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ZFS Update
work in progress..
Newer versions of ZFS introduce bug fixes, support for newer kernels, and in some instances, introduce new storage pool features.
Portage will update these packages in the normal fashion through emerge --update @world. Special attention should be given when updating ZFS with Funtoo Linux installed onto ZFS: i.e. root (/) resides in a storage pool. Important additional steps are often required for Funtoo Linux installed on a ZFS storage pool.
* The ZFS ebuilds are sys-fs/zfs, sys-fs/zfs-kmod and sys-kernel/spl.
As best practice, it is strongly recommended that all users backup their data on a regular basis - irrespective of the file system being used. This could be particularly important should something go wrong while modifying or updating a live file system.
Funtoo installed on ZFS
After updating ZFS packages the initramfs responsible for importing and mounting root (/) should also be updated prior to rebooting. By having an initramfs with the same ZFS executables (zpool, zfs) as found in /sbin will reduce the likelihood of boot failure.
Do note that updating initramfs may also require the updating of bootloader or UEFI configuration as well.
...with GRUB
For typical installations, GRUB can support /boot residing within a ZFS storage pool (together with root /). There is an official installation guide for this configuration: ZFS Install Guide.
Updating from old versions of ZFS (0.6.3 or older) introduces new storage pool features. Older versions of GRUB do not support /boot inside of a ZFS storage pool with these latest features enabled. To reduce the likelihood of boot failure, GRUB should also be updated in addition to initramfs. As mentioned earlier, these steps should occur before rebooting or enabling new storage pool features.
After updating ZFS pages a review of the pool status will indicate if new features are available.
root # zpool status pool: rpool state: ONLINE status: Some supported features are not enabled on the pool. The pool can still be used, but some features are unavailable. action: Enable all features using 'zpool upgrade'. Once this is done, the pool may no longer be accessible by software that does not support the features. See zpool-features(5) for details. scan: none requested config: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0 0 ata-Samsung_SSD_840_EVO_120GB_123456789ABCDEF ONLINE 0 0 0 errors: No known data errors
Instructions:
To reduce the likelihood of your system from to boot with this new ZFS:
- For now, ignore the option to upgrade the storage pool
rpool. - Update your initramfs to include the latest ZFS binary executables.
- Ensure and if possible upgrade No results to the latest version. Follow Install for instructions on how to install GRUB. This includes repeating the steps involving
grub-install. - Confirm that your system reboots successfully. (Mounting the root pool)
Updating (root) Storage Pool Features
root # zpool upgrade This system supports ZFS pool feature flags. All pools are formatted using feature flags. Some supported features are not enabled on the following pools. Once a feature is enabled the pool may become incompatible with software that does not support the feature. See zpool-features(5) for details. POOL FEATURE --------------- rpool async_destroy empty_bpobj lz4_compress spacemap_histogram enabled_txg hole_birth extensible_dataset embedded_data bookmarks filesystem_limits large_blocks
root # zpool upgrade rpool This system supports ZFS pool feature flags. Enabled the following features on 'rpool': async_destroy empty_bpobj lz4_compress spacemap_histogram enabled_txg hole_birth extensible_dataset embedded_data bookmarks filesystem_limits large_blocks
root # zpool status pool: rpool state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0 0 ata-Samsung_SSD_840_EVO_120GB_123456789ABCDEF ONLINE 0 0 0 errors: No known data errors