The log shows that sending
hdr requests to
tgt failed, so there is a problem with the
tgtd service [tgtd iSCSI target daemon]. The
tgtd iSCSI target daemon means that tgtd is the background service of the iSCSI target, that is, the daemon. Execute the command systemctl status tgtd and find that the service is in the disabled state.
So start the service
systemctl start tgtd can solve the problem