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Traditional hardware RAID requires you to start over from scratch to expand an array. ZFS has some limited ability to expand an array, but there are still a lot
by wtallis 3y ago
Traditional hardware RAID requires you to start over from scratch to expand an array. ZFS has some limited ability to expand an array, but there are still a lot of scenarios where the recommended solution is to start over from scratch. BTRFS has full flexibility for online resizing of arrays and changing between RAID modes and rebalancing the array, but its parity RAID modes aren't really trustworthy enough yet for a backup provider to be relying on.
- SteveNuts 3y agoNot always true, Dell PERC allows online expansion (you can even change raid levels on the fly in certain circumstances) but the controller switches from buffering writes to write-through cache policy during the operation which further slows things down.