Consistent jbd2 activity on new hard drive

Hello together,
im new here and have a silly question about jbd2. I have added a new hard drive to my NAS, and jbd2 won´t stop reading on it permanently.

I have done a fsck, with no result but im getting messages from Monit which tell me "file system flags have changed to 0x1000". Well i have no idea why i get these messages.

Here are some config files that could be helpful.

FSTAB

UUID=ed3988bc-33a5-470f-9c1a-8f17b0f63e0e /media/ed3988bc-33a5-470f-9c1a-8f17b0f63e0e ext4 defaults,nofail,user_xattr,noexec,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,acl 0 2
UUID=621b30df-d148-482d-90ee-1f254bae4785 /media/621b30df-d148-482d-90ee-1f254bae4785 ext4 defaults,nofail,user_xattr,noexec,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,acl 0 2

lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 7,3T 0 disk 
└─sda1 8:1 0 7,3T 0 part /media/621b30df-d148-482d-90ee-1f254bae4785
sdb 8:16 0 7,3T 0 disk 
└─sdb1 8:17 0 7,3T 0 part /media/ed3988bc-33a5-470f-9c1a-8f17b0f63e0e

Everything else is basically default, just 3 disks in it, two of them are the same modell. One of them (with the jbd2 problem) is only used for manual backups i make with rsync. So the sda drive (which has the problems) should normally not be active in any way.

Greetings

Well the other one is just fine. Really bad for me because that means i would have to delete it put xfs on it and see if it´s better with it?

Ok thanks for that comment. I have settled over to XFS now, the backup will take forever, hopefully it is getting better after it.

Ok, so the backup is done now, and it seems to work quite good with XFS. Thanks for the tip.