EMC Storage Product Knowledge Sharing

What are the CLARiiON SAN fan-in and fan-out configuration rules?"Fan-In Rule: A server can be zoned to a maximum of four storage systems. Fan-Out Rule: For FC5300 with Access Logix software - 1 - 4 servers (eight initiators) to 1 storage system. For FC4500 with Access Logix - 15 servers to 1 storage system; each server with a maximum of one (single) path to an SP. For FC4700 with Base or Access Logix software 8.42.xx or higher - 32 initiators per SP port for a maximum of 128 initiators per FC4700....

What are the differences between failover modes on a CLARiiON array?A CLARiiON array is an Active/Passive device and uses a LUN ownership model. In other words, when a LUN is bound it has a default owner, either SP-A or SP-B. I/O requests traveling to a port SP-A can only reach LUNs owned by SP-A and I/O requests traveling to a port on SP-B can only reach LUNs owned SP-B. It is necessary to have different failover methods because in certain situations a host will need to access a LUN on the non-owning SP.The following failover...