--------------------------------------------
sda (1024G)
--------------------------------------------
/dev/sda1 / 100G
/dev/sda2 /boot 1G
/dev/sda3 /swap 2G
/dev/sda5 /home 50G
/dev/sda6 /opt 400G
/dev/sda7 /share 250G
/dev/sda8 a_user_1 100G
/dev/sda9 a_user_2 100G
--------------------------------------------
sdb (1024G)
--------------------------------------------
/dev/sdb1 100G b_user_1
/dev/sdb5 100G b_user_2
/dev/sdb6 200G b_user_3
/dev/sdb7 200G b_user_4
/dev/sdb8 400G b_data
--------------------------------------------
sdc (1024G)
--------------------------------------------
/dev/sdc1 100G c_user_1
/dev/sdc5 100G c_user_2
/dev/sdc6 200G c_user_3
/dev/sdc7 200G c_user_4
/dev/sdc8 400G c_data