Women and Technology: sjroscal

To use tape device like robot and drives on logical domain, IO domain with split-pcie bus is required. There isn't virtual pci device until LDom manager 1.2 yet, and don't know it will be configured or not in next, next release.
I would like to check that tape device could run on IO domain of T5240 successfully. T5240 have 2 pcie bus, it means 1 control domain and 1 io domain can be configured at the same time, of course, a san disk as boot disk of io domain and additional network card for control domain are necessary. Tape device runs well on io domain as we expected.

See the short configuration for ldom,

Now, let's check how the number of split-pcie bus changes according to the number of cpus. The number of PCIe buses is equal to the number of CPUSs by system design and it's because the pcie root complex is the part of the cpu silicon.

As a result, max 4 split-pcie bus could be enabled with 4 cpus that is full T5440 configuration, however, what will be happened if only 2cpus are there? We can use only 2 split-pcie bus, of course, all pcie slot are still available after io reconfiguration to reattach each failed pcie slot and onboard device to its nearest available cpu module. (set ioreconfigure=nextboot)