Some questions:
1) if I have an HA cluster, does ZFS get me anything? Or is it really
only useful for standalone systems using local storage?
only useful for local storage
2) to get root-on-zfs, I assume I must reinstall instead of upgrading?
yes
3) since I use CEPH and only have 3 hard
Oh, I forgot the most important part!
It is much better to create pools referencing to disks by id, instead of their
names: it is hard to recover in any situation or just move from one server to
an other.
Like this:
zpool create -f -o ashift=12 rpool mirror
- it use gzip-6 compression by default - as the system supports lz4
compression, I recommend to use this one instead of gzip-X. In general. Of
course, it is possible to change the compression on the fly (for newly written
blocks) but for general usage, lz4 needs less power and provides a
