3Ware 8506-4LP User Guide - Page 48

Rebuilding a RAID 5 disk array, DEGRADED, In Use, Disk Array Configuration Utility, Not in Use

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3ware Disk Array Configuration Utility Rebuilding a RAID 5 disk array Escalade ATA RAID Controllers 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 or is not displayed if no longer available (see Figure 20). When running in Degraded mode, the missing data is reconstructed from all nondegraded 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 20. 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.) Rebuilding a mirrored or RAID 5 array with no hot spare 1 Reboot the system and enter the Disk Array Configuration Utility. 2 If your mirrored or RAID 5 array has a Not in Use member drive, the drive may still be usable. Try rebuilding with the Not in Use drive intact. Simply select the array and then the Rebuild button. The Rebuild Disk Array screen appears, showing the "Continue on source error" field. This field lets you specify whether or not you want rebuilding to continue if it encounters a source error. The default is "disable." 40 3ware Escalade ATA RAID Controller User Guide

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3ware Disk Array Configuration Utility
40
3ware Escalade ATA RAID Controller User Guide
Rebuilding a RAID 5 disk array
Escalade ATA RAID Controllers 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
or
is not displayed if no longer available
(see Figure 20). When run-
ning in Degraded mode, the missing data is reconstructed from all non-
degraded drives.
Figure 20.
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.)
Rebuilding a mirrored or RAID 5 array with no hot spare
1
Reboot the system and enter the
Disk Array Configuration Utility
.
2
If your mirrored or RAID 5 array has a
Not in Use
member drive, the
drive may still be usable. Try rebuilding with the
Not in Use
drive intact.
Simply select the array and then the
Rebuild
button.
The Rebuild Disk Array screen appears, showing
the “Continue on
source error” field. This field lets you specify whether or not you
want rebuilding to continue if it encounters a source error. The
default is “disable.”
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