Thanks for the comprehensive replies!

I'll need some baby speak on this one though: 

> The recommended use of whole disks is for drives with volatile write caches 
> where ZFS will enable the cache if it owns the whole disk. There may be an 
> RFE lurking here, but it might be tricky to correctly implement to protect 
> against future data corruptions by non-ZFS use.

I don't know what you mean by "drives with volatile write caches", but I'm 
dealing with commodity SATA2 drives from WD/Seagate/Hitachi/Samsung.  

This disk replacement thing is a pretty common use case, so I think it would be 
smart to sort it out while someone cares, and then stick the authoritative 
answer into the zfs wiki.  This is what I can contribute without knowing the 
answer:

The best way to incorporate abnormal disk size variance tolerance into a raidz 
array is BLANK, and it has these BLANK side effects.  

Now you guys fill in the BLANKs :P
 
 
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