IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

Using the ServeRAID GUI-Based Configuration CD

1.  Insert the ServeRAID GUI-Based CD into the  CD-ROM drive, then, turn on the server.

    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 or 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.

2.  Disable or Enable Read-Ahead Cache Mode:

    This choice is available in the Information mode only. When read-ahead cache is set to Enabled  (default setting), the ServeRAID adapter/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 adapter/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.

3.  Change the Rebuild Rate:

    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.

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