camcontrol cdb to disconnect drive

Kevin A. Pieckiel pieckiel+freebsd-questions at
Fri Feb 4 07:23:37 PST 2005

Hey, all.

I want to replace a 9 GB SCSI drive with an 18 GB SCSI drive.  All the
hardware supports hot-swapping.  Just for kicks, I thought I'd try to
turn the drive off via SCSI commands and replace it without rebooting.

The camcontrol utility doesn't have a disconnect command or a stop unit
command (that I can find), so I was going to try to use 'camcontrol cdb'
to send a stop unit command to the drive.  Has anyone done anything
similar?  Can someone help me locate the necessary parameters to use
for this command?  All I can seem to find with Google is a quick
reference for SCSI commands.  It tells me the command to use is 1B, but
I don't know what other details are needed to fill out the CDB command.
I need to fill 6, 10, 12, or 16 bytes, and I only have the first.  Help?

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