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There is also no requirement for reserved space for snapshots in OneFS. Snapshots can use as much or little of the available file system space as desirable and necessary.
A snapshot reserve can be configured if preferred, although this will be an accounting reservation rather than a hard limit and is not a recommend best practice. If wanted, snapshot reserve can be set using the OneFS command-line interface (CLI) by running the ‘isi snapshot settings modify –reserve’ command.
For example, the following command will set the snapshot reserve to 20%:
# isi snapshot settings modify --reserve 20
Snapshot reserve does not limit the amount of space that snapshots can consume on the cluster. Snapshots can consume a greater percentage of storage capacity specified by the snapshot reserve.
Also, when using SmartPools, snapshots can be stored on a different disk tier than the one the original data resides on.