Users guide

Intel® RAID Software User Guide 342
Striping A technique used to write data across all drives in a virtual drive.
Each stripe consists of consecutive virtual drive data addresses that
are mapped in fixed-size units to each drive in the virtual drive using
a sequential pattern. For example, if the virtual drive includes five
drives, the stripe writes data to drives one through five without
repeating any of the drives. The amount of space consumed by a
stripe is the same on each drive. Striping by itself does not provide
data redundancy. Striping in combination with parity does provide
data redundancy.
Subvendor ID A controller property that lists additional vendor ID information about
the controller.
T
Temperature Temperature of the battery pack, measured in Celsius.
U
Uncorrectable error
count
A controller property that lists the number of uncorrectable errors
detected on drives connected to the controller. If the error count
reaches a certain level, a drive will be marked as failed.
V
Vendor ID A controller property indicating the vendor-assigned ID number of
the controller.
Vendor info A drive property listing the name of the vendor of the drive.
Virtual drive A storage unit created by a RAID controller from one or more drives.
Although a virtual drive can be created from several drives, it is seen
by the operating system as a single drive. Depending on the RAID
level used, the virtual drive can retain redundant data in case of a
drive failure.
Virtual drive state A virtual drive property indicating the condition of the virtual drive.
Examples include Optimal and Degraded.
W
Write-back In Write-Back Caching mode, the controller sends a data transfer
completion signal to the host when the controller cache has
received all of the data in a drive write transaction. Data is written to
the drive subsystem in accordance with policies set up by the
controller.
These policies include the amount of dirty/clean cache lines, the
number of cache lines available, and elapsed time from the last
cache flush.
Write policy See Default write policy.
Write-through In Write-Through Caching mode, the controller sends a data
transfer completion signal to the host when the drive subsystem has
received all of the data and has completed the write transaction to
the drive.