method of mapping LUNs
How to identify LUNs presented from storage devices (SAN or iSCSI)?
Let say I am building 2 nodes VCS cluster with fencing and several volumes. I use HA Storage Foundation suite.
I create necessary LUNs on storage servers and present them to both nodes.
Then I go to each node and see how those LUNs look like. Well, they all locally mapped as sdb, sdc, etc.
Only size of these LUNs roughly allows to tell which LUN is which and which storage server it came from.
In case of several differently sized LUNs it is probably easy, but what if I have many, many LUNs with identical sizes.
It can very much be possible that sdb on node 1 is not sdb on node 2.
So far, when I create LUNs myself I try to create them with slightly different sizes, so that only one device from one storage server available to pair it with identical in size device from another server.
Is there a methodology to identify each device surely?