RAID1 name change after a simulated disk failure

Hi everybody,
I'm trying to test OMV in a Virtual Machine with a RAID1 configuration and simulate a drive failure to check the results.

1- I've three virtual hard disks:

/dev/sda (1GB)
	/dev/sdb (1GB)
	/dev/sdc (8GB) <-- OpenMediaVault is installed here.

2- I've created a RAID type 1 (Mirror) with harddisks: /dev/sda and /dev/sdb
the name of RAID is: OMV-NAS:RAID1
Part of the output of "cat /proc/mdstat" is

md0: active raid1 sdb[1] sda[0]
	1048564 blocks super 1.2 [2/2] [UU]

3- I've formated the file system with ext4 type and I mounted the file systems. Then, I shared some folders with NFS service to write some data without any problem.

4- To check the RAID system I've simulate a drive failure by software:

mdadm --manage --set-faulty /dev/md0 /dev/sdb

So /dev/sdb is the faulty disk

The system log report about the problem and the state of the RAID change from ACTIVE to CLEAN,DEGRADED

5-I shutdown the system and Add a new HardDisk /dev/sdd (2GB) to replace the faulty disk

6-I noticed that now the RAID has two NEW devices names as:

/dev/md127 clean,degraded   /dev/sdb
	/dev/md126 clean,degraded   /dev/sdc
And the ORIGINAL /dev/md0 has disappeared --> I don't know if this situation is correct.

In addition the device name on mounted filesystem has change to: /dev/md126
However if I type the mount command it report that the device mounted is /dev/md127

¿Is this a normal situation? or I'm missing something.

And if it is a normal situation, How can I recover the ARRAY? I've to click RECOVER button on the /dev/md126 device which is associate to hard drive /dev/sdc

Thank you,

PD: Sorry, but my English is not good enough.

No, I didn't remove /dev/sdb. I only attach the new hard disk to my virtual machine.

I'll try to remove de disk /dev/sdb .
Thanks.