What's the status of online capacity expansion for RAID-Z?
Hardware raid cards still have a leg up in this regard because it negates the
zfs's supposed scalability feature that SMBs are most interested in.
For example if you start off with 2 raidz2 vdevs of 5 1TB drives each. Then as
required they can be grown by adding additional drives to the same raidz2 vdevs
minimizing costs. Creating new raidz2 vdevs would carry an additional 100% cost
increase just to increase the pool size by 2TB.
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