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VTrak 15110 User Manual
122
an array is called "expansion". Because migration and expansion are closely
related, the Migration feature handles both. Note that the available target
RAID levels depend on the number physical drives in the current array and
the number of free physical drives.
• Manual Rebuild – When you rebuild a fault-tolerant disk array, you are
actually rebuilding the data on one disk drive. Normally, a disk array would
rebuild itself after going Critical. However, if the Auto Rebuild function is
disabled, you must initiate the procedure.
• Synchronization – Synchronization is a routine maintenance procedure for
fault-tolerant disk arrays (those with redundancy) that ensures all the data
matches exactly. You can initiate this procedure automatically through the
Synchronization Schedule. See Scheduler, below.
• Redundancy Check – Redundancy Check is a routine maintenance
procedure for fault-tolerant disk arrays(those with redundancy) that ensures
all the data matches exactly. Unlike Synchronization, Redundancy Check
only checks and reports, it does not correct inconsistencies.
• PDM – Predictive Data Migration (PDM) is the migration of data from the
suspect disk drive to a spare disk drive, similar to Rebuilding a fault-tolerant
disk array. Unlike Rebuilding a Logical Drive, PDM copies your data to a
spare disk drive before the original disk drive fails and your Logical Drive
goes Critical. You can configure PDM to run automatically.
Fault-tolerant disk arrays include RAID 1, 3, 5, 10 and 50. RAID 0 and JBOD are
not fault-tolerant. For more information, see Chapter 7.
Scheduler
The Disk Array–Scheduler tab enables you to schedule synchronization for an
individual disk array. Synchronization is a routine maintenance procedure for
fault-tolerant disk arrays (those with redundancy) that ensures all the data
matches exactly. You can also initiate synchronization manually. See
Background Activity, above.
To set the scheduler:
1. Click on the Subsystem icon in Tree View.
2. Click on the VTrak icon.
3. Click on the Disk Arrays icon.
4. Click on the Disk Array icon.
5. Click on the Scheduler tab.
6. From the dropdown menu on the Scheduler tab, select Array
Synchronization.