Cannot add new disk to RAID 6 - "Device or resource busy"

Zitat von Darkenor

I am trying to add a new disk to my (quite large) raid 6 array. I currently have nine devices. Here is the output of

mdadm --details /dev/md127:

/dev/md127:
Version : 1.2
Creation Time : Sat Mar 11 00:55:20 2017
Raid Level : raid6
Array Size : 54697266176 (52163.38 GiB 56010.00 GB)
Used Dev Size : 7813895168 (7451.91 GiB 8001.43 GB)
Raid Devices : 9
Total Devices : 9
Persistence : Superblock is persistent

Intent Bitmap : Internal

Update Time : Mon Feb 19 15:18:01 2018
State : active
Active Devices : 9
Working Devices : 9
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 512K

Name : mediavault:Storage
UUID : b38ef62a:26310dcf:9d362556:8d70b5f6
Events : 1625234

Number Major Minor RaidDevice State
9 8 96 0 active sync /dev/sdg
1 8 64 1 active sync /dev/sde
2 8 112 2 active sync /dev/sdh
10 8 80 3 active sync /dev/sdf
4 8 160 4 active sync /dev/sdk
5 8 128 5 active sync /dev/sdi
6 8 32 6 active sync /dev/sdc
7 8 48 7 active sync /dev/sdd
8 8 144 8 active sync /dev/sdj

The device I want to add is /dev/sdb. I try to do it via:

mdadm --add /dev/md127 /dev/sdb

mdadm: Cannot open /dev/sdb: Device or resource busy

I checked to see if it was mounted somewhere:

lsblk /dev/sdb
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdb 8:16 0 7.3T 0 disk

And apparently nothing.

In the GUI:

It shows up in physical disks. It does not show up in my raid. I can't see it when I select "grow" in the array.

Any suggestions on what I can do?

Other things I've tried:

mdadm --zero-superblock /dev/sdb
mdadm: Couldn't open /dev/sdb for write - not zeroing

Alles anzeigen

Did you try to wipe the new disk to confirm nothing is on it?

Sent from my Pixel XL using Tapatalk

Im having the same issue. I have 2*4tb drives and when i try to put them into RAID it reads "device or resource busy". I have tried ever trick in the book. Quick wiping, Secure wiping, Formating from a different machine, Turning it on and off again... etc. Nothing seems to do the trick.

I am not able to stop the RAID because I do not have one crated.

Edit: The issue was I has 2 hard drives plunged into my R-Pi 3B+ and it wasn't able to give out enough power. Easy fix was to get an external powered USB hub.