A method, system and computer program product for data replication comprising receiving an IO at a first storage processor, sending metadata corresponding to the IO to a second SP, receiving an acknowledgement from the second SP indicating the second SP received the metadata and send the IO down an IO stack. A source or drain electrode of the signal transfer TFT 2 and the source or drain electrode of the reset TFT 3 are formed from a common electroconductive layer. The fixing bracket supports the column bracket via a support shaft.