Date: Sat, 26 Mar 2011 03:09:41 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Kostik Belousov <kostikbel@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: tying down adaX to physical interfaces Message-ID: <20110326100941.GA50429@icarus.home.lan> In-Reply-To: <20110326095444.GV78089@deviant.kiev.zoral.com.ua> References: <AFDA19F9-DC78-463D-862D-6E4F3CB2C2C3@deman.com> <20110326003818.GT78089@deviant.kiev.zoral.com.ua> <D665B3EE-34D6-4125-A9C1-06C71548F7F5@deman.com> <20110326051643.GA43364@icarus.home.lan> <20110326095444.GV78089@deviant.kiev.zoral.com.ua>
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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@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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