We have Dell Poweredge Windows Server 2008 R2 servers. They are connected to a Brocade/Foundry switch. Attached to the same switch in the same VLAN/Subnet is a Dell Equallogic SAN array.
Every day at seemingly random times, for periods of a few hours, our servers can no longer ping the SAN which is on the same switch. However if I telnet to the switch I can ping the SAN. One might think the switch is blocking them, but yet the SAN volumes are up and data is being written to them, so I know the switch isn't blocking them. We've tried rebooting the SAN, upgrading to the latest firmware, etc. We haven't replaced all of the cables (which are a couple months old), nor have we changed all 4 ports the cables are plugged into. It just seems very unlikely that all 4 of cables or ports that happen to be for a single member would die. We are working with Dell from the SAN and server perspective, but I'm trying to think of anything on the switch that could be the cause. We cannot really reboot the switch as it serves up many other connections/devices besides this SAN.