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  • From Kevin Bowling@21:1/5 to Louis Ohland on Sat May 14 11:05:34 2022
    On 5/9/22 09:15, Louis Ohland wrote:
    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?

    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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