NetApp Deduplication for FAS and V-Series Deployment and Implementation Guide
Configuration D: LUN Configuration for Maximum Volume Space Savings
If the user wants to apply the freed blocks to the volume free pool, this can be accomplished with the
following configuration:
1. LUN space reservation value = off
2. Volume rractional reserve value = any value from 0–100
3. Volume guarantee = volume
4. Snap reserve = 0%
5. Autodelete = off
6. Autosize = off
7. Try_first = volume_grow
Description: The difference between this configuration and configuration C is that the LUN is not space
reserved. With LUN space guarantees off, the value for volume fractional reserve is ignored for all LUNs in
this volume. From a deduplication perspective, there is no difference between this and the previous
configuration, and all freed blocks go to the volume free pool.
Pros and cons: From a deduplication perspective, this configuration has same advantages and
disadvantages as configuration C.
Configuration E: LUN Configuration for Maximum Aggregate Space Savings
In many cases, the user may prefer to reclaim all freed blocks from the volume and return these blocks to
the aggregate free pool. This is accomplished with the following configuration:
LUN space reservation value = off
Volume fractional reserve value = any value from 0–100
Volume guarantee = none
Snap reserve = 0%
Autodelete = on
Autosize = on
Try_first = volume_grow
Description: This configuration "forces" the free blocks out of the volume and into the aggregate free pool,
where the blocks can be reprovisioned for any other volumes in the aggregate.
Pros and cons: The advantage of this configuration is that it provides the highest efficiency in aggregate
space provisioning. It also uses the thin provisioning features of Data ONTAP, volume autosize and
Snapshot autodelete, to help administer the space in the solution.
The disadvantage of this configuration is that it requires the storage administrator to monitor the free space
available in the aggregates. With volume autosize and Snapshot autodelete turned on, the volume grows
first if space is available in the aggregate; if not, then Snapshot copies are deleted.
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