Users Guide

3wayVD2 HDD tier was 25 TiB, which uses 75 TiB of the HDD tier because of the 66 percent resiliency
overhead from Three-way mirroring. The SSD tier was 1 TiB, which uses 3 TiB of SSD tier because of
resiliency overhead.
After both VDs are created, there is 17.72 TiB of disk space remaining in the HDD tier (10.2 percent disk
space free) and 0.93 TiB of disk space remaining in the SSD tier (10.6 percent disk space free).
Table 8. Example of disk space values to be used for Storage tiers for pools and VDs
Pool Name tierPool1
HDDs in pool
48
HDD disk space
4 TB (3.64 TiB)
HDD tier disk space (after 10 percent for automatic
rebuild)
157.2 TiB
SSDs in pool
12
SSD disk space
800 GB (745 GiB)
SSD tier disk space (after 10 percent for automatic
rebuild)
7.86 Tib
VD name 2wayVD1
Resiliency
Two-way mirror
HDD tier disk space
41 TiB
SSD tier disk space
2.4 TiB
VD name 3wayVD2
Resiliency
Three-way mirror
HDD tier disk space
25 TiB
SSD tier disk space
1 TiB
Run the following PowerShell commands when creating a new SSD and HDD storage tier (configured for
each pool).
New-StorageTier -StoragePoolFriendlyName <poolName> -FriendlyName <ssdTierName>
-MediaType SSD
New-StorageTier -StoragePoolFriendlyName <poolName> -FriendlyName <hddTierName>
-MediaType HDD
For example,
New-StorageTier -StoragePoolFriendlyName “tierPool1” -FriendlyName
“tierPool1_SSD” –MediaType SSD
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