Expansion fails to utilize full disk size

[ON2014]

QNAP 212P, latest firmware (4.3.3.0868), RAID 1
I replaced two WD Red 2tb disks with WD Red 6tb disks. I replaced one HDD at a time, letting the array rebuild for each. Then I attempted to expand the capacity (storage manager, RAID management, expand capacity). The assumption was that when finished, the expanded volume would be somewhere near the full capacity of 5589.03 GB. However, after completion, the resultant volume size is 4031.73. Subsequent attempts to expand have not added any capacity and complete rather quickly compared to the several hours the original expansion took. At no point am I offered a choice of volume size or "max", the expand function just runs and returns the undesired (same) result.

What do I need to do to utilize the full disk space I paid for?

Thanks.

[dolbyman]

try the replace one by one process again (telling the nas you are replacing drives) and format the drives between swaps(so they appear new)

process is in the manual

[ON2014]

Since I have to shut down the NAS to swap drives, is it really necessary to involve RAID mgt. in the process?

[dolbyman]

I don't understand the question (I get that the 212P has not hotswap trays)

[ON2014]

You said to tell the NAS I'm swapping drives, presumably via the Volume/RAID management dialog. Is this a necessary step since installing a new drive automatically triggers the rebuild without any intervention on my part?

[dolbyman]

well ..you want to expand capacity .. not swap a faulty drive .. then follow the process on how to expand capacity

[jona]

I have a similar issue. I tried to upgrade my NAS (Qnap 219P+) from 2x3TB to 2x6TB and I'm stuck at 4031.73 GB.

"mdadm -D /dev/md0" is telling that I have version 00.90.03 and version 0.9 seems to support only 4TB.

Upgrading the 0.9 to 1.0 (and allows bigger partition) seems possible with mdadm > 3.3 but I only have mdadm - v2.6.3 (that's what "mdadm -V" is saying).

[dolbyman]

did you follow the process or just swap the drives?