What is ata2 ?

[jason henson]

Rob wrote:

>Joel wrote:
>  
>
>>On Tue, 26 Apr 2005 18:44:18 -0700 (PDT)
>>Rob <spamrefuse at yahoo.com> wrote
>>    
>>
>>>I'm running FreeBSD on a range of PCs, from
>>>Pentium-1 (60 MHz) to Pentium-4 (2.60GHz), though
>>>none but one has a 'ata2' line in the dmesg output:
>>>
>>>ata0: channel #0 on atapci0
>>>ata1: channel #1 on atapci0
>>>...
>>>ata2: <Generic ESDI/IDE/ATA controller> at port
>>>      0x36e-0x36f,0x168-0x16f irq 10 on isa0
>>>ad0: 6149MB <QUANTUM FIREBALL EX6.4A/A0A.0D00>
>>>     [13328/15/63] at ata0-master UDMA33
>>>ad1: 4892MB <QUANTUM FIREBALL EL5.1A/A08.1100>
>>>     [10602/15/63] at ata0-slave UDMA33
>>>acd0: CDROM <GCR-8521B/1.02> at ata1-master PIO4
>>>
>>>What is so special about this particular PC, that
>>>it has an ata2, unlike all other PCs I have?
>>>
>>>Can I add more than 4 disks (2 masters + 2 slaves)
>>>to this PC? Or is this ata2 for something else?
>>>      
>>>
>>From here, with the limited information you've
>>provided, I'm guessing you can, if you have the
>>cables and the spare power connectors.
>>    
>>
>
>I'm quite keen on trying to understand this.
>So let me try to provide more information below.
>
>As above lines show, the ata2 controller is on
>interrupt 10:
>
> # vmstat -i
> interrupt                          total       rate
> irq0: clk                       10392173        100
> irq1: atkbd0                           1          0
> irq3: sio1                           219          0
> irq4: sio0                             1          0
> irq8: rtc                       13301014        128
> irq11: rl0 uhci0                  187119          1
> irq13: npx0                            1          0
> irq14: ata0                       491426          4
> irq15: ata1                           46          0
> Total                           24372000        234
>
>But interrupt 10 is not there !?!
>
> # atacontrol list
> ATA channel 0:
>    Master:  ad0 <QUANTUM FIREBALL EX6.4A/A0A.0D00>
>             ATA/ATAPI revision 4
>    Slave:   ad1 <QUANTUM FIREBALL EL5.1A/A08.1100>
>             ATA/ATAPI revision 4
> ATA channel 1:
>    Master: acd0 <GCR-8521B/1.02> ATA/ATAPI revision 0
>    Slave:       no device present
> ATA channel 2:
>    Master:      no device present
>    Slave:       no device present
>
>----------------------
>
>You also mentioned USB possibility:
> # grep -i usb /var/run/dmesg.boot
> uhci0: <Intel 82371AB/EB (PIIX4) USB controller>
>     port 0xe000-0xe01f irq 11 at device 7.2 on pci0
> usb0: <Intel 82371AB/EB (PIIX4) USB controller>
>     on uhci0
> usb0: USB revision 1.0
>
>
>What would you conclude from this?
>Is this ata2 another IDE controller, so that I can
>add 6 (instead of the normal 4) harddisks/cdroms etc.
>to this computer?
>
>Thanks,
>Rob.
>
>__________________________________________________
>  
>
You have more than 2 controllers.  A whole dmesg would help, or just 
tell us your make/model of your motherboard. 

BTW, vmstat -ia might be usefull, most likely not.