Upon completion of this module, you should be able to:
Describe the features of various system bus architecure
Describe the features of input and output(I/O) channels, small computer systems interface(SCSI),and the
Fibre Channel-Arbitrated Loop(FC-AL)
Describe Sun-supported redundant array of independent disks(RAID) schemes
Describe the fundamental purpose and function of alternate-pathing solutions
SCSI Addressing
A SCSI target is a device controller, not a device
There are 8 unique targets on a narrow bus, 16 on a wide bus
Each target supports eight LUNs or devices
The t#d# scheme identifies the target and LUN addresses
SCSI commands are issued by initiators:
The most common initiator is the host adapter
Host adapters do not have LUNs
There are 57(narrow) or 121(wide) positions on the bus
Fibre Channel Technologies
Sun StorEdge system approach:
High bandwidth FC-AL to replace SCSI
Simple, flexible, serial networks
High-speed, bidirectional optical cable
Capable of data-transfer rates of up to 100 Mbytes per second
Ability to support up to 126 FC-AL devices on a single host adapter
Disk Storage Arrays
A disk storage array is a collection of disks combined with an array management function
An array management function controls the disk' operation and presents their storage capacity to hosts
as one or more virtual disks
Benefits of disk storage array include:
Improved I/O performance
High date availability
Simplified storage management
Storage arrays typically use disk drives from the following types:
SCSI-1 - Narrow, 8-bit
SCSI-2 - Wide, 16-bit
SCSI-3 - UltraWide SCSI
SCSI-FCP - FC-AL
FC-AL disk drives are the only drives currently supporting dual-ported access
RAID 0-Disk striping
RAID 1-Mirroring
RAID 2-Hamming code correction
RAID 3-Striping with dedicated parity
RAID 4-Independent reads and writes
RAID 5-Striping with distributed parity
RAID 6-Striping with distributed parity and check data
The Veritas DMP code in Veritas Volume Manager 3.0.2c has been specially modified to support the design
and operational aspects of the Sun StorEdge T3 product. The Sun StorEdge T3 device type is recognized by
Veritas Volume Manager through a device inquiry operation, which is performed by its vxconfigd daemon
any time vxdctl enable is invoked
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