> From: tom scott <[EMAIL PROTECTED]>
> Date: 2005/03/09 Wed AM 08:50:33 CST
>
> On Wed, 2005-03-09 at 09:02, Christo Pretorius wrote:
> > You have a scsi controller c? and a target on the controller t? and then
> > last the disk d? at that target.
>
> thanks for responding. I think i understand what each letter stands
> for (c = controller, t = target, d = device, s = slice), but I don't
> know what they actually are. The controller and slices are not so
> mysterious to me but i'd like to know more about the target and
> device.
Tom,
Looks like you've got C figured out okay, that's the controller. On each
controller, you can have a certain number of devices, 2 (IDE), 7 (SCSI), 15
(SCSI3), or 128 (USB). The device is labeled as Target, or t. For each
target, you can have just about any number of Devices, but on a disk drive,
it's always 1, so it's d0. So, assuming you have two SCSI controllers in your
system, each with 3 drives, the third drive on the second controller is c1t2d0,
with partitions being s0-s7.
Now, for fun, let's throw a third controller in there, and it has a tape
autoloader system on ID3. So, that becomes c2t4, with the tape drive as d0
(usually) and the autoloader device as d1 (usually). So, in the case of a
robotic tape device, you'll have multiple D's, but no S's.
c0t0d0 First disk on first controller
c1t2d0 Third disk on second controller
c2t4d0 Tape drive on tape autoloader on third controller
c2t4d1 Robotic arm on tape autoloader on third controller
> -- Thanks, TT
Hope this doesn't add too much confusion to the subject,
amonotod
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