Users Guide

Table 4. Pool fault-tolerance and efficiency
Resiliency type Disk space efficiency Fault-tolerance
for each storage
pool
Example
enclosures with
60 x 4 TB HDD
(3.64 TiB)
Simple
100% 0 Disks
218.4 TiB raw disk
space
218.4 TiB usable
disk space
Two-way mirror
50% 1 Disk
218.4 TiB raw disk
space
109.2 TiB usable
disk space
Three-way
mirror
33% 2 Disks
218.4 TiB raw disk
space
72.07 TiB usable
disk space
Parity
1 Disk
Example with
column count of 7:
218.4 TiB raw disk
space
187.2 TiB usable
disk space
Dual parity
2 Disks
Example with
column count of 7:
218.4 TiB raw disk
space
124.8 TiB usable
disk space
NOTE: Creating VDs with thin provisioning is not supported.
Fixed provisioning allows usage of storage tiers and failover clustering, neither of which are supported
with thin provisioning.
Storage Space size is based on the number of disks and pools you have. You must spread the VDs evenly
across all pools, and assign them evenly to the storage nodes in the cluster to allow for load balancing
and resiliency.
You can run the New-VirtualDisk Powershell command for more advanced VD creation options.
For example,
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