LSI MegaRAID Express 500 - Manual (Page 139)

Glossary 125
Glossary, Continued
Logical Disk A set of contiguous chunks on a physical disk. Logical disks are used in array
implementations as constituents of logical volumes or partitions. Logical disks are
normally transparent to the host environment, except when the array containing them is
being configured.
Logical Drive A virtual drive within an array that can consist of more than one physical drive. Logical
drives divide the contiguous storage space of an array of disk drives or a spanned group
of arrays of drives. The storage space in a logical drive is spread across all the physical
drives in the array or spanned arrays. Configure at least one logical drive for each array.
Mapping The conversion between multiple data addressing schemes, especially conversions
between member disk block addresses and block addresses of the virtual disks presented
to the operating environment by Array Management Software.
MB (Megabyte) An abbreviation for 1,000,000 (10 to the sixth power) bytes. It is the same as
1,000 KB (kilobytes).
Multi-threaded Having multiple concurrent or pseudo-concurrent execution sequences. Used to describe
processes in computer systems. Multi-threaded processes allow throughput-intensive
applications to efficiently use a disk array to increase I/O performance.
Operating Environment The operating environment includes the host computer where the array is
attached, any I/O buses and adapters, the host operating system, and any additional
software required to operate the array. For host-based arrays, the operating environment
includes I/O driver software for the member disks, but does not include Array
Management Software, which is regarded as part of the array itself.
Cont’d