We are in dire need of more storage, but don't have the funds.
What we do have is many older servers sitting around not being used.
Can we cluster those servers and have them act as a SAN?
I see iSCSI and stuff, but I'm not sure if that is what we want or can do. Does SLES11 or OES 2 have that capability? or is there other software to use?

Any suggestions would be of great help.