1.2 KiB
Update protocol
ZFS opens up new methods to safely update the system. These methods are described in this section in combination with general practises to maintain ZFS filesystems.
Pre-update
To be able to rollback the system after a system update one may create a snapshot of the root filesystem.
# zfs snapshot tank/root/alpine@previous
Tip:
zfs destroy
can be used to remove snapshots andzfs list -t snapshot
can be used to list them.
Update
Perform a system update.
# apk upgrade
# reboot
If the system does not behave accordingly after reboot, one may rollback to the previous snapshot and further investigate from there.
# zfs rollback -r tank/root/alpine@previous
Post-update
To maintain the performance of the SSDs in the system, perform a trim on the zfs-pool.
# zpool trim --secure --wait tank
Some devices may not support the option
--secure
, remove it then, if necessary.
Thereafter, perform a scrub on the zfs-pool which checks and repairs the data in the pool.
# zpool scrub tank
This may take a while, the progress can be checked with:
# zpool status tank
A ZFS scrub only repairs if mirror or a zraid mode is used in the pool.