setting zpool features
Before SUN was bought by Oracle, OpenSolaris had ever newer versions and upgrading was just an
$ zpool upgrade rpool
away. But since then, the open source version of ZFS gained feature flags.
POOL FEATURE
---------------
tank1
multi_vdev_crash_dump
enabled_txg
hole_birth
extensible_dataset
embedded_data
bookmarks
filesystem_limits
If you want to enable only one of these features, you may have already hit the
problem, that zpool upgrade
can only upgrade one pool or all.
The way to go is to use zpool set
. Feature flags are options on the pool and
can also be listed with zpool get
.
$ zpool get all tank1 | grep feature
tank1 feature@async_destroy enabled local
tank1 feature@empty_bpobj active local
tank1 feature@lz4_compress active local
tank1 feature@multi_vdev_crash_dump disabled local
...
Enabling a feature, for example _multi_vdev_crashdump, would then be
$ zpool set feature@multi_vdev_crash_dump=enabled tank1
It will then disappear from the zpool upgrade
output and be set to enabled
active in zpool get
.