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I want to love Mainframes that much, but I frigging hate the way enthusiasts are treated by IBM. As such, and a direct consequence of it, I will never advise m
by unixhero 7y ago
I want to love Mainframes that much, but I frigging hate the way enthusiasts are treated by IBM.
As such, and a direct consequence of it, I will never advise my clients to go for anything IBM.
- rbanffy 7y agoAt least you can run Linux on an LPAR (and these machines are ridiculously fast Linux boxes). I wonder how a couple racks of z15 systems would compare to performance-equivalent racks of commodity x86 servers. I suspect that, per watt and area, these machines can host a lot more VMs than commodity racks.
- unixhero 7y agoOne commercial said it could host 9000 docker containers per lpar. Sounds tempting of course. But nah. I am not touching it, until IBM gets their ducks in a row.
- rbanffy 7y agoYou can run z/VM under the LPAR and host multiple Linux images under it, or host Linux directly on the LPAR and use KVM to split it into smaller VMs. The penalty for CPU oversubscription seems relatively small with the almost a gigabyte of L4 cache in every processor drawer. I'm not buying one (sadly it's a bit over my impulse buy threshold), but I'd love to play with one.
- ASalazarMX 7y agoThe maintenance costs are scary, though. X86 servers are practically a commodity.