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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