Comment 10 for bug 1592990

You made me smile.

Once upon a time - many years ago - I think I used to know what I was talking about. Then I moved into sales and 30 years of engineering was tucked away. Sometimes it likes to reach out for the sun again.

Thanks for the overview - it's nice to learn about the underlying details again.

Ron Argent
Director
TES Enterprise Solutions

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-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of ChristianEhrhardt
Sent: 16 June 2016 17:35
To: Ron Argent
Subject: [Bug 1592990] Re: HCPGIR450W CP entered; disabled wait PSW 00020000 80000000 00000000 00004502

For the protocol question - it is not FCP encapsulated in FICON - here a bit simplified:
I hope that keeps format :-)

+--------+ +--------------------+
| V7000 | | z/VM |
| | | | +-------+
| | | | | Linux |
| | SCSI | EDEV | ECKD | Guest |
| +-----------+ Emulation +---------+ |
+--------+ FCP | | VRITUAL | |
                     | | +-------+
+--------+ | |
| DS8K | | | +-------+
| | ECKD | | ECKD | Linux |
| +-----------+ +---------+ Guest |
| | FICON | | VIRTUAL | |
| | | | | |
+--------+ +--------------------+ +-------+

FCP and FICON are alternative protocols you can drive via fiber.
ECKD and SCSI are the languages that that a driver can talk to a device (one level above the FCP/FICON thing).

So with EDEVs in z/VM for Ubuntu as a Linux guest it is actually the "same" as if you have a dasd disk on a DS8K.

Although the EDEV one it might have a few special attributes / characteristics.

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https://bugs.launchpad.net/bugs/1592990

Title:
  HCPGIR450W CP entered; disabled wait PSW 00020000 80000000 00000000
  00004502

Status in Ubuntu on IBM z Systems:
  Triaged

Bug description:
  zVM v6.3 zBC12 V7000 FICON SAN048B

  Installed Ubuntu on zBC12 with FICON attached (via SAN048B switches)
  using instructions at
  https://wiki.ubuntu.com/S390X/Installation%20In%20zVM.

  Installation build completed OK but IPL fails (after initial boot options appear and timeout to default) with following error message:
  HCPGIR450W CP entered; disabled wait PSW 00020000 80000000 00000000 00004502

  A trace was taken using:

  #CP TR SSCH RUN
  #CP IPL <ipldev>
  #cp tr end

  The resulting trace appears to fail at the same point in the trace on every IPL.
  Several builds have been attempted on different VMs with identical symptoms.

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