3ware Disk Array Configuration Utility40 3ware Escalade ATA RAID Controller User GuideRebuilding a RAID 5 disk arrayEscalade ATA RAID Controllers allow you to create fault tolerant RAID 5disk arrays. These disk arrays achieve fault tolerance by using a simple(exclusive OR) function to generate the parity data that is distributed on alldrives. If one of the drives is removed, unplugged or fails on read or writerequests, the array is marked as DEGRADED and the drive is marked as NotIn 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 UseAs in the case of RAID 1 and 10 arrays RAID 5 arrays allow you to read andwrite data from a degraded disk array, but the array will not be fault tolerantuntil it is rebuilt using the Rebuild feature. (Refer to the 3ware Disk ArrayConfiguration Utility or 3DM Disk Management Utility chapters for moreinformation.)Rebuilding a mirrored or RAID 5 array with no hot spare1 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, thedrive 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 onsource error” field. This field lets you specify whether or not youwant rebuilding to continue if it encounters a source error. Thedefault is “disable.”Restore Initial ValuesPrevious/Next Toggle Hot SpareCancelSelect/DeselectDoneAlt-F1F6EnterF8$EscHelp3 w a r e D i s k A r r a y C o n f i g u r a t i o nCreate Array Delete Array Maintain Array Rebuild ArrayAvailable Drives:Port 0 - QUANTUM FIREBALLP KX27.3 512 MDisk Arrays:Array Unit 1 - 3 drive 64K RAID 5 1.0GB DEGRADEDPort 1 - IBM-DTLA-387815 512 MPort 2 - IBM-DTLA-387815 512 M Not in UsePort 3 - IBM-DTLA-387815 512 M
