Users Guide
• To assign or unassign dedicated hot spares:
racadm storage hotspare:<Physical Disk FQDD> -assign <option> -type dhs -vdkey: <FQDD of
VD>
Managing controllers
You can perform the following for controllers:
• Configure controller properties
• Import or auto import foreign configuration
• Clear foreign configuration
• Reset controller configuration
• Create, change, or delete security keys
• Discard preserved cache
Configuring controller properties
You can configure the following properties for the controller:
• Patrol read mode (auto or manual)
• Start or stop patrol read if patrol read mode is manual
• Patrol read unconfigured areas
• Check consistency mode
• Copyback mode
• Load balance mode
• Check consistency rate
• Rebuild rate
• BGI rate
• Reconstruct rate
• Enhanced auto import foreign configuration
• Create or change security keys
You must have Login and Server Control privilege to configure the controller properties.
Patrol read mode considerations
Patrol read identifies disk errors to avoid disk failures, data loss, or corruption. It runs automatically once a week on SAS and SATA HDDs.
The Patrol Read does not run on a physical disk in the following circumstances:
• The physical disk is an SSD.
• The physical disk is not included in a virtual disk or assigned as a hot spare.
• The physical disk is included in a virtual disk that is undergoing one of the following:
• A rebuild
• A reconfiguration or reconstruction
• A background initialization
• A check consistency
In addition, the Patrol Read operation suspends during heavy I/O activity and resumes when the I/O is complete.
NOTE:
For more information on how often the Patrol Read operation runs when in auto mode, see the respective
controller documentation.
NOTE: Patrol read mode operations such as Start and Stop are not supported if there are no virtual disks available in the
controller. Though you can invoke the operations successfully using the iDRAC interfaces, the operations fail when the
associated job is started.
206 Managing storage devices