svn commit: r220982 - in head: . sys/amd64/conf sys/arm/conf sys/conf sys/i386/conf sys/ia64/conf sys/mips/conf sys/mips/malta sys/pc98/conf sys/powerpc/conf sys/sparc64/conf sys/sun4v/conf

[David O'Brien]

On Sun, Apr 24, 2011 at 08:58:58AM +0000, Alexander Motin wrote:
> Log:
>   Switch the GENERIC kernels for all architectures to the new CAM-based ATA
>   stack. It means that all legacy ATA drivers are disabled and replaced by
>   respective CAM drivers. If you are using ATA device names in /etc/fstab or
>   other places, make sure to update them respectively (adX -> adaY,
>   acdX -> cdY, afdX -> daY, astX -> saY, where 'Y's are the sequential
>   numbers for each type in order of detection, unless configured otherwise
>   with tunables, see cam(4)).

I apologize if I missed a past discussion... but wasn't CAM designed
so that all disk-like things would be 'da' (direct access) irregardless
of underling protocol (SCSI/SAS/PATA/SATA)?  "afdX -> daY" above helps
suggest this.  Wasn't that the reason we moved from 'sd' to 'da'?
At least this was the impression on freebsd-current@ back when we when
thru this in 1999 (e.g., <36EFF7C2.41C67EA6 at whistle.com>,
<4714.920569143 at verdi.nethelp.no>, <29382.921672594 at verdi.nethelp.no>,
<199903172035.PAA07013 at khavrinen.lcs.mit.edu>).


Now ATA-CAM is the default, why aren't disks devices named by the
established CAM names?

If we're not going to call CAM controlled ATA disks "da", then why not
keep the existing "ad" and "ar" given "ad" stood for "ATA-Disk" and
"ATA-RAID" -- you're still calling the subsystem "ata".

Otherwise, we can just recycle email from 1999 where folks didn't
see much value in the sd->da change.

-- 
-- David  (obrien at FreeBSD.org)