Installation guide

2 Sun StorEdge SAN 4.0 Release Installation Guide • July 2002
Features, Benefits, and Products
This version of the Sun StorEdge SAN product delivers a large high-performing
SAN, with native fabric host connectivity, improved manageability, an integrated
multipathing solution (Sun StorEdge Traffic Management software), and support for
a variety of new hardware and software products.
SAN 4.0 Device Names
Longer, device names in this release require additional planning. SANs and
multipath storage devices require the devices to be addressed by device-specific
static global identifiers, and not by physical port IDs, which are dynamic in nature
and are different across different host’s systems.
Traditionally, Solaris has named storage devices based on the controller, target ID
and logical unit number (LUN) of the device. When large SANs with multiple paths
to large storage arrays are constructed, this naming convention could lead to
thousands of targets per controller and storage identified more than once by
different controllers and targets. The new method incorporates the World Wide
Name of the device into the device name used by the host.
The longer names provide the benefit of uniquely identifying storage devices to the
host. When using the Sun StorEdge Traffic Manager, a device with multiple
connections to a host is known to that host by one name.
Examples
Old device path:
/devices/pci@f,4000/pci@4/SUNW,qlc@4/fp@0,0/ssd@3,0
Sun StorEdge Traffic Manager device path:
/devices/pci@f,4000/pci@4/SUNW,qlc@4/fp@0,0/ssd@w50020f200000225,0.
Old symbolic device name:
/dev/dsk/c4t3d0s2
New symbolic designation:
/dev/dsk/c18t50060E800000000000004E78000000ABd0s2 is a link to
/devices/scsi_vhci/ssd@g50060e800000000000004e78000000ab:c