I am running Debian 8 on an Dell PowerEdge R420.

The OS is installed onto a INTEL SSDSC2BA800G3T SSD with firmware 5DV1DL03. The LVM is not configured, and the encryption is not enabled either. 

The SSD is connected to a PERC H310 Mini (MegaRAID SAS 2008), and is in passthrough mode (meaning no RAID whatsoever). The firmware version of the controller is 2.121.14-3811.

I have tried configuring TRIM on this machine, but when I am running fstrim, it is telling me that the operation is not supported:

# fstrim -v /

fstrim: /: the discard operation is not supported

The SSD supports TRIM:

# hdparm -I /dev/sda | grep TRIM
* Data Set Management TRIM supported (limit 6 blocks)
* Deterministic read ZEROs after TRIM

Can you tell me if this controller is able to pass-through the TRIM commands to the SSD? Are there any other additional settings that need to be set?