Michal Jaegermann wrote:
I wonder if anybody else have seen something like that.
...
# mke2fs -j /dev/sdb1 mke2fs 1.39 (29-May-2006) /dev/sdb1 is apparently in use by the system; will not make a filesystem here!
??? Neither fuser, nor lsof, nor searches for anything else reveal why /dev/sdb1 could be "in use". OK, lets try to force the issue
# mke2fs -F -j /dev/sdb1 mke2fs 1.39 (29-May-2006) /dev/sdb1 is apparently in use by the system; mke2fs forced anyway. /dev/sdb1: Device or resource busy while setting up superblock
take a look at https://www.redhat.com/archives/fedora-list/2006-September/msg02311.html
the last part !