Checking the Local Storage, Root, Swap status

Hi team,

i am new to proxmox , currently i am using proxmox 3.3 version. proxmox installed on /dev/sda (ssd-120gb) and it has 2nd disk /dev/sdb(hdd-1tb). i am using 2nd disk as lvm storage to store VM images. Now my queries are

1.How to check the storage status (free,usage) of ssd, is there any gui package/app to monitor status of PV,VG&LV . in cli with fdisk and display cmds we can n't see the free&usage space.

2. After installation of PMX on ssd it is split-ted into 3 partitions (root,swap,data) how to check the free and usage space of these 3 partitions. And what is the min. required or recommended space for root/swap. is there any guide line for root/swap?

3. Where to see the file system type / partition type of logical volumes? Both both SSD(pve) & HDD(lvm).

4. I got some 60gb of data partition from SSD to store images/files. i am installed a VM using 30gb of space but in gui it is using total-60gb,usage-10gb,free-50gb. And it is allowing me to create a VM with 200gb space how it is possible.
How to know the real space used by a VM while it is operational ?

I am getting little bit confusion on Root , Swap and SSD(local storage) utilization. In gui or CLI i am unable to understand total/usage/free space values. Please anyone can help me,

Thanks in advance.