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Issue adding drive 4 to ReadyNAS nv+ v2
All I recently setup my ReadyNAS NV+ v2 from scratch with 3 3 TB Hitachi DK7SAD300 drives. The steps I followed and an issue I encountered are described in Best way to swap drives ReadyNAS nv+ ...
I just found the original /var/log/frontview/raid_config_2026_01_31.log, this confirms the that volume md2 was originally setup with 3 drives/partitions.
What I also recall now is that the first time I added disk 4 afterwards, I did so after powering down the NAS (thinking that hot-add was not something that would be supported or would be a bad idea). Maybe this explains why the setup ended up where we are today?
***** RAID configuration log from 2026/01/31 *****
***** mdadm -D --scan -v *****
***** mdadm -D --scan -vv *****
***** mdconfig *****
Device : /dev/md0
Create Time : 1769872583
Update Time : 1769902702
RAID Level : 1
RAID Capacity : 4193268
Disk Size : 4193268
Chunk Size : 0
Disks : 3
RAID Disks : 3
Active Disks : 3
Working Disks : 3
Failed Disks : 0
Spare Disks : 0
State : 1 [ Clean ]
Disk Device RAID Disk Maj/Min Sectors State
---------------------------------------------------------------------------
0 /dev/sda1 0 8/ 1 8388608 6 [ Active Sync ]
1 /dev/sdb1 1 8/17 8388608 6 [ Active Sync ]
2 /dev/sdc1 2 8/33 8388608 6 [ Active Sync ]
Device : /dev/md1
Create Time : 1769872583
Update Time : 1769902459
RAID Level : 1
RAID Capacity : 524276
Disk Size : 524276
Chunk Size : 0
Disks : 3
RAID Disks : 3
Active Disks : 3
Working Disks : 3
Failed Disks : 0
Spare Disks : 0
State : 1 [ Clean ]
Disk Device RAID Disk Maj/Min Sectors State
---------------------------------------------------------------------------
0 /dev/sda2 0 8/ 2 1048576 6 [ Active Sync ]
1 /dev/sdb2 1 8/18 1048576 6 [ Active Sync ]
2 /dev/sdc2 2 8/34 1048576 6 [ Active Sync ]
Device : /dev/md2
Create Time : 1769872584
Update Time : 1769902675
RAID Level : 5
RAID Capacity : 0
Disk Size : 0
Chunk Size : 65536
Disks : 3
RAID Disks : 3
Active Disks : 2
Working Disks : 3
Failed Disks : 0
Spare Disks : 1
State : 1 [ Clean ]
Disk Device RAID Disk Maj/Min Sectors State
---------------------------------------------------------------------------
0 /dev/sda3 0 8/ 3 4294967295 6 [ Active Sync ]
1 /dev/sdb3 1 8/19 4294967295 6 [ Active Sync ]
2 /dev/sdc3 2 8/35 4294967295 0 [ Standby ]
What I also recall now is that the first time I added disk 4 afterwards, I did so after powering down the NAS (thinking that hot-add was not something that would be supported or would be a bad idea). Maybe this explains why the setup ended up where we are today?
That doesn't explain the problem, the expansion should have worked. The NAS is supposed to detect a new disk from a cold start, and even if that didn't work properly the NAS still should have formatted again and expanded when you hot-added it later.
Starting over with all disks in place might (hopefully will) work properly.
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