The current user manual in section 5.1 says "Currently virtio-scsi controller support is experimental." (However this is in the text and not in a warning call-out box, so somewhat easy to miss.)
However, Section 14.1, Experimental Features, does not list virtio-scsi as experimental.
this inconsistency appears to be a documentation bug So, What's the status of virtio-scsi and which section should be updated?
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In case anyone asks, the error that I saw on the guest VM:
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Feb 23 03:59:08 msw kernel: virtio_scsi virtio1: request:id 825 is not a head!
Feb 23 03:59:39 msw kernel: sd 0:0:0:0: [sda] tag#716 FAILED Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK cmd_age=0s
However, there was nothing in the guest's VBox.log or the host's syslog, so I don't know quite how to debug/collect enough info for a bug report. Though googling the log messages brought me to other mentions of problems with virtio-scsi.