deciding UFS vs ZFS

Sam Fourman Jr. sfourman at
Sun Jul 13 19:45:05 UTC 2014

Sam Fourman Jr.
On Jul 13, 2014 2:03 PM, "Michael W. Lucas" <mwlucas at>
> Hi,
> We have two 'big' filesystems, UFS and ZFS. How do people decide when
> to use which? I'm trying to build a "decision matrix" of when to use
> each.
> My virtualization system runs KVM, so I use UFS on VMs. Restoring
> ZFS disk images via dd can be problematic.
> For larger boxes running on real iron, I use ZFS.
> But there's a whole range of conditions between these two. And the way
> to fill in the gray spaces is to ask.
> So, how do you decide to use which filesystem?
> ==ml

My decision tree is simple....
if system == virtual machine use UFS

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