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Local, Near & Far Memory part 9 - Firmware Updates
The Hypervisor makes the virtual machine (LPAR) placement decisions and changes during DLPAR. The Hypervisor is part of the Power Systems Firmware. The POWER7 machines first arrived in the early months of 2010. Since then we have had a lot of field experience with the larger machines with large configurations with large applications and tens of thousands of processes running and in particularly the machines with all three layers of memory - which are the Power 770, Power 780 and Power 795. From this experience, the POWER developers have... [More]
Tags:  processor power7 cpu vm entitlement powervm virtual aix lpar placement |
Local, Near & Far Memory part 8 - Dynamic LPAR changes can mess up your placement
After you have started and used your virtual machine (VM) for a while, you may decide to change its size using a Dynamic LPAR (DLPAR) change from the HMC (or SDMC or IVM, of course). This has virtual machine placement implications. When shrinking your VM, the hypervisor will decide which CPU or memory (LBM) to release and it might not select what you think is the obvious choice. When enlarging your VM, we might thing there is an obvious way to grow in a balanced way but we can't see: 1) where physically our virtual machine is placed in the... [More]
Tags:  ram processor placement power6 power7 powervm dlpar lpar vm entitlement virtual lmb cpu aix |
Local, Near & Far Memory part 7 - VM placement also needs RAM
We all tend to concentrate on the CPU first and the memory second. CPUs, as the "brains" of the machine, does get a high focus and have a lot of extreme technology within it but the RAM is the "guts" of the machine to "feed" the CPU with nutrient data. OK, let us stop the analogy there :-) Along with reducing the number of CPUs via a lower virtual processor count, we also need to have the CPUs matching the memory - so AIX has a fighting change to localise a running process to its home SRAD and thus have it's data... [More]
Tags:  entitlement lpar ram power7 vm placement virtual aix power6 cpu processor powervm lmb |