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TrueNas/ZFS/ZFS Commands.md

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+# ZFS Commands
+Use sudo for all commands unless specifically stated.
+
+## Rename dataset
+`zfs [-f][-p][-u] rename oldname newname`  
+(Note: remember to use the full path i.e. tank/oldname etc.)  
+- `-f`  
+*to force unmount the dataset if needed (has no effect if used together with `-u`)*
+- `-p`  
+*Creates all the nonexistent parent datasets. Datasets created in this manner are automatically mounted according to the mountpoint property inherited from their parent.*
+- `-u`  
+*Do not remount file systems during rename. If a file system's mountpoint property is set to legacy or none, the file system is not unmounted even if this option is not given*
+
+`zfs -r rename snapshot snapshot`  
+- `-r`  
+*Recursively rename the snapshots of all descendent datasets. Snapshots are the only dataset that can be renamed recursively*
+
+## Get compression ratios
+`zfs get compressratio [dataset]`  
+*If no dataset given, the command with list out all datasets and their compressionratios. If dataset given, then only that dataset is returned.*