Sun Enterprise 450 Server
 

GCS>Sun Microsystems>Servers>Entry-Level Servers
 

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LSU Device Naming Conventions
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Prior to creating any Logical Storage Units (LSU's), Solaris[TM]
will see a disk drive behind the SRC/P card as a typical
Solaris drive. The drive could be formatted and file systems
could be created on each slice. This is unlike our Raid
Manager software which "hides" drives from Solaris. The drive
	is identified behind the raid card by the device path to
the drive. Consider the following format output for a SUN
9.0 gig drive.
c2t2d0
/pci@6,4000/pci@3/scsis@4/mscsi@0,0/sd@2,0
The mscsi@0,0 is the device path identifier for the SRC/P
hardware raid card. Since this is in the path to the drive,
we know the drive is behind the card. The drive will show up
like this until we create a Logical Storage Unit from it.
Once this happens, the device link for c2t2d0 will be
removed.
In the following example, a RAID 1+0 (mirror) will be
created from 6 drives located behind one SRC/P card in an
Sun Enterprise[TM] 450 drive bay. The drive names are...
c3t0d0
c3t1d0
c3t2d0
c2t0d0
c2t1d0
c2t2d0
The resulting Logical Storage Unit will be c2t0d0. c2t0d0
has changed from a SUN 9.0 gig drive into an 27 gig RAID 1+0
mirror. The name is chosen from all the drives being used
to make up the LSU. dptmgr will use the lowest value target
from the lowest value controller from the drives selected.
In this example, c2 was the lowest value controller and t0
was the lowest target value on that controller.
Lastly, the other five disk drive device names will be
removed from the /dev/dsk and /dev/rdsk directories. They
are no longer available as regular drives. Their device
links have become invalid. They have been incorporated into
the Raid Array. dptmgr uses "disks -C" to remove these
unwanted links. This functionality is standard with Solaris[TM] 7
	and available on patch 107665-01 on Solaris[TM] 2.6. If the
disk drive device names are ever required again, the LSU
must be deleted and a boot -r performed.

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