Pro 6 running OS6: Array doesn't automatically expand

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fastfwd wrote:

I'm trying to expand one of my old 6-bay NAS boxes by replacing four of its drives with larger ones:

 

1. Started with a Pro 6 running OS 6.10.9, with six 4TB drives in XRAID RAID6 for a "16TB" (really 14.54TB) array.
2. Replaced one 4TB drive with an 8TB drive.  Waited for the resync to complete.
3. Repeated that replacement three more times, so I ended up with four 8TB drives and two 4TB drives.
4. I expected that the array would automatically resize to something near 24TB after the fourth drive had been replaced, but it didn't.
5. I restarted the NAS a couple of times, hoping that that would trigger an automatic resize, but it didn't.

 

Here's the current status.  As you can see, it's as though it still has six 4TB drives:

 

# btrfs filesystem show
Label: '33ea3f13:root' uuid: dad60fbb-7971-46be-8e32-f2063391a033
Total devices 1 FS bytes used 1.76GiB
devid 1 size 4.00GiB used 4.00GiB path /dev/md0

Label: '33ea3f13:data' uuid: 159d011a-173f-4597-b054-715f06650ab3
Total devices 1 FS bytes used 11.53TiB
devid 1 size 14.54TiB used 13.54TiB path /dev/mapper/data-0

# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md127 : active raid6 sda3[9] sdf3[8] sde3[7] sdd3[11] sdc3[6] sdb3[10]
15608675328 blocks super 1.2 level 6, 64k chunk, algorithm 2 [6/6] [UUUUUU]

md1 : active raid10 sde2[0] sdd2[5] sdc2[4] sdb2[3] sda2[2] sdf2[1]
1566720 blocks super 1.2 512K chunks 2 near-copies [6/6] [UUUUUU]

md0 : active raid1 sda1[9] sdf1[8] sde1[7] sdd1[11] sdc1[6] sdb1[10]
4190208 blocks super 1.2 [6/6] [UUUUUU]

unused devices: <none>

# mdadm --detail /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Tue Jan 3 20:54:48 2017
Raid Level : raid6
Array Size : 15608675328 (14885.59 GiB 15983.28 GB)
Used Dev Size : 3902168832 (3721.40 GiB 3995.82 GB)
Raid Devices : 6
Total Devices : 6
Persistence : Superblock is persistent

Update Time : Mon Oct 16 13:14:39 2023
State : clean
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 64K

Consistency Policy : unknown

Name : 33ea3f13:data-0 (local to host 33ea3f13)
UUID : 4d5f86c3:c41a1bc9:0efddce7:58f1c455
Events : 24063

Number Major Minor RaidDevice State
9 8 3 0 active sync /dev/sda3
10 8 19 1 active sync /dev/sdb3
6 8 35 2 active sync /dev/sdc3
11 8 51 3 active sync /dev/sdd3
7 8 67 4 active sync /dev/sde3
8 8 83 5 active sync /dev/sdf3

 

What's the best way to expand the array to its maximum size?

 

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If you haven't rebooted the NAS, then maybe try doing that. 

 

If that doesn't help, then look to see if there is fourth partition on all of the 8 TB drives (sdX4), and let us know if they are all there.