I want to use ZFS filesystem compression on a history database with read-only tablespaces.  What is the best way to get the datafiles compressed?

I have 5 history databases that total about 2.2 Terabytes. They use about 15 filesystems, but I can start with 2 that are isolated to only one database.  I have asked for ZFS compression to be set on the filesystems, but since these are read-only tablespaces, I do not think any compression will happen.  Can I simply offline, copy and rename the files from one filesystem to the other to make the compression happen?

just rsync the files to a compressed Zpool. do this using shadow migration, and you only loose access to the data for a few seconds.
1) make new dataset with compression
2) enable shadow migration between the new and old
3) change the database to use the new location
4) watch as data is automatically copied and compressed :-)
the the down side, you need extra space to pull the off.

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