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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.
So I've got the disks over in the other box now. And I've begun the process of adding a parity disk. Given the fullness of the volume, it suggests it will take 10 days! We shall see... but I have no reason to doubt it. heh
btaroli wrote:
So I've got the disks over in the other box now. And I've begun the process of adding a parity disk. Given the fullness of the volume, it suggests it will take 10 days! We shall see... but I have no reason to doubt it. heh
The resync time doesn't depend on the volume fullness. But of course it does take a while - every sector on every disk in the data volume needs to be either read or written at least once.
For other posters - OS-6 RAID doesn't actually use the "parity disk" idea. Parity and data blocks are evenly distributed across all the disks. That spreads the I/O across all drives, which has performance benefits.
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