User guide

Maintenance page
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Maintenance Task Buttons
Below the list of units, a row of task buttons lets you perform maintenance
and configuration tasks related to the unit. Before clicking one of these
buttons, select the appropriate unit.
Verify Unit. Puts the selected unit in verifying mode. If verify scheduling is
enabled on the Scheduling page, the unit will not start actively verifying until
the scheduled time, and the status will indicate “Verify-Paused.” (The Unit
Details page will indicate whether a unit is actively verifying.) If verify
scheduling is not enabled, clicking Verify Unit begins the verification process.
If the unit you selected to verify is a redundant unit, the redundancy of the unit
will be verified. For example it will check parity for a RAID 5 or check data
consistency for a RAID 1. If the unit you checked is not a redundant unit,
verify will do a surface scan of the media. During verification, I/O continues
normally. For RAID 0, single disks, JBODs, and spares, there is only a slight
performance loss. For redundant units, you can set the background task rate
on the Controller Settings page to specify whether more processing time
should be given to verifying or to I/O. For more information, see “About
Verification” on page 146 and “Setting Background Task Rate” on page 155.
While a unit is verifying, the status changes to Verifying and a
Stop Verify
link appears in the right-most column of the Unit Maintenance table.
Rebuild Unit. Replaces a failed drive in a degraded unit with an available
drive and begins rebuilding the RAID. When you select a degraded unit and
click
Rebuild Unit, a dialog box listing available drives appears, so that you
can select the drive you want to use. If the degraded unit has more than one
failed drive (for example, a RAID 10 where both mirrored pairs each have a
failed drive), you will repeat this process a second time.
Warning: Physically removing drives which are not in hotswap carriers can result
in a system hang or may even damage the system and the drive.
Note: If the unit has not previously been initialized and you click Verify Unit, the
initialization process starts. Initialization cannot be halted, so no Stop Verify link
appears. (Initialization can be paused, however, through Scheduling. Initialization
follows the Rebuild schedule, so turning on scheduling for Rebuild will pause
initialization, as well.) For more information about initialization, see “About
Initialization” on page 143.