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'
Parent topic: ALTER CELL Commands for Setting Attributes