Discard unused space in thin provisioned environment

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Is there a simple way of discarding data when using  thin provisioning on storage ? I do not want to use discard option in fstab as it have impact on performace.

I have tried with fstrim but without success..

# fstrim -v /test
fstrim: /test: FITRIM ioctl failed: Operation not supported

Here is my setup:

3 luns of 1 TB and LVM and ext4 on top of them, (RHEL 6.3)

# df -h /test

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_ltest-lv_test
                      3.0T  200M  2.9T   1% /test

Storage (FC connected HDS) shows me it's full (3x 1TB/1TB)

Some additional data:

# grep . /sys/block/sd{c,d,e}/queue/discard_max_bytes
/sys/block/sdc/queue/discard_max_bytes:0
/sys/block/sdd/queue/discard_max_bytes:0
/sys/block/sde/queue/discard_max_bytes:0
 

Is this LVM fault ? Or something else ?

Thx

SM

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