One of the following screens will appear:
- If the configuration program detects unconfigured
ServeRAID controllers, the program starts in the Configuration mode and
a screen similar to the following appears.
Select the Cancel button to switch from the Configuration mode to the Information mode. - If the configuration program detects that all
ServeRAID adapters and controllers in the server are configured, the
program starts in the Information mode and a screen similar to the
following appears.
Select the
icon on the Tool Bar to switch from the Information mode to the Configuration mode.
This choice is available in the Information mode when you select a specific logical drive icon from the Main Tree.
When this feature is set to the write-through mode, the completion status of a write command is sent after the data is written to the hard disk drive. Under certain workloads, you can improve performance by changing this setting to the write-back mode, where the completion status of a write command is sent after the data is copied to cache memory, but before the data is actually written to the storage device.
-Attention-
- You might lose data if a power outage occurs while using the write-back mode without a Battery-Backup Cache device.
- If you do not have a Battery-Backup Cache installed and Enabled and you set this feature to the write-back mode, wait at least 10 seconds after your last operation before you turn off your system. Failure to follow this practice can result in lost data.
This choice is available in the Information mode only. When read-ahead cache is set to Enabled (default setting), the ServeRAID controller transfers data from a disk to its local cache in increments equal to the stripe unit size. This provides excellent overall performance when workloads are steady and sequential.
However, if the workload is random or the system I/O requests are smaller than the stripe unit size, reading ahead to the end of the stripe might degrade performance. When read-ahead cache is set to Disabled , the ServeRAID controller transfers data from a disk to local cache in increments equal to the system I/O request size, without reading ahead to the end of the stripe.
This choice is available in the Information mode only. You can select this choice to set the priority for Rebuild operations to High (default), Medium , or Low .
- When the rebuild rate is set to High , the rebuild I/O request gets high priority in the execution order.
- When the rebuild request is set from High to Medium in a heavily-loaded system, it can increase the rebuild time, but provide better system performance.
- When the rebuild request is set from High or Medium to Low in a moderately- to heavily-loaded system, it can increase the disk rebuild time, but provides better system performance.
