Slow disk performance of the repository when the repository is located on local storage or DAS (Direct Attach Storage) connected to a Dell PERC disk controller.
How to identify this problem:
The Controller Cache is Disabled or not set to the optimal performance for a Rapid Recovery Repository. You can check the settings from OMSA (Dell OpenManage Server Administrator) | Storage | Virtual Disks. The Read Policy is set to: No Read Ahead and the Write Policy is set to: Write Through.
NOTE: Previous generations of PERC controllers support read policy settings of No Read Ahead , Read Ahead, and Adaptive Read Ahead. With PERC 8 and PERC 9, the Read Ahead and Adaptive Read Ahead settings are functionally equivalent at the controller level. For backward compatibility purposes, some systems management interfaces and PERC 8 and 9 controllers still allow setting the read policy to Adaptive Read Ahead. While it is possible to set Read Ahead or Adaptive Read Ahead on PERC 8 or PERC 9, there is no functional difference.
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