tying down adaX to physical interfaces
Jeremy Chadwick
freebsd at jdc.parodius.com
Sat Mar 26 10:09:44 UTC 2011
On Sat, Mar 26, 2011 at 11:54:44AM +0200, Kostik Belousov wrote:
> On Fri, Mar 25, 2011 at 10:16:43PM -0700, Jeremy Chadwick wrote:
> > Why would the disk number change on a drive swap? This doesn't happen
> > on my Intel ICH9R controller on *any* Supermicro X7xxx or Supermicro
> > PDxxx board I have access to.
> Because the order of enumeration of controllers depends on the
> BIOS, and is not consistent among boots. Also, it changes if you
> swap controllers or insert disks into the free bays in the backplane.
Re: insert disks into free bays: it behaves as I described in my post
(paragraph #7):
http://lists.freebsd.org/pipermail/freebsd-fs/2011-March/011039.html
If someone wants me to prove it, I'll be more than happy to start
removing/inserting disks on my system here at home to show exactly what
happens (using ICH9xx with ahci.ko). I would prove it as well with our
production machines but I'd have to physically be in the co-lo to swap
the disk. :-)
The OP only mentioned that he was concerned with device names changing
if he swapped disks. I have not seen hot-swapping (specifically
removal of old disk, insertion of new disk) result in the device number
increasing -- ever.
The OP didn't any mention of swapping or exchanging of controllers,
adding new ones, removing others, etc.. yeah, these could induce device
number changes, absolutely.
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP 4BD6C0CB |
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