Martin wrote:
I agree for non enterprise users the expansion of
raidz vdevs is a critical missing feature.
Now you've got me curious. I'm not trying to be inflammatory here, but how is
online expansion a non-enterprise feature? From my perspective, enterprise
users are the ones most likely to keep legacy filesystems for extended lengths
of time, well past any rational usage plan. Enterprise users are also the ones
most likely to need 24/7 availability. Any hacker-in-a-basement can take a
storage pool offline to expand or contract it, while enterprise users lack this
luxury.
Experience taught me that enterprise users most need future flexibility and
zero downtime.
Again, I'm not arguing here, only interested in your contrasting viewpoint.
I think the original poster, was thinking that non-enterprise users
would be most interested in only having to *purchase* one drive at a time.
Enterprise users aren't likely to balk at purchasing 6-10 drives at a
time, so for them adding an additional *new* RaidZ to stripe across is
easier.
Remember though that it's been mathematically figured that the
disadvantages to RaidZ start to show up after 9 or 10 drives. (That's
been posted in this list earlier. I don't know that they're great
disadvantages - and probably even less to non-enterprise users, so I
think this would be useful.) So Most enterprise users are going to go
the 'new raidz' route.
-Kyle
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