[root@data /home/bachi]# atacontrol list
ATA channel 0:
    Master:      no device present
    Slave:       no device present
ATA channel 1:
    Master:      no device present
    Slave:       no device present
ATA channel 2:
    Master:  ad4 <Maxtor 33073H3/YAH814Y0> ATA/ATAPI revision 6
    Slave:       no device present
ATA channel 3:
    Master:  ad6 <Maxtor 6L300R0/BAJ41G20> ATA/ATAPI revision 7
    Slave:   ad7 <Maxtor 6L300R0/BAJ41G20> ATA/ATAPI revision 7
[root@data /home/bachi]# egrep 'ad[0-9]|cd[0-9]' /var/run/dmesg.boot
ad4: 29312MB <Maxtor 33073H3 YAH814Y0> at ata2-master UDMA100
ad6: 286188MB <Maxtor 6L300R0 BAJ41G20> at ata3-master UDMA100
ad7: 286188MB <Maxtor 6L300R0 BAJ41G20> at ata3-slave UDMA100
Trying to mount root from ufs:/dev/ad4s1a