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In computer storage, a logical unit number, or LUN, is a number used to identify a logical unit, which is a device addressed by the SCSI protocol or protocols which encapsulate SCSI, such as Fibre Channel or iSCSI
RAID (originally redundant array of inexpensive disks; now commonly redundant array of independent disks) is a data storage virtualization technology that combines multiple disk drive components into a logical unit for the purposes of data redundancy or performance improvement.
A storage area network (SAN) is a dedicated network that provides access to consolidated, block level data storage. SANs are primarily used to enhance storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear like locally attached devices to the operating system. A SAN typically has its own network of storage devices that are generally not accessible through the local area network (LAN) by other devices. The cost and complexity of SANs dropped in the early 2000s to levels allowing wider adoption across both enterprise and small to medium sized business environments.
- SPs provide front‐side host attachments to the storage devices from the servers, either
- directly or through a switch. The server HBAs must conform to the protocol supported
- by the storage processor. In most cases, this is the FC protocol.
SAN Ports and Port Naming
- In the context of this document, a port is the connection from a device into the
- SAN. Each node in the SAN. each host, storage device, and fabric component
- (router or switch).has one or more ports that connect it to the SAN. Ports can be
- identified in a number of ways:
- ! WWPN . World Wide Port Name. A globally unique identifier for a port which
- allows certain applications to access the port. The FC switches discover the WWPN
- of a device or host and assign a port address to the device.
- ! Port_ID (or port address) . Within the SAN, each port has a unique port ID that
- serves as the FC address for the port. This enables routing of data through the SAN
- to that port. The FC switches assign the port ID when the device logs into the
- fabric. The port ID is valid only while the device is logged on.
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