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146 Glossary
Physical Disk States
A physical disk can be in one of the following states:
• Un-configured Good: A disk accessible to the RAID controller but not
configured as a part of a virtual disk or as a hot spare.
• Hot Spare: A physical disk that is configured as a hot spare.
• Online: A physical disk can be accessed by the RAID controller and is a part of
the virtual disk.
• Rebuild: A physical disk to which data is being written to restore full redundancy
for a virtual disk.
• Failed: A physical disk that was originally configured as Online or Hot Spare, but
on which the firmware detects an unrecoverable error.
• Un-configured Bad: A physical disk on which the firmware detects an
unrecoverable error; the physical disk was Un-configured Good or the physical
disk could not be initialized.
• Missing: A physical disk that was Online, but which has been removed from its
location.
• Offline: A physical disk that is part of a virtual disk but which has invalid data as
far as the RAID configuration is concerned.
• None: A physical disk with the unsupported flag set. An Un-configured Good or
Offline physical disk that has completed the prepare for removal operation.
Protocol
A set of formal rules describing how to transmit data, generally across a network
or when communicating with storage subsystems. Low-level protocols define
the electrical and physical standards to be observed, bit- and byte-ordering, and
the transmission and error detection and correction of the bit stream. High-level
protocols deal with the data formatting, including the message syntax, the
terminal to system dialogue, character sets, sequencing of messages, etc.
Dell_PERC6.1_UG.book Page 146 Wednesday, April 15, 2009 4:18 PM