Hi Eric,
Try updating the switch fw:
Please upgrade the firmware to the latest one (7.4.2070) by using the following steps:
1. Download the latest firmware zip file from Mellanox website, and copy it to one of the nodes in the fabric:
http://www.mellanox.com/downloads/firmware/fw-IS4-rel-7_4_3000-MIS5023Q_A1-A5.bin.zip
2. Unzip the file: unzip fw-IS4-rel-7_4_3000-MIS5023Q_A1-A5.bin.zip
3. In order to burn the new firmware version, invoke:
flint -d lid-<switch LID> -i fw-IS4-rel-7_4_3000-MIS5023Q_A1-A5.bin b
for example:
flint -d lid-10 -i fw-IS4-rel-7_4_3000-MIS5023Q_A1-A5.bin b
Where the switch LID can be retrieved from the ibnetdiscover or ibswitches commands
4. Reset the switch by Invoking :
flint -d lid-<switch LID> swreset