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Planning Ahead for Capacity Upgrade
Well, the ol' 4TB based volume in my 516 is down below 3TB free space. FWIW, this somehow got created as a RAID-5 under X-RAID2, but with 4TB disks it wasn't so bad. After some thought and looking at...
The volume will only expand when redundant space can be added. So if you have one 12TB disk after the RAID-6 volume is rebuilt you will still have dual-redundancy.
After you've created the RAID-6 volume you can re-enable X-RAID.
In fact depending what disks are installed, with a RAID-5 volume with three or more disks you could disable X-RAID and designate it so that when the next empty slot is filled it is used to add parity (i.e. convert to RAID-6). This conversion does take a long time though.
But why play block level RAID games any more? Time for ZFS or Btrfs to properly take over. ;) I haven't been closely following the progress on making Btrfs "raid" protection more solid. But I know ZFS is already there. Between the two, I think I prefer Btrfs'es approach because it makes changing protection levels a bit more fluid; as opposed to ZFS which does creare more rigid relationships beteeen physical devices.
As an update, we're over a day into adding a second parity to this array and it's not quite 10%. Looking very much like it's going to take two weeks! Crazy.
Not production ready yet. https://btrfs.wiki.kernel.org/index.php/RAID56
btaroli wrote:
I haven't been closely following the progress on making Btrfs "raid" protection more solid.
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