Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 351
current write, policy, default write, device ID, device port, count, drive cache, drive group
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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
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