Dell PowerEdge RAID Controller 9 User’s Guide H330, H730, and H830

The Patrol Read feature is designed as a preventative measure to ensure physical disk health and data integrity. Patrol Read scans and resolves potential problems on configured physical disks. The Dell OpenManage storage management application can be used to start Patrol Read and change its behavior.

The following is an overview of Patrol Read behavior:

• Patrol Read runs on all disks on the controller that are configured as part of a virtual disk, including hot spares.
• Patrol Read does not run on physical disks that are not part of a virtual disk or are in Ready state.
• Patrol Read adjusts the amount of controller resources dedicated to Patrol Read operations based on outstanding disk I/O. For example, if the system is busy processing I/O operation, then Patrol Read uses fewer resources to allow the I/O to take a higher priority.
• Patrol Read does not run on any disks involved in any of the following operations:
  • Rebuild
  • Replace Member
  • Full or Background Initialization
  • CC
  • RLM or OCE
  NOTE:By default, Patrol Read automatically runs every seven days on configured SAS and SATA hard drives.

For more information on Patrol Read, see the Dell OpenManage documentation at Dell.com/openmanagemanuals.