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New bigger disk in ReadyNas Duo V2
Hi guys, I have the Duo V2 and it had 2 x 2TB WD red drives installed, it's in X-RAID2, the second drive failed so I bought a 4TB WD red drive, I swapped the 2nd drive with the new 4TB drive and the ...
Hi jasonbb,
X-RAID2 can only expand volumes when redundant space can be added. You will need to replace the other 2TB disk with a 4TB.
Regards,
The rule for volume size with XRAID2 is "sum the disks and subtract the largest".
In a 2-bay system, there will be wasted space if the drives aren't the same size. In systems with more bays, there will be wasted space if the two largest drives aren't the same size.
StephenB wrote:
The rule for volume size with XRAID2 is "sum the disks and subtract the smallest".
1x1TB + 1x4TB = 1TB RAID1
(1TB + 4TB) - 1TB = 4TB
7x1TB = 5TB RAID6
(1TB + 1TB + 1TB + 1TB + 1TB + 1TB + 1TB) - 1TB = 6TB
So this rule doesn't (always) apply, or did I get it wrong?
The problem is that it accounts for single redudancy space only, not for dual redundancy or unused capacity.
No, he just typed it too fast. You have to add them all and subtract the largest, not the smallest. This has the biggest impact on a 2 drive NAS, because the end result is "the size of the smallest".
Sandshark wrote:
add them all and subtract the largest
Ok :) that works... for single redundancy. If RAID6, then it's different rule, but single redundancy covers MOST cases.
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