D-Link DSN-626 User Manual - Page 99

Scalable RAID group size, RAID sets.

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D-Link Document - User Manual Figure 2: Virtual disks are created. In Figure 3, the free space of "Fat-RG" immediately reduces to 862GB. 1000GB is taken away by the virtual disk. However, the free space of "Thin-RG" is still 1862GB even though the same sized virtual disk is created from the RAID group. Nothing is written to the virtual disk yet, so no space is allocated. The remaining 1862GB can be used to create other virtual disks. This is storage efficiency. Figure 3: Write on demand  Expand capacity on demand without downtime. Extra RAID set can be added to the thin RAID group to increase the size of free storage pool. A thin RAID group can have up to 32 RAID sets with each RAID set containing up to 64 physical hard drives. The maximum size of each RAID set is 64TB. Figure 4 shows that "Thin-RG" consists of two RAID sets. Figure 4: Scalable RAID group size  Allocation unit (granularity) is 1GB. This is a number that demands careful balance between efficiency and performance. The smaller it is, the better the efficiency and the worse the performance becomes, and vice versa.  Thin provisioned snapshot space and it is writeable. Copyright@2014 D-Link System, Inc. All Rights Reserved. 99

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D-Link Document – User Manual
Figure 2: Virtual disks are created.
In Figure 3, the free space of "Fat-RG" immediately reduces to 862GB. 1000GB is taken away by
the virtual disk. However, the free space of "Thin-RG" is still 1862GB even though the same sized
virtual disk is created from the RAID group. Nothing is written to the virtual disk yet, so no space is
allocated. The remaining 1862GB can be used to create other virtual disks. This is storage
efficiency.
Figure 3: Write on demand
Expand capacity on demand without downtime.
Extra RAID set can be added to the thin RAID group to increase the size of free storage pool. A thin
RAID group can have up to 32 RAID sets with each RAID set containing up to 64 physical hard
drives. The maximum size of each RAID set is 64TB. Figure 4 shows that "Thin-RG" consists of two
RAID sets.
Figure 4: Scalable RAID group size
Allocation unit (granularity) is 1GB. This is a number that demands careful balance between
efficiency and performance. The smaller it is, the better the efficiency and the worse the
performance becomes, and vice versa.
Thin provisioned snapshot space and it is writeable.
99
Copyright@2014 D-Link System, Inc. All Rights Reserved.