The same section from the same TR-3505 has the below details. Hope this helps:
The default configuration of a NetApp LUN follows. (The best practice for all NetApp LUNs is to turn the controller Snapshot copy off, delete all scheduled Snapshot copies, and set the snap reserve to 0.)
1. LUN space reservation value = on Default = on
2. Volume fractional reserve value = 100 Default = 100%
3. Volume guarantee = volume Default = volume
4. Snap reserve = 0% Default = 20%
5. Autodelete = off Default = off
6. Autosize = off Default = off
7. Try_first = volume_grow Default = volume_grow
"When a LUN containing default values is deduplicated, no apparent savings are observed by the storage administrator because the LUN by default was space reserved when it was created and the fractional reserve was set to 100% in the volume. Any blocks freed through deduplication are allocated to the fractional reserve area. This configuration means that overwrite to the LUN should never fail, even if it is overwritten entirely."
1. LUN space reservation value = off
2. Volume fractional reserve value = any value from 0–100
3. Volume guarantee = none
4. Snap reserve = 0%
5. Autodelete = on
6. Autosize = on
7. Try_first = volume_grow
"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."
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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