trim or discard mapped size disk from within the host machine

[NabiKAZ]

About returning unused space (trim or discard mapped size disk)
I know about use `fstrim` command in guest vm.
But I can not login to the guest customers!
Now, my question is, is there any way to do this from within the host machine (main proxmox server)?

 

[loomes]

Try this one: https://forum.proxmox.com/threads/lxc-lvm-thin-discard-fstrim.34393/#post-168569

 

[NabiKAZ]

Try this one: https://forum.proxmox.com/threads/lxc-lvm-thin-discard-fstrim.34393/#post-168569

Thanks, But summarizes of that script is this command:

fstrim -v /

That is for guest machine, and does not works in the host machine.
In the host machine (proxmox server):

# fstrim -v /
fstrim: /: the discard operation is not supported

 

[spirit]

For vm, its posible with qrmy agent:: qm agent vmid fstrim

 

[NabiKAZ]

For vm, its posible with qrmy agent:: qm agent vmid fstrim

I try this but give me error:

# qm agent 104 fstrim
No Qemu Guest Agent

 

[NabiKAZ]

I should be enable "Qemu Agent" by this command:

root@pve:~# qm set 104 -agent 1
update VM 104: -agent 1

And then stop/start vm.
But when I try again get me another error:

root@pve:~# qm agent 104 fstrim
VM 104 qmp command 'guest-fstrim' failed - got timeout

 

[NabiKAZ]

Oops! Seem I just should be install "qemu-guest-agent" on guest.

# yum install qemu-guest-agent

Now works:

root@pve:~# qm agent 104 fstrim
{
   "paths" : [
      {
         "minimum" : 0,
         "path" : "/boot",
         "trimmed" : 951955456
      },
      {
         "minimum" : 0,
         "path" : "/",
         "trimmed" : 17067794432
      }
   ]
}

It's powerful ;-)

Thanks.