User manual

Background actIvIty
Background activity includes monitoring for data integrity and
hard drive performance. To see which processes are active, and to
configure others for use, click the Background Activity menu item
on the Administration tab. You will then have access to the following
functions:
mediA pAtrol
Media Patrol monitors the condition of the media, not the data
recorded on the media. This routine maintenance procedure checks the
magnetic media on all physical drives assigned to disk arrays and spare
drives; it does not check unconfigured drives. Media Patrol is enabled
by default on all disk arrays and spare drives. Disabling is allowed but
not recommended. If Predictive Data Migration (PDM) is enabled on
the disk array and Media Patrol encounters a critical error, Media Patrol
will trigger PDM. Media Patrol has three status conditions:
• Running—Normal. You can access your logical drives at any time.
• Yield—Temporary pause while a read/write operation takes place.
• Paused—Temporary pause while another background runs, or a
pause initiated by the user.
redundAnCy CHeCk
Redundancy Check is a routine maintenance procedure for fault-
tolerant logical drives, ensuring that all data matches exactly. It can
also correct inconsistencies. To run Redundancy Check on a logical
drive:
1. From the Administration tab, click the Background Activity menu
item.
2. Move your pointer over the Redundancy Check item and click the
Start button.
3. Check the boxes to the left of the logical drives you want to run,
then check the options you want:
• Auto Fix—Attempt to repair the problem when an error is found
• Pause on Error—Stop the process stops when a non-repairable
error is found
4. Click the Confirm button.
While the redundancy check is in progress, you can stop, pause or
resume the process. Move your pointer over the buttons for these
options, and click to activate.
rebuild
When a physical drive in a disk array fails and a spare drive of adequate
capacity is available, the disk array begins to rebuild automatically using the
spare drive.
• If the Auto Rebuild function is enabled but there is no suitable spare
drive, the disk array begins to rebuild automatically as soon as you
remove the failed physical drive and install an unconfigured physical
drive in the same slot.
• If the Auto Rebuild function is disabled and there is no suitable spare
drive, you must replace the failed drive with an unconfigured physical
drive, then perform a Manual Rebuild.
migrAtion
Migration means changing the RAID level of a logical drive, expanding the
storage capacity of a logical drive, or both. Before you begin a migration,
examine your current disk array to determine whether:
• The physical drives in your array can support the target RAID level
• There is sufficient capacity to accommodate the target logical drive size
If you need to add physical drives to your array, be sure you have unassigned
physical drives installed in your DataGuard Appliance before you begin
migration.
Administration > Background Activity
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