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Glossary 149
Typically, a physical disk fails or is expected to fail, and the data is rebuilt on a hot
spare. The failed physical disk is replaced with a new disk. Then the data is copied
from the hot spare to the new physical disk, and the hot spare reverts from a
rebuild drive to its original hot spare status. The Replace Member operation runs
as a background activity, and the virtual disk is still available online to the host.
Replacement Disk
A physical disk replacing a failed member disk in a virtual disk.
Replacement Unit
A component or collection of components in a system or subsystem that is
always replaced as a unit when any part of the collection fails. Typical
replacement units in a disk subsystem include disks, controller logic boards,
power supplies and cables.
Revertible Hot Spare
When you use the Replace Member procedure, after data is copied from a
hot spare to a new physical disk, the hot spare reverts from a rebuild drive to
its original hot spare status.
RPM
Acronym for Red Hat Package Manager. RPM is a software manager used to
install, remove, query, and verify the software on your system. RPMs are used in
the driver update procedures for Red Hat Enterprise Linux and SUSE LINUX
Enterprise Server (SLES).
S
SAS
Acronym for Serial Attached SCSI. SAS is a serial, point-to-point,
enterprise-level device interface that leverages the proven Small Computer
System Interface (SCSI) protocol set. The SAS interface provides improved
performance, simplified cabling, smaller connectors, lower pin count, and lower
power requirements when compared to parallel SCSI. PERC 6 controllers
leverage a common electrical and physical connection interface that is
compatible with Serial ATA technology.
Dell_PERC6.1_UG.book Page 149 Wednesday, April 15, 2009 4:18 PM