Lenovo ThinkServer RD240 Software User's Manual page 351

current write
policy
default write
policy
device ID
device port
count
drive cache
policy
drive group
drive state
configuration for a drive group (for example, a specific arrangement of
drive group members on the device I/O buses). The copyback operation
can be run automatically or manually.
Typically, a drive fails or is expected to fail, and the data is rebuilt on a
hot spare. The failed drive is replaced with a new drive. Then the data is
copied from the hot spare to the new drive, and the hot spare reverts
from a rebuild drive to its original hot spare status. The copyback
operation runs as a background activity, and the virtual drive is still
available online to the host.
A virtual drive property that indicates whether the virtual drive currently
supports Write Back mode or Write Through mode.
•
In Write Back mode the controller sends a data transfer completion
signal to the host when the controller cache has received all of the
data in a transaction.
•
In Write Through mode the controller sends a data transfer
completion signal to the host when the drive subsystem has received
all of the data in a transaction.
A virtual drive property indicating whether the default write policy is Write
Through or Write Back. In Write Back mode the controller sends a data
transfer completion signal to the host when the controller cache has
received all of the data in a transaction. In Write Through mode the
controller sends a data transfer completion signal to the host when the
drive subsystem has received all of the data in a transaction.
A controller or drive property indicating the manufacturer-assigned device
ID.
A controller property indicating the number of ports on the controller.
A virtual drive property indicating whether the virtual drive cache is
enabled, disabled, or unchanged from its previous setting.
A group of drives attached to a RAID controller on which one or more
virtual drives can be created. All virtual drives in the drive group use all
of the drives in the drive group.
A drive property indicating the status of the drive. A drive can be in one
of the following states:
B-3