how to get the really usage disk space of a lvm or ct

[huky]

the shared storage is vg1 from a fc san.

for example, I allocate 200G for a ct

PVE GUI summary show:
Bootdisk size 16.00% (157.34 GiB of 983.30GiB)

df inseide ct
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg1-vm--342--disk--0 984G 158G 776G 17% /
......


PVE node lvdispaly show
# lvdisplay vg_ccs/vm-342-disk-0
--- Logical volume ---
LV Path /dev/vg1/vm-342-disk-0
LV Name vm-342-disk-0
VG Name vg1
...
LV Status available
# open 1
LV Size 1000.00 GiB
......


so, the really allocated usage space on the vg1 is 1000G, 158G?

 

[oguz]

hi,

yes only 158G is allocated because of thin provisioning.

you can also check the output of lvs -a to see an overview

 

[huky]

thanks

hi,

yes only 158G is allocated because of thin provisioning.

you can also check the output of lvs -a to see an overview

but how PVE find the really size
Bootdisk size 16.00% (157.34 GiB of 983.30GiB)

I could not find used map:
# lvdisplay -a vg1/vm-342-disk-0
--- Logical volume ---
LV Path /dev/vg1/vm-342-disk-0
LV Name vm-342-disk-0
VG Name vg1
LV UUID jRFq82-Kac4-7pPQ-1fOZ-sFn7-lCsd-ULgdnz
LV Write Access read/write
LV Creation host, time ynode003, 2021-01-15 18:27:14 +0800
LV Status NOT available
LV Size 1000.00 GiB
Current LE 256000
Segments 2
Allocation inherit
Read ahead sectors auto

vdisplay -a vg1/vm-204-disk-2
--- Logical volume ---
LV Path /dev/vg1/vm-204-disk-2
LV Name vm-204-disk-2
VG Name vg1
LV UUID rO09Gh-dtpz-6GIk-DymC-Re7l-5rj9-C3M2Mj
LV Write Access read/write
LV Creation host, time ynode006, 2017-03-31 09:31:19 +0800
LV Status available
# open 0
LV Size 600.00 GiB
Current LE 153600
Segments 3
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:93

 

[oguz]

but how PVE find the really size

it's calculated from the used percentage and the total size.

you can calculate it too:

used_absolute = (used_percent * lv_size) / 100

so in your case:

used_absolute = ( 16 * 983G ) / 100 = 157G