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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
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!
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
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!
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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LEARN ABOUT ULTRIX
scsi
SCSI(4) Kernel Interfaces Manual SCSI(4) Name SCSI - Small Computer System Interconnect Description The ULTRIX system interfaces to disk and tape devices through the Small Computer System Interconnect (SCSI). Initial ULTRIX SCSI support is limited to the Digital-supplied mass storage devices. The following devices are fully supported on the ULTRIX system: o Winchester disks: RZ22, RZ23, RZ23L, RZ24, RZ55, RZ56, RZ57, RX23, RX26, RX33 o Magnetic tapes: TZ30, TZK50, TLZ04, TSZ05, TKZ08, TZK10 o Optical disks: RRD40, RRD42 Under the ULTRIX operating system, a SCSI device is referred to by its logical name. Logical names take the following form: nn# The nn argument is the two-character name; the number sign (#) represents the unit number. The two character names for SCSI devices are: rz - RZ22, RZ23, RZ23L, RZ24, RZ55, RZ56, RZ57, RX23, RX26, RX33, RRD40, RRD42 disks tz - TZ30, TZK50, TLZ04, TSZ05, TKZ08, and TZK10 tapes The unit number is a combination of the SCSI bus number, either 0, 1, ... and the device's target ID number. The unit number is eight times the bus number plus the target ID. For example, an RZ23 disk at target ID 3 on bus 0 would be referred to as rz3; a TZK50 tape at target ID 5 on the second SCSI bus would be referred to as 13. The SCSI bus has eight possible target device IDs. By default, one is allocated to the system. This allows for a maximum of seven target devices connected to a SCSI bus. Restrictions The ULTRIX SCSI device driver does not operate with optical disks, other than the Digital-supplied devices. The SCSI driver attempts to support on a best effort basis, non-Digital-supplied winchester disks and magnetic tapes. The following notes apply to the driver's handling of non-Digital-supplied disks: o These disks are assigned a device type of RZxx, instead of RZ22, RZ23, RZ23L, RZ55, RZ56, RZ57, RX23, RX26, or RX33. The RZxx disks follow the same logical device naming scheme as the Digital-supplied disks. o During the autoconfigure phase of the system startup, the driver prints the contents of the SCSI vendor ID, product ID, and the revision level fields of the inquiry data return by the SCSI device. o RZxx disks are assigned a default partition table. The default table can be modified by editing the sz_rzxx_sizes[8] entry in the file The utility can also be used to modify the partition table on a RZxx disk. o The only logical unit number (LUN) supported for each target ID is 0. See Also rz(4), tz(4), chpt(8) SCSI(4)