Re: Missing disk unit

Hello Gary,

Am 10.12.2019 um 03:22 schrieb Gary Kuznitz <docfxit@xxxxxxxxxxxx>:

Does anyone have any suggestions as to what I can do to
recover a drive?

I have an AS/400 150 9401 that the UPS died today.
After booting it up I'm getting a (confusing to me)
message saying:

The following disk units are missing from the disk
configuration:

ASP 1 Unit 2 Type 6607 Resource Name DD002 Status
Configured.

When and where exactly do you receive this message? I guess you already switched to manual IPL mode and entered DST?

With a status configured and it says it's missing from the
configuration, I don't know what I an do to get it working
again.

This seems strange to me, also. I never observed that a disk is "jumping out" of an existing configuration, even after forced power-off (pull the plug) on several occasions. I wonder what really has happened. Did you take note of the last SRC on the display after IPL before you did… what?

Does anyone know what I can do?

In addition to Larry, I'd opt to clarify what the current status of the disk in question is. So, I'd recommend to run a disk surface test (if you're at it, on all built-in disks, just to be sure). Afterwards I'd try to deduct the configuration: "Flat" ASP with each disk just added for speed, or some kind of mirrored protection. I assume that the box has more than just two disks?

You may also tinker with "work with disk unit recovery" in DST and maybe re-add ("replace missing disk unit"). Since I never tried that myself, I don't know what happens. In any case I hop there are backups of the machine (at least one save 21 tape and maybe the last "increment" to that).

Good luck!

:wq! PoC

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