Friday, 19 April 2013

Virtualization Notes

PowerVM: It allows to increase the utilization of servers. Power VM includes Logical partitioning, Micro Partitioning, Systems Virtualization, VIO, hypervisor and so on.

Simultaneous Multi Threading : SMT is an IBM microprocessor technology that allows 2 separate H/W instruction streams to run concurrently on the same physical processor.

Virtual Ethernet : VLAN allows secure connection between logical partitions without the need for a physical IO adapter or cabling. The ability to securely share Ethernet bandwidth across multiple partitions increases H/W utilization.

Virtual SCSI: VSCSI provides secure communication between the partitions and VIO server.The combination of VSCSI and VIO capabilities allows you to share storage adapter bandwidth and to subdivide single large disks into smaller segments. The adapters and disks can shared across multiple partitions, increase utilization.

VIO server : Physical resources allows you to share the group of partitions.The VIO server can use both virtualized storage and network adapters, making use of VSCSI and virtual Ethernet.

Redundant VIO server: AIX or linux partitions can be a client of one or more VIO servers at the same time. A good strategy to improve availability for sets of client partitions is to connect them to 2 VIO servers. The reason for redundancy is ability to upgrade latest technologies without affecting production workloads.

Micro Partitioning: Sharing the processing capacity from one or more logical partitions. The benefit of Micro Partitioning is that it allows significantly increased overall utilization . n of processor resources. A micro partition must have 0.1 processing units. Maximum no.of partitions on any system P server is 254.

Uncapped Mode : The processing capacity can exceed the entitled capacity when resources are available in the shared processor pool and the micro partition is eligible to run.

Capped Mode : The processing capacity can never exceed the entitled capacity.

Virtual Processors :A virtual processor is a representation of a physical processor that is presented to the operating system running in a micro partition.

If a micro partition is having 1.60 processing units , and 2 virtual processors. Each virtual processor will have 0.80 processing units.

Dedicated processors : Dedicated processors are whole processors that are assigned to dedicated LPARs . The minimum processor allocation for an LPAR is one.

IVM(Integrated virtualization manager): IVM is a h/w management solution that performs a subset of the HMC features for a single server, avoiding the need of a dedicated HMC server.

Live partition Mobility: Allows you to move running AIX or Linux partitions from one physical Power6 server to another without disturb.

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