How can I tell if my ReadyNAS Pro Pioneer vol is expanding?

I have a Pro Pioneer which had 6 disks in it. 4x1TB and 2x2TB.

Over the weekend I got an alert that disk 1 was starting to fail, so I ordered a replacement disk.
The failing disk is 1TB and the replacement is 3TB.
After initially putting in the 3TB disk it successfully rebuilt the volume, once I figured out that I had to reboot to get it to start resyncing.
I was now protected, so that all seemed to go well enough.

Then I was waiting for it to expand using the 2nd TB on the new disk to match up with the 2nd TB on disks 5 and 6.
It even said it would expand using that space, but wasn't doing anything.
At that point I figured I had to reboot once again to get that process to start, after which is appeared to say it was expanding.
I left it overnight and when I checked it today nothing seems to have happened. Any mention of expansion is gone and it's operating as-if I still had 4x1 and 2x2.

Here is the main log file, with some annotations:

Thu Oct 10 12:08:42 PDT 2013 System is up.
Thu Oct 10 12:07:34 PDT 2013 Rebooting device...
Thu Oct 10 12:07:34 PDT 2013 Please close this browser session and use RAIDar to reconnect to the device. System rebooting...

It appeared to start expanding, but when I checked again today nothing had happened and we were back at the previous capacity.

Wed Oct 9 20:44:37 PDT 2013 System is up.
Wed Oct 9 20:44:19 PDT 2013 Continuing with volume expansion or migration. Do not interrupt the system during this time. When complete, email notification will be sent to the alert contact list.
Wed Oct 9 20:43:20 PDT 2013 Rebooting device...

Nothing had happened saying it was expanding, so I asked it to reboot again.

Wed Oct 9 20:43:20 PDT 2013 Please close this browser session and use RAIDar to reconnect to the device. System rebooting...
Wed Oct 9 18:07:41 PDT 2013 RAID sync finished on volume C.
Wed Oct 9 13:30:19 PDT 2013 System is up.

Nothing was happening, and google (pointing me here) let me know I had to reboot to get it to rebuild.

Wed Oct 9 13:28:33 PDT 2013 Please close this browser session and use RAIDar to reconnect to the device. System rebooting...
Wed Oct 9 12:31:35 PDT 2013 Data volume will be rebuilt with disk 1.

The new disk arrived and I put it in place as disk 1.

Wed Oct 9 12:29:27 PDT 2013 New disk detected. If multiple disks have been added, they will be processed one at a time. Please do not remove any added disk(s) during this time. [Disk 1]
Tue Oct 8 13:34:42 PDT 2013 A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.

At this point I removed disk 1 to look at the serial number. I needed to see if it was still under warranty, which it is.

Tue Oct 8 13:34:42 PDT 2013 Disk removal detected. [Disk 1]
Tue Oct 8 04:00:35 PDT 2013 Reallocated sector count has increased in the last day. Disk 1: Previous count: 114 Current count: 115 ATA error count has increased in the last day. Disk 1: Previous count: 6 Current count: 260 Growing SMART errors indicate a disk that may fail soon. If the errors continue to increase, you should be prepared to replace the disk.
Tue Oct 8 02:40:05 PDT 2013 The on-line filesystem consistency check completed without errors for Volume C.
Tue Oct 8 00:00:10 PDT 2013 The on-line filesystem consistency check has started for Volume C.

At this point I ordered the new disk.

Mon Oct 7 15:27:39 PDT 2013 RAID sync finished on volume C. The array is still in degraded mode, however. This can be caused by a disk sync failure or failed disks in a multi-parity disk array.
Mon Oct 7 14:44:26 PDT 2013 System is up.
Mon Oct 7 14:44:11 PDT 2013 Reallocated sector count has increased in the last day. Disk 1: Previous count: 0 Current count: 114 ATA error count has increased in the last day. Disk 1: Previous count: 0 Current count: 6 Growing SMART errors indicate a disk that may fail soon. If the errors continue to increase, you should be prepared to replace the disk.

It appears to know about the extra disk space, but is not using it:
4657 GB (84%) of 5539 GB used
Configuration: RAID Level X-RAID2, 6 disks
Status: Redundant
RAID Disks:
Ch 1 : WDC WD30EFRX-68EUZN0 [2794 GB] 1858 GB allocated
Ch 2 : WDC WD1000FYPS-01ZKB1 [931 GB] 927 GB allocated
Ch 3 : WDC WD1000FYPS-01ZKB1 [931 GB] 927 GB allocated
Ch 4 : WDC WD1000FYPS-01ZKB1 [931 GB] 927 GB allocated
Ch 5 : WDC WD2003FYYS-02W0B0 [1863 GB] 1858 GB allocated
Ch 6 : WDC WD2003FYYS-02W0B0 [1863 GB] 1858 GB allocated

5539 is the same size as when I had 4x1 + 2x2. It makes sense for 927*5 + 931.
If it had expanded I would expect to see 927*5 + 2*931, or approximately 6497.

How do I get it to properly expand and use the extra space? Since I'm nearly full now and those 1TB drives are ~4.5 years old I decided to buy 3 more 3TB drives.
But I don't want to put them in until I've gotten disk1 to be properly used for that first expansion.