Jan  6 00:04:09 ovn2 kernel: \[181703.837857\] device-mapper: table: 253:0: multipath: error getting device
Jan  6 00:04:09 ovn2 kernel: \[181703.838212\] device-mapper: ioctl: error adding target to table
Jan  6 00:04:09 ovn2 multipathd: dm-0: remove map (uevent)
Jan  6 00:04:09 ovn2 multipathd: dm-0: remove map (uevent)

ぐぬぬ

\[root@ovn2 multipath\]# multipath 
Jan 06 00:04:16 | ADATA\_SX300\_2D3920001647: ignoring map
\[root@ovn2 multipath\]# echo "blacklist {
>     wwid ADATA\_SX300\_2D3920001647
> }" >> /etc/multipath.conf
\[root@ovn2 multipath\]# service multipathd restart
Redirecting to /bin/systemctl restart  multipathd.service
\[root@ovn2 multipath\]# multipath
\[root@ovn2 multipath\]# 

すっきり！