Hi All I'm trying to setup my LVM thin pool to support discards so that the pool can reclaim space even if the underlying device doesn't support trim. It is my understanding that all thin pools should support trim even if the underlying device doesn't. (please correct me if I'm wrong here) I have one centos server that does support trim and everything is working correctly but any new servers and thin pools throw the error below. # fstrim -v /mnt/data00 fstrim: /mnt/data00: the discard operation is not supported I can't find any differences in the LVM configuration between the two servers, they both have the lv discards set to passthough. Can anyone tell me if I'm missing something when creating the thin pool that would allow me to perform the fstrim. I'm using xfs on all of the lvs. Thanks, Tim