D-Link DSN-656 User Manual - Page 129

Fast Rebuild, Solution

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D-Link Document - User Manual Fast Rebuild When executing rebuild, the Fast Rebuild feature skips any partition of the virtual disk where no write changes have occurred, it will focus only on the parts that have changed. This mechanism may reduce the amount of time needed for the rebuild task. It also reduces the risk of RAID failure cause of reducing the time required for the RAID status from degraded mode to healthy. At the same time, it frees up CPU resources more quickly to be available for other I/O and demands. Solution Without the Fast Rebuild feature [rebuild will start from the beginning partition to the end. It may spend lots of time to complete the task. When enabling Fast Rebuild feature, it will rebuild the partition with the changes only. Failed Disk Dirty Partition Clean Partition Rebuild Partition Virtual Disk Disable Fast Rebuild Enable Fast Rebuild TIP: With less changed partition, the Fast Rebuild feature may go faster. If the virtual disk is full of changed partition. The rebuild may take the same time without the Fast Rebuild feature. Copyright@2014 D-Link System, Inc. All Rights Reserved. 129

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D-Link Document – User Manual
Fast Rebuild
When executing rebuild, the Fast Rebuild feature skips any partition of the virtual disk where no
write changes have occurred, it will focus only on the parts that have changed. This mechanism
may reduce the amount of time needed for the rebuild task. It also reduces the risk of RAID failure
cause of reducing the time required for the RAID status from degraded mode to healthy. At the
same time, it frees up CPU resources more quickly to be available for other I/O and demands.
Solution
Without the Fast Rebuild feature [rebuild will start from the beginning partition to the end. It may
spend lots of time to complete the task. When enabling Fast Rebuild feature, it will rebuild the
partition with the changes only.
TIP:
With less changed partition, the Fast Rebuild feature may go faster. If the
virtual disk is full of changed partition. The rebuild may take the same time
without the Fast Rebuild feature.
Virtual Disk
Dirty Partition
Clean Partition
Rebuild Partition
Disable
Fast Rebuild
Enable
Fast Rebuild
Failed Disk
129
Copyright@2014 D-Link System, Inc. All Rights Reserved.