RAID | Redundant Array of Independent Disks. A collection of disk |
| drives that appear as a single volume to the server and are |
| fault tolerant through mirroring or parity checking. |
request rate | The rate at which requests arrive at a servicing entity. |
route | With respect to a fabric, the communication path between two |
| switches. May also apply to the specific path taken by an |
| individual frame from source to destination. |
routing | The assignment of frames to specific switch ports according to |
| frame destination. |
RR_TOV | Resource recovery |
| device in a loop waits after a LIP before logging out a SCSI |
| initiator. |
RSCN | Registered state change notification. A switch function that |
| allows notification of fabric changes to be sent from the switch |
| to the specified nodes. |
SAN | Storage area network. A network of systems and storage |
| devices that communicate using FC protocols. |
SDRAM | Synchronous dynamic random access memory. The main |
| memory for a switch. See also switch. |
sequence | A group of related frames transmitted in the same direction |
| between two N_ports. |
service rate | The rate at which an entity can service requests. |
single mode | The fiber optic cabling standard that corresponds to distances |
| up to 10 km between devices. |
SNMP | Simple Network Management Protocol. An Internet |
| management protocol that uses either IP for |
| functions and UDP for transport functions, or TCP/IP for |
| both. SNMP can be made available over other protocols |
| (such as UDP/IP) because it does not rely on the underlying |
| communication protocols. See also MIB, trap (SNMP). |
SNS | Simple Name Server. A switch service that stores names, |
| addresses, and attributes for up to 15 minutes, and provides |
| them as required to other devices in the fabric. May also be |
| referred to as a directory service. |
switch | Hardware that routes frames according to FC protocol and is |
| controlled by software. |
84Glossary
