Bad disk on raid 1 setup

Brief description of the problem

I have a raid 1 pair of disks (6TB each). The pool is unmounted (one of the disks is “unknown”).
So it looks like a disk failure. I got the error after I booted the system (after being shut for two-weeks).
You can that I’m using openSUSE Leap Linux: 5.14.21-150400.24.100-default.

I tried btrfs check; yeah, there are errors (want more detailed results?)
What’s next? Buy a new disk and replace the bad one?

Detailed step by step instructions to reproduce the problem

Web-UI screenshot

Error Traceback provided on the Web-UI

Traceback (most recent call last): File "/opt/rockstor/src/rockstor/rest_framework_custom/generic_view.py", line 41, in _handle_exception yield File "/opt/rockstor/src/rockstor/storageadmin/views/pool_scrub.py", line 49, in get_queryset self._scrub_status(pool) File "/opt/rockstor/.venv/lib/python2.7/site-packages/django/utils/decorators.py", line 185, in inner return func(*args, **kwargs) File "/opt/rockstor/src/rockstor/storageadmin/views/pool_scrub.py", line 59, in _scrub_status cur_status = scrub_status(pool, btrfsprogs_legacy()) File "/opt/rockstor/src/rockstor/fs/btrfs.py", line 1936, in scrub_status mnt_pt = mount_root(pool) File "/opt/rockstor/src/rockstor/fs/btrfs.py", line 761, in mount_root run_command(mnt_cmd) File "/opt/rockstor/src/rockstor/system/osi.py", line 246, in run_command raise CommandException(cmd, out, err, rc) CommandException: Error running a command. cmd = /usr/bin/mount /dev/disk/by-label/media /mnt2/media -o ,compress=no. rc = 32. stdout = ['']. stderr = ['mount: /mnt2/media: wrong fs type, bad option, bad superblock on /dev/sdb, missing codepage or helper program, or other error.', '']