cloudstack disk device id & name

Hi all, I feel confused about /dev/sda , /dev/sdb/ , /dev/sda1, /dev/sda2 , or /dev/sda5. I know /dev/sda* is KVM boot partitions.So,how do they work? Besides,I have a volume whose device_id.to_i=1,so what's the device_name it equals to? /dev/sda or /dev/sdb? How does cloudstack calculate it? What

cloudstack disk device

Hi all, I feel confused about /dev/sda , /dev/sdb/ , /dev/sda1, /dev/sda2 , or /dev/sda5. I know /dev/sda* is KVM boot partitions.So,how do they work? Besides,I have a volume whose device_id.to_i=1,so what's the device_name it equals to? /dev/sda or /dev/sdb? How does cloudstack calculate it? What