ReadyNAS 104 drive upgrade did not expand volume

mdstat.log for reference

Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md126 : active raid5 sda3[0] sdd3[5] sdc3[4] sdb3[1]
8776244352 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

md127 : active raid5 sdb4[0] sdc4[2] sda4[1]
1953245824 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU]

md1 : active raid10 sda2[0] sdd2[3] sdc2[2] sdb2[1]
1046528 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]

md0 : active raid1 sda1[0] sdd1[4] sdc1[5] sdb1[1]
4190208 blocks super 1.2 [4/4] [UUUU]

unused devices: <none>
/dev/md/0:
Version : 1.2
Creation Time : Sun Jun 5 07:39:27 2016
Raid Level : raid1
Array Size : 4190208 (4.00 GiB 4.29 GB)
Used Dev Size : 4190208 (4.00 GiB 4.29 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Mon Oct 2 11:16:52 2017
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Name : 2fe52592:0 (local to host 2fe52592)
UUID : 4caae69b:cacc40b8:4a7fd489:565c3485
Events : 22185
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
5 8 33 2 active sync /dev/sdc1
4 8 49 3 active sync /dev/sdd1
/dev/md/1:
Version : 1.2
Creation Time : Fri Sep 29 12:47:15 2017
Raid Level : raid10
Array Size : 1046528 (1022.00 MiB 1071.64 MB)
Used Dev Size : 523264 (511.00 MiB 535.82 MB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Sat Sep 30 19:47:47 2017
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 512K
Name : 2fe52592:1 (local to host 2fe52592)
UUID : d1326c53:d62b4a0b:8cf0c466:4c48e866
Events : 19
Number Major Minor RaidDevice State
0 8 2 0 active sync set-A /dev/sda2
1 8 18 1 active sync set-B /dev/sdb2
2 8 34 2 active sync set-A /dev/sdc2
3 8 50 3 active sync set-B /dev/sdd2
/dev/md/data-0:
Version : 1.2
Creation Time : Sun Jun 5 07:39:28 2016
Raid Level : raid5
Array Size : 8776244352 (8369.68 GiB 8986.87 GB)
Used Dev Size : 2925414784 (2789.89 GiB 2995.62 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Mon Oct 2 11:13:15 2017
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : 2fe52592:data-0 (local to host 2fe52592)
UUID : b381ff03:14024c0e:2aa4480f:2a32d549
Events : 2647
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3
4 8 35 2 active sync /dev/sdc3
5 8 51 3 active sync /dev/sdd3
/dev/md/data-1:
Version : 1.2
Creation Time : Sun Jun 5 07:42:20 2016
Raid Level : raid5
Array Size : 1953245824 (1862.76 GiB 2000.12 GB)
Used Dev Size : 976622912 (931.38 GiB 1000.06 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Mon Oct 2 11:13:16 2017
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : 2fe52592:data-1 (local to host 2fe52592)
UUID : 06d21306:1331bfc0:3c121f70:7580b7cc
Events : 3251
Number Major Minor RaidDevice State
0 8 20 0 active sync /dev/sdb4
1 8 4 1 active sync /dev/sda4
2 8 36 2 active sync /dev/sdc4