> 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 disks per server, I assume I
> cannot use ZRAID{,2} and still have the host be a CEPH OSD? (i.e. CEPH
> continues to require dedicated disks?)
For ZRAID2, you need at least 4 disks, plus another SSD for L2ARC ...
And yes, ceph needs decicated disks.
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