# mkfs -t ext4 /dev/sdd1 mke2fs 1.42.8 (20-Jun-2013) /dev/sdd1 is apparently in use by the system; will not make a filesystem here!
This is a new disk to the new server. It is not mounted.
What’s wrong here? How to fix it?
This is possibly caused by a RAID signature on the disk showing that the disk belongs to a RAID.
This issue can also be caused by multipath, if it is installed and in use. The device will need to included in multipath’s blacklist. (tip from Marcus White)