how many disks do I have?

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# 1  
Old 10-31-2001
how many disks do I have?


How do I check how many disks do I have in Solaris & HP-UX?

Also what does this mean

c9t1d5 in /dev/dsk

what is c, t, d etc

# 2  
Old 10-31-2001

In Solaris type the command format , that will show you a list of drives connected to your system.

You can then select the drive # you want to look at and then type p for the partition table, then type another p to print the table. Type q to quit.

As for the c, t, d:

c = controller number, starting at 0

t = target number on that controller, starting at 0

d = disk number at target location

s = slice number on target disk (I know you didn't ask, but...)

(SCSI assumed, although I believe IDE is basically the same)

So, you have:

c9 = Controller 9 on your system board

t1 = #1 target on Controller 9

d5 = 5th disk on Target 1

I hope this makes sense, and if I'm incorrect, someone let me know.

# 3  
Old 10-31-2001

I dont understand what is target of a controller, can you explain a bit?
Also from /dev/dsk we cannot determine the number of disks?

# 4  
Old 10-31-2001
It is a little confusing, and I get confused trying to explain it. I believe I may have mis-spoke about the target in my earlier post. It would be easier if I could draw a diagram for ya, but...

Think of the target as a disk/tape/cdrom connected to a controller card. Here's a definition from a Solaris book I have:

Target Number - Target numbers, such as t0, t1, t2 and t3, correspond to a unique address switch setting that is selected for each disk, tape, or CD-ROM. An external disk drive has an address switch located on the rear panel. An internal disk has address pins that are jumpered to assign its target number. Usually t0 - t3 refer to disks, t4 - t5 is tape, and t6 is CD-ROM.

Whereas the Disk Number is the Logical Unit Number (LUN), which reflects the number of disks at the target location. The disk number is always set to d0 with embedded SCSI disks. Which is what we have on our systems, so I'm not sure how you get d5 on yours.

So, lets say you have 2 controllers with 3 disks on each controller, and you want to talk about the 2nd disk on the 2nd controller. That would be:

c1t1d0 (controller and target numbering starts at 0)

I hope I haven't confused you more!Smilie I'm not too good at explaining things....maybe someone else can put a different spin on it. If I think of another way to explain it, I'll let you know.

As far as /dev/ should be able to cd to that directory and do an ls command and using the naming conventions I showed you, be able to figure out how many disks are there. Remember, all instances of c0t0 is one disk, all instances of c0t1 is another disk, and so on...

Did you try the format command? That will list all drives on your system.

# 5  
Old 10-31-2001
I have those definition from solaris books too but I dont get it!
So t is the number of disks or d...?
I got t5 from HP-UX
# 6  
Old 10-31-2001
Note to pmetal

HTML is allowed in posts, so if you want to make a diagram, just create a little graphic (jpg, gif) and add the link using standard HTML IMG tags. Notice that there is an IMG tag when you post to make it a tiny-bit less typing.
# 7  
Old 11-01-2001
You can also try


df -k


this will show you the disks and their partitions.
Do a little bit of a research
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