I have rhel 6.4 on UCS Hardware c220M3 server. there were few Luns and tape drives we were using.
Then we have upgraded UCS firmware of the server its wrking fine but after few days we did kernel and os upgrade from RHEL 6.4 to RHEL 6.6 and now we are not able to see any Luns or tape on the server. even we checked dmesg no attached disk anywhere.
Please help what could be the issue.