XM Satellite Radio AA-RU5HC-TE Parity bit, Parity check, Password, Physical disk, Portname

Glossary

OSM

Open SAN Manager. A centralized, appliance-based monitoring and management interface that supports multiple applications, operating systems, hardware platforms, storage systems, tape libraries, and SAN-related interconnect devices. It is included with and resides on the Management Appliance, a single aggregation point for data management.

parity

A method of checking if binary numbers or characters are correct by counting the ONE bits. In odd parity, the total number of ONE bits must be odd; in even parity, the total number of ONE bits must be even. Parity information can be used to correct corrupted data.

parity bit

A binary digit added to a group of bits that checks to see if there are errors in the transmission.

parity check

A method of detecting errors when data is sent over a communications line. With even parity, the number of ONE bits in a set of binary data should be even. With odd parity, the number of ONE bits should be odd.

password

A security interlock whose purpose is to allow:

■A management agent control of only certain storage systems

■Only certain management agents control of a storage system

physical disk

A disk drive mounted in a disk drive enclosure that communicates with a controller pair through the device-side Fibre Channel loops. A physical disk is hardware with embedded software, as opposed to a virtual disk, which is constructed by the controllers. Only the controllers can communicate directly with the physical disks.

The physical disks, in aggregate, are called the array and constitute the storage pool from which the controllers create virtual disks.

physical disk array See array.

port

A Fibre Channel connector on a Fibre Channel device.

port_name

A 64-bit unique identifier assigned to each Fibre Channel port. The port_name is communicated during the login and port discovery processes.

120 Command View EVA Storage System Scripting Utility Reference Guide