3Ware 3W-6800 User Guide - Page 49

Rebuilding a RAID 5 disk array, Degraded RAID 5 Array Drive When Not in Use

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3ware Disk Array Configuration Utility Rebuilding a RAID 5 disk array Escalade Storage Switches allow you to create fault tolerant RAID 5 disk arrays. These disk arrays achieve fault tolerance by using a simple (exclusive OR) function to generate the parity data that is distributed on all drives. If one of the drives is removed, unplugged or fails on read or write requests, the array is marked as DEGRADED and the drive is marked as Not In Use (see Figure 17). When running in Degraded mode, the missing data is reconstructed from all non-degraded drives. 3ware Disk Array Configuration Available Drives: Port 0 - QUANTUM FIREBALLP KX27.3 Disk Arrays: Array Unit 1 - 3 drive 64K RAID 5 Port 1 - IBM-DTLA-387815 Port 2 - IBM-DTLA-387815 Port 3 - IBM-DTLA-387815 512 M 1.0GB 512 M 512 M 512 M DEGRADED Not in Use Create Array Delete Array Maintain Array Rebuild Array Alt-F1 Help Previous/Next $ Toggle Hot Spare EnterSelect/Deselect F6 Restore Initial Values Esc Cancel F8 Done Figure 17. Degraded RAID 5 Array Drive When Not in Use As in the case of RAID 1 and 10 arrays RAID 5 arrays allow you to read and write data from a degraded disk array, but the array will not be fault tolerant until it is rebuilt using the Rebuild feature. (Refer to the 3ware Disk Array Configuration Utility or 3DM Disk Management Utility chapters for more information.) www.3ware.com 39

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3ware Disk Array Configuration Utility
www.3ware.com
39
Rebuilding a RAID 5 disk array
Escalade Storage Switches allow you to create fault tolerant RAID
5 disk arrays. These disk arrays achieve fault tolerance by using a
simple (exclusive OR) function to generate the parity data that is
distributed on all drives. If one of the drives is removed, unplugged
or fails on read or write requests, the array is marked as
DEGRADED
and the drive is marked as
Not In Use
(see
Figure 17). When running in Degraded mode, the missing data is
reconstructed from all non-degraded drives.
Figure 17.
Degraded RAID 5 Array Drive When Not in Use
As in the case of RAID 1 and 10 arrays RAID 5 arrays allow you to
read and write data from a degraded disk array, but the array will
not be fault tolerant until it is rebuilt using the Rebuild feature.
(Refer to the
3ware Disk Array Configuration Utility
or
3DM Disk
Management Utility
chapters for more information.)
Restore Initial Values
Previous/Next
Toggle Hot Spare
Cancel
Select/Deselect
Done
Alt-F1
F6
Enter
F8
$
Esc
Help
3ware Disk Array Configuration
Create Array
Delete Array
Maintain Array
Rebuild Array
Available Drives:
Port 0 - QUANTUM FIREBALLP KX27.3
512 M
Disk Arrays:
Array Unit 1 - 3 drive
64K RAID 5
1.0GB
DEGRADED
Port 1 - IBM-DTLA-387815
512 M
Port 2 - IBM-DTLA-387815
512 M
Not in Use
Port 3 - IBM-DTLA-387815
512 M