Administrator Guide

Expected Behaviors for Data Reduction Scenarios
The settings specied in both the storage container Data Reduction options and in the VMware Storage Prole determine the results
of VM and VVol creation. If the storage container Data Reduction settings conict with the settings in the VM Storage Prole,
creation of VMs and virtual volumes could fail.
The following table describes the expected behavior for new VM creation with the Compression option.
Table 4. Expected Behavior for New VM Creation with Compression
VM Storage Policy = None
Specied
VM Storage Policy =
Compression Enabled
VM Storage Policy =
Compression Disabled
Storage Container
Compression Enabled
Volumes created with Default
Data Reduction prole value
from storage container
Volumes created with
Compression Data Reduction
Prole
Volumes created with the Data
Reduction Prole set to None
Storage Container
Compression Disabled
Volumes created with Default
Data Reduction prole
value from storage container
VM creation fails because user
is trying to set an unsupported
capability
Volumes created with the Data
Reduction Prole set to None
The following table describes the expected behavior for new VM creation with the Deduplication option.
Table 5. Expected Behavior for New VM Creation with Deduplication
VM Storage Policy = None
Specied
VM Storage Policy =
Deduplication Enabled
VM Storage Policy =
Deduplication Disabled
Storage Container
Deduplication Enabled
Volumes created with Default
Data Reduction prole value
from storage container
Volumes created with Dedup
with Compression Data
Reduction Prole
Volumes created with the Data
Reduction Prole set to None
Storage Container
Deduplication Disabled
Volumes created with Default
Data Reduction prole
value from storage container
VM creation fails because user
is trying to set an unsupported
capability
Volumes created with the Data
Reduction Prole set to None
The following table describes the expected behavior for existing VMs when a vCenter user changes the associated VM policy. This
table assumes that both Compression and Deduplication are enabled on the storage container.
Table 6. Expected Behavior for VM Storage Policy Update on Existing VMs
Old VM Storage Policy New VM Storage Policy Expected Behavior
Compression Enabled Compression Disabled Data Reduction Prole of associated VVols changes from Compression to
None. Data is uncompressed at the next data progression cycle.
Compression Disabled/
None Specied
Compression Enabled Data Reduction Prole of associated VVols changes from None to
Compression. Data is compressed at the next data progression cycle.
Deduplication Disabled Deduplication Enabled Data Reduction Prole of associated VVols changes to Deduplication with
Compression. Data is deduplicated at the next data progression cycle.
Deduplication Enabled Deduplication Disabled Data Reduction Prole of associated VVols changes from Deduplication with
Compression to None. Data is rehydrated at the next data progression cycle.
The following table describes the expected behavior for existing VMs when a storage administrator selects or clears the
Compression and Deduplication checkboxes on a storage container.
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Managing Virtual Volumes With Storage Manager