My 2c is that if you wish to continue to use UFS in the absence of ZFS on more than one disk you need a volume manager so you need md or if you just need a volume manager you need md. There are several corner cases where this is possible, the that first spring to mind are:
- cluster - samfs/qfs - porting from existing md based systems (illumos ease of adoption). - memory constrained platforms. To quote from the freeBSD ZFS page " "To use ZFS, at least *1GB* of memory is recommended (for all architectures) but more is helpful as ZFS needs *lots* of memory. Depending on your workload, it may be possible to use ZFS on systems with less memory, but it requires careful tuning to avoid panics from memory exhaustion in the kernel. " -- Dominic Kay +44 780 124 6099
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