On Thu, 24 Jan 2013, Jeremy Chadwick wrote:
#1. Map the physical drive slots to how they show up in FBSD so if a
disk is removed and the machine is rebooted all the disks after that
removed one do not have an 'off by one error'. i.e. if you have
ada0-ada14 and remove ada8 then reboot - normally FBSD skips that
missing ada8 drive and the next drive (that used to be ada9) is now
called ada8 and so on...
How do you do that? If I'm in that situation, I think I could find the
bad drive, or at least the good ones, with diskinfo and the drive serial
number. One suggestion I saw somewhere was to use disk serial numbers
for label values.
The term FreeBSD uses for this is called "wiring down" or "wired down",
and is documented in CAM(4). It's come up repeatedly over the years but
for whatever reason people overlook it or can't find it.
I was aware of it, it just seems like there ought to be a better way to
identify drives than by messing with the hardware configuration.
Something more elegant, less tied to changing the hardware configuration
of the host. Assigning the drive serial number as a label, for example.
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