To display the compression ratio for the ZFS dataset /var/log on the pool

mypool, run the following command:

zfs get refcompressratio mypool/var/log

The refcompressratio will only display the compression ratio for that specific

dataset, not the descendant datasets. To include the child datasets, the

command looks like this:

zfs get compressratio mypool/var

-- Benedict Reuschling