Whether or not you need replication software like Mimix is a different discussion. I have no experience in the SAN environment. I found the SAN setup too pricey for our environment. Since you are already spending the money on SAN you may find replication software too pricey as an add on, (and 'maybe' not needed).
I have some concerns with SAN vs Replication but I'm willing to admit that there's enough people doing it so that it must be addressed somehow.
1 - IBM i and application software keys. If I'm running on Power System A, and fail over to Power System B do I have to frantically have to reapply all my keys which are tied to the machine's model and serial number? With replication software the major application packages, such as Infor, will even tell you not to replicate file such-and-such as it has their key stored in it.
2 - How do I avoid downtime when doing an OS upgrade, or PTF apply?
3 - How do you swap out the SAN for a newer model and not have any downtime?
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