⟩ What is the difference between a probe-scsi and a probe-scsi-all?
Both these commands are run at obp (open boot Prom) probe-scsi will probe the internal scsi and probe-scsi-all will probe both internal and external scsi.
Maybe not the best explanation but not bad...
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The probe-scsi command communicates with all SCSI devices connected to on-board SCSI controllers.
The probe-scsi-all command additionally accesses devices connected to any host adapters installed in PCI slots.
