Solaris cannot see all drives on Areca RAID controller

[David L Kensiski]

I am running Solaris 10 x86 u6 (10/2008) on a SuperMicro PDSME+ with  
an Areca ARC-1280ML 24-channel RAID controller.  The RAID controller  
is configured in JBOD mode with drives in channels 1 - 8 and 24.  
Solaris can only see the drives on channels 1 through 8.  The RAID  
BIOS says the drive on channel 24 is at SCSI Ch/Id/Lun  : 0/23/0.  I  
have modified /kernel/drv/sd.conf to include entries through target 23:

name="sd" class="scsi" target=0 lun=0;
...
name="sd" class="scsi" target=23 lun=0;

I tried running devfsadm as well as a reconfigure reboot, but still  
cannot see the device at target 23.  How can I expose this drive to  
Solaris?

Thanks,
--Dave