How to setup multipath

I am trying to use multipath for the first time. And even that I have read the documentation both here at Ubuntu and on Redhat, I'm not coming closer to a solution.

I have 4 disks

• /dev/sdb
• /dev/sdc
• /dev/sdd
• /dev/sde

What I'm trying to setup is this

mpatha    
    /dev/sdb
    /dev/sdc

mpathb
    /dev/sdb
    /dev/sdc

But for now I get this

sdb  259:0        0  1.1T  0 disk
ââmpatha 253:1    0  1.1T  0 mpath
sdc  259:1        0  1.1T  0 disk
ââmpathb 253:2    0  1.1T  0 mpath
sdd  259:2        0  1.1T  0 disk
ââmpathd 253:3    0  1.1T  0 mpath
sde  259:3        0  1.1T  0 disk

My config looks like this:

defaults {
    user_friendly_names     yes
    find_multipaths         no
    max_fds                 32
    uid_attribute           ID_WWN
    path_checker            directio
}

blacklist_exceptions {
  property "(ID_WWN|SCSI_IDENT_.*|ID_SERIAL|DEVTYPE)"
  devnode "sd*"

But how to specify which drives goes to which MultiPath groups?