You can see strange behaviour in the file system. eg.:
1. Login to the boot shell via IPMI or virtual console.
2. Get the device name of the core firmware, that will be used in step 5.
mount |awk '/\/mnt\/firmware\/mnt\/firmware/ { print $1 }'
3. Stop the core firmware:
systemctl stop boot-xcb
4. Only appliances with DRBD (output of step 2 is /dev/drbd0), set the DRBD device to 'primary':
drbdsetup /dev/drbd0 primary
5. Issue fsck, fsck.ext4 -f -v DEVICE_FROM_STEP_2
Apliances with DRBD
fsck.ext4 -f -v /dev/drbd0
Virtual appliances installed SSB 5 LTS or later
fsck.ext4 -f -v /dev/sda4
6. Exit from the boot shell and reboot the node:
Control -> Reboot
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