probe-scsi, probe-scsi-all hangs after issuing a Stop-A, on Ultra [TM] machines, or fails with a "bus fault"

Asset ID:	1-72-1010034.1
Update Date:	2017-11-30
Keywords:

Solution Type Problem Resolution Sure

Solution 1010034.1 : probe-scsi, probe-scsi-all hangs after issuing a Stop-A, on Ultra [TM] machines, or fails with a "bus fault"

Applies to:

Sun Ultra 25 Workstation - Version Not Applicable and later
Sun Ultra 45 Workstation - Version Not Applicable and later
Sun Ultra 60 Workstation - Version Not Applicable and later
Sun Ultra 80 Workstation - Version Not Applicable and later
Sun Ultra 450 Workstation - Version Not Applicable and later
All Platforms

Symptoms

Issuing a probe-scsi or a probe-scsi-all after halting or issuing a stop-A may cause the system bus to hang or fail with a "bus fault" on Ultra [TM] machines (Sun4u).

Cause

If you look at the OpenBoot[TM] 3.x Command Reference manual, after halting or issuing a stop-A, if you run a probe-scsi or probe-scsi-all it may produce unpredictable results, if a system reset wasn't performed prior to executing the command.

Solution

The OBP (OpenBootPROM) can not control what state the system ends up in when it is halted; therefore, the OBP needs to be reinitialized prior to executing any test commands, like the probe-scsi-all command.

Here are the steps you should take prior to running a probe-scsi or a probe-scsi-all:
If Solaris[TM] is running, perform a gracefully shut down to run level 0 (boot prompt "ok" prompt)
ok setenv auto-boot? false
ok reset-all
ok probe-scsi   \ check your output
ok setenv auto-boot? true
ok reset-all
Notes:
1. The auto-boot variable controls whether or not the system automatically boots after a system reset or when the power is turned on. When set to false, the system will not attempt to boot. When set to true, the system will attempt to boot.
2. When halting a system you attempt to shut down Solaris "cleanly" to ensure that all file systems are unmounted and processes are stopped before the Solaris kernel is rebooted. Issuing a stop-A sequence should only be performed as a last resort.

Product
High-End Servers
Entry Level Servers
Desktops & Workstations

probe-scsi-all, probe-scsi, stop A, halt, obp, hang, reset-all, break
Previously Published As
13189

Change History
This article needs to have the Product statement defined better. We need to know which High-End Servers, Entry Level Servers and Desktops & Workstations this article applies to.

MIGRATION CLEANUP
Product_uuid
32cacf0e-224e-11d6-92bd-f1f644a3514f|High-End Servers
32c05da8-224e-11d6-8994-851fde33c817|Entry Level Servers
32b89a64-224e-11d6-9413-d816c3e397f3|Desktops & Workstations

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