Apologies if a duplicate somehow makes it through; I accidentally sent 
previously from my non-lists account (which is not subscribed).

Back before you got much of an install-time layout choice on the zpool, I set 
up some 1u machines with raidz2 on a 4 x LFF disk array by going behind 
SmartOS' back and creating the pool, then zfs send | zfs recv for the entire 
old zones pool.

Machines I set up this way have been working fine for years, with 
acceptable-to-us performance (yes, obviously it could always be better).  We 
like raidz2 because of the location of these machines and our travel schedules 
- if a disk croaks it might be a week or two until it's possible to replace and 
resilver.

Here in the future with specifyable raidz type on install, SmartOS says "no 
acceptable raidz2 layout" when I try to set up that complement of disks.

A trivial change at node_modules/disklayout.js line 325 would fix this problem 
by including 4 drives in the special case that already handles 5 and 6, but 
just making the change and issuing a pull request without explaining my 
situation and getting consensus that this is in fact a proper thing to do, 
seems unlikely to get the results I want.

Any thoughts on how we could accommodate setting up raidz2 on 4 drives as part 
of a normal install without screwing up other folks' workflow or other 
deleterious side effects?

Thanks,

-r




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