LPAR is the ancient, and still somewhat superior[1] version of what we call a VM or docker container today. "Logical partition".
It's funny how much of what seems new isn't, really. Mainframes had VM's figured out decades ago, in a pretty elegant fashion.
IPL is basically "initial boot", SNA was a network transport. VTAM is to SNA the same as Ethernet is to IP (roughly, I'm skipping over LU6.2/APPC/etc).
You didn't ask about CICS, but it's basically cron+middleware but better.
In fact, if you look at, say AWS, and the set of standardized services, it isn't much different from what a mainframe offered so long ago. Standard, if somewhat limited, interfaces for scheduling, load balancing, VMs, databases, "nosql", events, logging/alerting, etc. Even nods to "microservices" and other things that feel new, but aren't really. Self service is a bit new, but the rest is well established.
[1] better I/O isolation, fewer "noisy neighbor" issues for example
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LPAR is the ancient, and still somewhat superior[1] version of what we call a VM or docker container today. "Logical partition".
It's funny how much of what seems new isn't, really. Mainframes had VM's figured out decades ago, in a pretty elegant fashion.
IPL is basically "initial boot", SNA was a network transport. VTAM is to SNA the same as Ethernet is to IP (roughly, I'm skipping over LU6.2/APPC/etc).
You didn't ask about CICS, but it's basically cron+middleware but better.
In fact, if you look at, say AWS, and the set of standardized services, it isn't much different from what a mainframe offered so long ago. Standard, if somewhat limited, interfaces for scheduling, load balancing, VMs, databases, "nosql", events, logging/alerting, etc. Even nods to "microservices" and other things that feel new, but aren't really. Self service is a bit new, but the rest is well established.
[1] better I/O isolation, fewer "noisy neighbor" issues for example