Linux server does not see SAN LUNs when moved to new fibre switches.
Posted on 2014-03-11
We have a Linux server running Oracle Enterprise Linux 5.7 and it is running on a HP blade in a HP C7000 enclosure connected to fibre switch FSW01.
The Linux server is in a RAC cluster with another node. Everything work OK in this setup.
We need to move this server to another rack, into a brand new HP C7000 enclosure on a new fibre switch. The new fibre switch has been added to the existing fabric domain and the handful of Windows & VMware servers we have moved to the new rack all function well wrt SAN connections,
However, when we move the Linux server to the new rack/enclosure, although the EMC CX4-240 SAN shows the server as Logged in and Registered, Linux cannot see the LUNs presented to it.
We had to move the Linux server back to its original location to get it to see the LUNs again.
The old fabric switches are EMC DS5300Bs and the new ones in the new row are EMC DS6510Bs.
It seems obvious that the new fibre switch is causing the issue, but I cannot see it as being a zoning issue so what could be the problem here?