OBP - root / mirror disk syntax Post: 302338445

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Operating Systems Solaris OBP - root / mirror disk syntax Post 302338445 by Sun Fire on Tuesday 28th of July 2009 02:23:56 AM

07-28-2009

Registered User

yes it depends on the hardware.

now, disk@0,0 (or sd@0,0) (sd = scsi disk) doesn't mean disk 0 slice 0

it means t0d0

disk@1,0 means t1d0

and so forth...

now the meaning of "a", "b", "c"...it means the slice

so c0t0d0s0 should be: disk@0,0:a

now, by default, if you don't specify the slice number it will take slice zero.

for example:
disk@0,0 means t0d0s0

disk@0,0:a means also t0d0s0

disk@0,0:f = t0d0s5

disk@1,0:b = t1d0s1

..............................

Now, the rest of the device name depends on the hardware, but there are things in common, take this example of yours:

/devices/pci@8,600000/SUNW,qlc@4/fp@0,0/ssd@w500000e010bfd1d1,0:a

Explanation:

pci@8,60000 = your system bus address
SUNW,qlc = the driver for QLogic card (for example, Emulex cards will look like this SUNW,emlx)...

fp@0,0 = means it's a fiber channel

ssd@w500000e010bfd1d1,0:a = WWN number is w500000e010bfd...

1,0:a = (as you already know) t1, slice 0

.....

all these things are documented by the way...you can go to each server's page in the system handbook, and check the hardware components and then go to the system board section, you should find more in-depth explanations.

so yes it depends on the hardware and the architecture of the system.

---------- Post updated at 01:23 AM ---------- Previous update was at 01:20 AM ----------

And by the way, you can do this to find out your system details:

For example:

Code:

# ls -l /dev/rdsk/c0t0d0s0

it should show you a link to the actual hardware

Sun Fire

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LEARN ABOUT XFREE86

cmdk

cmdk(7D)							      Devices								  cmdk(7D)

NAME

       cmdk - common disk driver

SYNOPSIS

       cmdk@target, lun : [ partition | slice ]

DESCRIPTION

       The  cmdk  device  driver  is  a  common interface to various disk devices. The driver supports magnetic fixed disks and magnetic removable
       disks.

       The block-files access the disk using the system's normal buffering mechanism and are read and written  without	regard	to  physical  disk
       records. There is also a "raw" interface that provides for direct transmission between the disk and the user's read or write buffer. A sin-
       gle read or write call usually results in one I/O operation; raw I/O is therefore considerably more efficient when many bytes are transmit-
       ted. The names of the block files are found in /dev/dsk; the names of the raw files are found in /dev/rdsk.

       I/O  requests  to the magnetic disk must have an offset and transfer length that is a multiple of 512 bytes or the driver returns an EINVAL
       error.

       Slice 0 is normally used for the root file system on a disk, slice 1 as a paging area (for example, swap), and slice 2 for backing  up  the
       entire fdisk partition for Solaris software. Other slices may be used for usr file systems or system reserved area.

       Fdisk partition 0 is to access the entire disk and is generally used by the fdisk(1M) program.

FILES

       /dev/dsk/cndn[s|p]n     block device (IDE)

       /dev/rdsk/cndn[s|p]n    raw device (IDE)

			       where:

			       cn	controller n

			       dn	lun n (0-7)

			       sn	UNIX system slice n (0-15)

			       pn	fdisk partition(0)

       /kernel/drv/cmdk        32-bit kernel module.

       /kernel/drv/amd64/cmdk  64-bit kernel module.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |x86			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fdisk(1M), mount(1M), lseek(2), read(2), write(2), readdir(3C), scsi(4), vfstab(4), attributes(5), dkio(7I)

SunOS 5.10							    9 Oct 2004								  cmdk(7D)