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Full Discussion: how many disks do I have?
Top Forums UNIX for Dummies Questions & Answers how many disks do I have? Post 9636 by pmetal on Wednesday 31st of October 2001 11:16:32 AM
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/dsk....you 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.

peace
 

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GNOME-DISKS(1)							gnome-disk-utility						    GNOME-DISKS(1)

NAME
gnome-disks - the GNOME Disks application SYNOPSIS
gnome-disks [OPTIONS] DESCRIPTION
gnome-disks is the command to launch the GNOME Disks application. Disks provides a way to inspect, format, partition and configure disks and block devices. The Disks application is single-instance. What this means is that if the application is not already running when the gnome-disks command is invoked, it will get launched and the command invocation will block until the application exits. Otherwise the existing application instance will be used and the gnome-disks command will exit immediately. OPTIONS
The following options are understood: --block-device DEVICE Switches to the Disks application and selects the block device given by DEVICE (for example, /dev/sda). --block-device DEVICE --format-device [--xid WINDOW-ID] Shows the "Format Volume" dialog for the block device given by DEVICE (for example, /dev/sdb1). If WINDOW-ID is given, makes the dialog transient to the given XID. --help Prints a short help text and exits. AUTHOR
Written by David Zeuthen <zeuthen@gmail.com> with a lot of help from many others. BUGS
Please send bug reports to either the distribution bug tracker or the upstream bug tracker at https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-disk-utility. SEE ALSO
gnome-disk-image-mounter(1), udisks(8) GNOME
March 2013 GNOME-DISKS(1)
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