LPAR BASICS PDF

Sharing of resources between LPARs enables more efficient utilization of physical resources and facilitates consolidation. Workload Partitions enable administrators to virtualize the AIX operating system, by partitioning an AIX operating system instance into multiple environments. WPAR is a pure software solution and has no dependencies on hardware features. Live Partition Mobility enables greater control over the usage of resources in the data center by enabling the migration of a logical partition from one physical system to another. This feature enables the transfer of a configuration from source to destination without disrupting the hosted applications or the setup of the operating system and applications.

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That may have been true when first released, but I believe SPs are being enhanced well beyond VGs now. With capabilities such as shared storage pools, and file-backed-Optical. Or can I do this with a VG and I'm just not aware of it? It was confusing for me, and after reading some docs, I realized they are very similar. I think you made a good point about shared storage pools, and that is possibly a difference. Hi, If Uncapped mode is enabled, whether the processor units has been taken upto desired value or beyond the desired value in the shared processor pool.

Please clarify. Regards, Siva. Hi, It can take beyond the desired value in case of uncapped mode. That is the main difference between capped and uncapped mode. Hi, There is maximum limit of acquiring processor in the shared free processor pool. Yes, that is true. Hi, Does we change the desired value memory online without any downtime.? Hi, yes it can be done online as a DLPAR operation Some notes: - it can't be larger than maximum memory - should be changed in profile as well, so next reboot will take this new amount of memory.

Hi, Sorry, had wrongly asked question. Whether we can increase the maximum value online? Hi, maximum value can't be increased online. LPAR profile must be changed and reboot is needed new maximum value must be loaded from profile. Hi , I have a scenario here. Incase if Partition A need one more cpu which is free in partition B , is possible to be acquired by partion A?

Hi, short answer is yes, when you have uncapped partitions, they can exceed the entitled capacity when resources are available. But they can take it back its own processing capacity form other LPARs when they need it.

There are 2 other things what you should know as well: 1. This is because 1 virtual processor represents 1 CPU. For example 5,6,7 or 8 if you would like that 1 LPAR could use all the resources if needed.

I have system with Entitled Capacity : 0. There is some description above, but Entitled Capacity: 0. Please correct me if am wrong. Thanks, Varun. I guess for maximum value you can type anything, but it is useless to write more than what is allowed by the system.

Hi, changing capped-uncapped can be done only in the LPAR profile and after that profile activation is needed. Thanks AR. Thank you in Advance. Hi, 1. I guess, because there are no more user processes : If needed more, I think it will be dispatched there as well.

It is leading me to wonderfull path. Hi, yes, it is possible. Or you can do it in HMC command line as well. You asked about LPAR name chenge, not the hostname change, there is a difference between these.

Hi Balazs. Quick question. Can I virtualize a Power 5 server without spending a single dollar in licensing fees?? Is the VIOS software free? If so, where do I download it from? As far as I know if you have a maintenance contract with IBM, then you are able to download base level images with a special registration , otherwise only updates are free at IBM fix central. Tested in Blades JS12 should work for your system as well.

Regards Rahul. DLPAR to increase cpu is only on capped partitions not for the uncapped partition, since it does automatically. Thank you Sir. I could not understand active memory expansion. Like according to above we can increase the value of physical memory capacity. Adapter Virt. With the subset of HMC server functionality, IVM provides a solution that enables the administrator to quickly set up a system.

It is a firmware layer sitting between the hosted operating systems and the server hardware, and it is always activated. It delivers functions that enable capabilities: dedicated or micro partitioning, virtual processors, virtual ethernet- scsi- fibre channel- adapters and virtual consoles.

The minimum processor allocation for an LPAR is one 1 whole processor, and can be as many as the total number of installed processors in the server. Each processor is wholly dedicated to the LPAR. It is not possible to mix shared processors and dedicated processors in the same partition. Micro-Partitioning Micro-Partitioning is the ability to distribute the processing capacity of one or more physical processors among one or more logical partition. Shared-processor pools In POWER5-based servers, a physical shared-processor pool is a set of physical processors that are not dedicated to any logical partition.

This capability allows a system administrator to create a set of micro-partitions with the purpose of controlling the processor capacity that the set of micro-partitions can consume from the physical shared-processor pool. The set of micro-partitions form a unit and this can be managed for example how much processor capacity it can use.

Micro-partitions are created within SPP0 by default, and processor resources are shared in the same way. If several partitions from different shared processor pools are competing for additional resources, the partitions with the highest weight will be served first. Shared Storage Pools are using thin provisioning.

These are used sometimes interchangeably. So volume group can refer to both volume groups and storage pools, and logical volume can refer to both logical volumes and storage pool backing devices. Active Memory Expansion: Active Memory Expansion is the ability to expand the memory available to an AIX partition beyond the amount of assigned physical memory.

Active Memory Expansion compresses memory pages so it generates CPU load to provide additional memory capacity for a partition. It is a Power7 feature. Active Memory Sharing: Active Memory Sharing AMS enables the sharing of a pool of physical memory among partitions on a single Power server Power 6 or later , helping to increase memory utilization and drive down system costs. Active Memory Deduplication: To optimize memory use, Active Memory Deduplication avoids data duplication in multiple distinct memory spaces.

On traditional LPARs, multiple identical data are saved across different positions in main memory. Active Memory Deduplication combines the data in just one physical memory page and frees the other chunks with identical data. The result is multiple logical memory pages pointing to the same physical memory page, thus saving memory space.

Acitive Memory Mirroring: It is called sometimes system firmware mirroring. Active Memory Mirroring for the hypervisor is designed to mirror the main memory that is used by the system firmware to ensure greater memory availability. When enabled, an uncorrectable error that results from a failure of main memory used by the system firmware will not cause a system-wide outage. The system maintains two identical copies of the system hypervisor in memory at all times.

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LPAR - logical partitioning

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Short for l ogical par titioning , a system of taking a computer's total resources - processors , memory and storage -- and splitting them into smaller units that each can be run with its own instance of the operating system and applications. Logical partitioning can also be used to keep testing environments separated from the production environments. Since the partitions in effect act as separate physical machines, they can communicate with each other. IBM was the first to use logical partitioning in

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