qemu ( qcow2 ) discard in lvm ( reverting Thin lvm )

My question is, with the old behaviuor for storages ( Proxmox 4.2 ) i can use the option Discard for the virtual hard disk ( with qemu qcow2 and lvm ) ?
You can always use discard.
If the storage does not support it, discard will be ignored.
thanks! ;)
i'm testing this setup, is working fine,

but today i got this error, while i was doing a backup by nfs ( i was deleting big files ( TB ) in the nfs at same time too, for to do a test.
on the virtual machine :
kernel: JBD2: Detected IO errors while flushing file data on dm-2-8

I did fsck but my file system is ok ( clean ).

i checked the smart an the hds are ok.


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