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142 Glossary
Inter-IC
Inter-IC, also known as I
2
C, is a multi-master bus, meaning that more than one
chip can be connected to the same bus. Each chip can act as a master and
initiate a data transfer.
L
Load-balancing
Load balancing is a method of spreading work between two or more computers,
network links, CPUs, physical disk drives, or other resources. Load balancing is
used to maximize resource use, throughput, or response time. In the PERC 6
controllers, the balancing service is performed by the firmware.
You can choose between a single path for load balancing, and a “round-robin”
load balancing scheme. In single path, the firmware can detect multiple paths to
a device, and use only a single path for I/O activity to that device. The secondary
path is used if a failure is detected on the primary path.
In a simple round-robin scheme, if load balancing is enabled for the controller,
the firmware implements a round-robin scheme to issue I/Os to the redundant
path device. The round-robin scheme issues one I/O down one path, and the
other I/O down the second path, and so on. There is no restriction on firmware
regarding which path to choose first. If load balancing is disabled, the firmware
can use any one of the available paths to issue I/Os, and it should continue to
use the same path for all further I/O activity. On reboot or path failure, the
firmware again chooses any available path.
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.
M
MB
Acronym for megabyte(s). The term
megabyte
means 1,048,576 bytes (2^20 bytes);
however, when referring to hard drive storage, the term is often rounded to
mean 1,000,000 bytes.
Dell_PERC6.1_UG.book Page 142 Wednesday, April 15, 2009 4:18 PM