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System Administration Guide, Volume 1

How to Identify the Disks on a System

  1. Become superuser.

  2. Identify the disks that are recognized on the system with the format utility. 


    # format

    The format utility displays a list of disks that it recognizes under AVAILABLE DISK SELECTIONS.

Examples--Identifying the Disks on a System

The following format output is from a system with two disks.


# format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
  0. c0t1d0 <SUN1.05 cyl 2036 alt 2 hd 14 sec 72>
     /iommu@f,e0000000/sbus@f,e0001000/espdma@f,400000/esp@f,800000/sd@1,0
  1. c0t3d0 <SUN1.05 cyl 2036 alt 2 hd 14 sec 72>
     /iommu@f,e0000000/sbus@f,e0001000/espdma@f,400000/esp@f,800000/sd@3,0
Specify disk (enter its number):

The format output associates a disk's physical and local device name to the disk's marketing name which appears in angle brackets <>. This is an easy way to identify which local device names represent the disks connected to your system. See Chapter 26, Accessing Devices (Overview) for a description of local and physical device names.

The following example uses a wildcard to display the disks connected to a second controller.


# format /dev/rdsk/c2*
AVAILABLE DISK SELECTIONS:
  0. /dev/rdsk/c2t0d0s0 <SUN2.1G cyl 2733 alt 2 hd 19 sec 80>
     /io-unit@f,e0200000/sbi@0,0/QLGC,isp@2,10000/sd@0,0
  1. /dev/rdsk/c2t1d0s0 <SUN2.1G cyl 2733 alt 2 hd 19 sec 80>
     /io-unit@f,e0200000/sbi@0,0/QLGC,isp@2,10000/sd@1,0
  2. /dev/rdsk/c2t2d0s0 <SUN2.1G cyl 2733 alt 2 hd 19 sec 80>
     /io-unit@f,e0200000/sbi@0,0/QLGC,isp@2,10000/sd@2,0
  3. /dev/rdsk/c2t3d0s0 <SUN2.1G cyl 2733 alt 2 hd 19 sec 80>
     /io-unit@f,e0200000/sbi@0,0/QLGC,isp@2,10000/sd@3,0
  4. /dev/rdsk/c2t5d0s0 <SUN2.1G cyl 2733 alt 2 hd 19 sec 80>
     /io-unit@f,e0200000/sbi@0,0/QLGC,isp@2,10000/sd@5,0
Specify disk (enter its number):

The following example identifies the disks on a SPARC based system.


# format
AVAILABLE DISK SELECTIONS:
  0. c0t3d0 <SUN2.1G cyl 2733 alt 2 hd 19 sec 80>
     /iommu@0,10000000/sbus@0,10001000/espdma@5,8400000/esp@5,8800000/sd@3,0
Specify disk (enter its number):

The format output identifies that disk 0 (target 3) is connected to the first SCSI host adapter (espdma@...), which is connected to the first SBus device (sbus@0...). The output also associates both the physical and logical device name to the disk's marketing name, SUN02.1G.

The following example identifies the disks on an IA based system.


# format
AVAILABLE DISK SELECTIONS:
  0. c0d0 <DEFAULT cyl 615 alt 2 hd 64 sec 63>
     /pci@0,0/pci-ide@7,1/ata@0/cmdk@0,0
  1. c0d1 <DEFAULT cyl 522 alt 2 hd 32 sec 63>
     /pci@0,0/pci-ide@7,1/ata@0/cmdk@1,0
  2. c1d0 <DEFAULT cyl 817 alt 2 hd 256 sec 63>
     /pci@0,0/pci-ide@7,1/ata@1/cmdk@0,0
Specify disk (enter its number):

The format output identifies that disk 0 is connected to the first PCI host adapter (pci-ide@7...), which is connected to the ATA device (ata...). The format output on an IA based system does not identify disks by their marketing names.

Where to Go From Here

Check the following table if the format utility did not recognize the disk.

If the Disk ... 

Then ... 

Is newly added and you didn't perform a reconfiguration boot 

Go to Chapter 30, SPARC: Adding a Disk (Tasks) or Chapter 31, IA: Adding a Disk (Tasks).

Is a third-party disk 

Go to "Creating a format.dat Entry".

Label was corrupted by a system problem, such as a power failure 

Go to "How to Label a Disk".

Is not properly connected to the system 

Connect the disk to the system using your disk hardware documentation.