Matthew Ahrens wrote:
Here is a proposal for a new 'copies' property which would allow
different levels of replication for different filesystems.
Thanks everyone for your input.
The problem that this feature attempts to address is when you have some
data that is more important (and thus needs a higher level of
redundancy) than other data. Of course in some situations you can use
multiple pools, but that is antithetical to ZFS's pooled storage model.
(You have to divide up your storage, you'll end up with stranded
storage and bandwidth, etc.)
Given the overwhelming criticism of this feature, I'm going to shelve it
for now.
Out of curiosity, what would you guys think about addressing this same
problem by having the option to store some filesystems unreplicated on
an mirrored (or raid-z) pool? This would have the same issues of
unexpected space usage, but since it would be *less* than expected, that
might be more acceptable. There are no plans to implement anything like
this right now, but I just wanted to get a read on it.
--matt
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