New attached SAN disks doesn't appears in device mapper multipath?

Issue

• 3 of newly attached disks are not multipathed. Can you provide documentation on how to add them to multipath configuration without incurring an outage?

/dev/sdc1 on /data1 type ext4 (rw,nodev)
/dev/sdd1 on /data2 type ext4 (rw,nodev)
/dev/sde1 on /data3 type ext4 (rw,nodev)

• Also, we don't want to affect the current disk that is already multipathed.