D-Link DSN-656 User Manual - Page 130

Configuration, Constraint, SSD Caching (licensing fee required)

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D-Link Document - User Manual Configuration When creating a virtual disk, enable the Fast Rebuild. The default is disabled. Constraint Here are some constraints about Fast Rebuild.  Only thick/fat RAID group supports this feature. Thin provision RAID group already has this feature implemented.  When rebuilding happens to a fast rebuild virtual disk, clean partitions are not rebuilt since there is no data saved there. Though clean partitions are never rebuilt, their health status is good.  If all partitions of the fast rebuild virtual disk are clean, then no rebuild will happen and no event would be sent.  The RAID stacks could not use optimize algorithm to compute parities of a partition which is not rebuilt. Thus, the performance of random write in a clean partition would be worse. CAUTION: The fast rebuild should not be enabled for a virtual disk whose access pattern is random write. SSD Caching (licensing fee required) The traditional storage technology stored in the HDDs (Hard Disk Drives) and SSDs (Solid-State Drives) are mainly used in mission critical applications where the speed of the storage system Copyright@2014 D-Link System, Inc. All Rights Reserved. 130

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D-Link Document – User Manual
Configuration
When creating a virtual disk, enable the Fast Rebuild. The default is disabled.
Constraint
Here are some constraints about Fast Rebuild.
Only thick/fat RAID group supports this feature. Thin provision RAID group already has this
feature implemented.
When rebuilding happens to a fast rebuild virtual disk, clean partitions are not rebuilt since
there is no data saved there. Though clean partitions are never rebuilt, their health status is
good.
If all partitions of the fast rebuild virtual disk are clean, then no rebuild will happen and no
event would be sent.
The RAID stacks could not use optimize algorithm to compute parities of a partition which is
not rebuilt. Thus, the performance of random write in a clean partition would be worse.
CAUTION:
The fast rebuild should not be enabled for a virtual disk whose access pattern
is random write.
SSD Caching (licensing fee required)
The traditional storage technology stored in the HDDs (Hard Disk Drives) and SSDs (Solid-State
Drives) are mainly used in mission critical applications where the speed of the storage system
130
Copyright@2014 D-Link System, Inc. All Rights Reserved.