Dell 341-7212 User Guide - Page 91

Failed, Optimal, Degraded, SubVendor ID, Uncorrectable Error Count, virtual disk VD, write-back

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SubVendor ID A controller property that lists additional vendor ID information about the controller. Uncorrectable Error Count A controller property that lists the number of uncorrectable errors detected on physical disks connected to the controller. If the error count reaches a certain level, a physical disk will be marked as Failed. Vendor ID A controller property indicating the vendor-assigned ID number of the controller. Vendor Info A physical drive property listing the name of the vendor of the drive. virtual disk (VD) A storage unit created by a RAID controller from one or more physical disks. Although a virtual disk can be created from several physical disks, it is seen by the operating system as a single disk. Depending on the RAID level used, the virtual disk can retain redundant data in case of a disk failure. Virtual Disk State A virtual disk property indicating the condition of the virtual disk. Examples include Optimal and Degraded. 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 the data in a disk write transaction. Data is written to the disk 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. Glossary 91

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Glossary
91
SubVendor ID
A controller property that lists additional vendor ID information about the
controller.
Uncorrectable Error Count
A controller property that lists the number of uncorrectable errors detected on
physical disks connected to the controller. If the error count reaches a certain
level, a physical disk will be marked as
Failed
.
Vendor ID
A controller property indicating the vendor-assigned ID number of the
controller.
Vendor Info
A physical drive property listing the name of the vendor of the drive.
virtual disk (VD)
A storage unit created by a RAID controller from one or more physical disks.
Although a virtual disk can be created from several physical disks, it is seen by
the operating system as a single disk. Depending on the RAID level used, the
virtual disk can retain redundant data in case of a disk failure.
Virtual Disk State
A virtual disk property indicating the condition of the virtual disk. Examples
include
Optimal
and
Degraded
.
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 the data in a disk
write transaction. Data is written to the disk 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.