Dell 6 series User Manual page 148

PHY
The interface required to transmit and receive data packets transferred across
the serial bus.
Each PHY can form one side of the physical link in a connection with a PHY on
a different SATA device. The physical link contains four wires that form two
differential signal pairs. One differential pair transmits signals, while the other
differential pair receives signals. Both differential pairs operate simultaneously
and allow concurrent data transmission in both the receive and the transmit
directions.
Physical Disk
A non-volatile, randomly addressable device for storing data. Physical disks are
rewritable and commonly referred to as disk drives.
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.
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Glossary