7.7.1.2.4.5 Disk Scrubbing Attributes

Configuring Disk Scrubbing Attributes

Disk scrubbing proactively inspects and repairs hard disks. If a bad sector is detected on a hard disk, Oracle Exadata System Software automatically orchestrates the repair using data from another mirror copy.

Disk scrubbing is a long-running operation. The time required to complete a scrubbing operation depends mainly on disk size and workload. As a guide, allow between 1 and 2 hours for each terabyte of disk capacity to scrub an otherwise idle disk.

On an idle system, disk scrubbing can drive disk utilization to 100%. However, Exadata I/O Resource Management (IORM) throttles disk scrubbing so that user workloads are prioritized and should not be affected by disk scrubbing.

The ALTER CELL hardDiskScrubInterval command activates (or deactivates) automatic scrubbing and sets the scrubbing interval. Valid options are daily, weekly, biweekly, and none. Using the none option stops all active disk scrubbing operations and deactivates automatic scrubbing.

The ALTER CELL hardDiskScrubStartTime command sets the start time for the scrubbing schedule. Valid options are a specific date and time or now.

In the alert log, you may see messages such as Begin scrubbing celldisk and Finished scrubbing celldisk. These are expected informational messages, and no action is necessary.

Example 7-25 Setting the Disk Scrubbing Interval to Weekly

This example shows how to activate automatic weekly disk scrubbing.

CellCLI> ALTER CELL hardDiskScrubInterval=weekly

Example 7-26 Setting the Start Time for Proactive Disk Scrubbing

This example shows how to set a specific start time for disk scrubbing.

CellCLI> ALTER CELL hardDiskScrubStartTime='2013-08-07T21:19:22-07:00'