Aix - Logical Partitioning - Virtual Processor Assignment
If you create a partition profile that is set to use shared processors, the HMC calculates a minimum, maximum, and desired number of virtual processors for
the partition profile. The calculation is based upon the minimum, maximum, and desired number of processing units that you specify for the partition profile. By default, the virtual processor settings are calculated as follows:
• The default minimum number of virtual processors is the minimum number of processing units (rounded up to the next whole number). For example, if the minimum number of processing units is 0.8, the default minimum number of virtual processors is 1.
• The default desired number of virtual processors is the desired number of processing units (rounded up to the next whole number). For example, if the desired number of processing units is 2.8, the default desired number of virtual processors is 3.
• The default maximum number of virtual processors is the maximum number of processing units rounded up to the next whole number and multiplied by two. For example, if the maximum number of processing units is 3.2, the default maximum number of virtual processors is 8 (4 times 2).
When you activate the logical partition using the partition profile on the HMC, the logical partition is assigned the desired number of virtual processors. You can then use dynamic logical partitioning to change the number of virtual processors to any number between the minimum and maximum values, so long as the number of virtual processors is greater than the number of processing units that are assigned to the logical partition. Before changing the default settings, performance modeling should be performed.
For example, you create a partition profile on the HMC with the following processor unit settings.
• Minimum processing units 1.25
• Desired processing units 3.80
• Maximum processing units 5.00
The default virtual processor settings for this partition profile on the HMC are as follows.
• Minimum virtual processors 2
• Desired virtual processors 4
• Maximum virtual processors 10
When you activate the logical partition using this partition profile on the HMC, the operating system sees four processors, because the logical partition is activated with the desired value of four virtual processors. Each of these virtual processors has 0.95 processing units supporting the work assigned to the processor. After the logical partition is activated, you can use dynamic logical partitioning to change the number of virtual processors on the logical partition to any number between 2 and 10, so long as the number of virtual processors is greater than the number of processing units that are assigned to the logical partition. If you increase the number of virtual processors, bear in mind that you will have less processing power supporting the work assigned to each processor.
Wednesday, July 8, 2009
Aix - Logical Partitioning - Memory and Processor Resource Assignment
Aix - Logical Partitioning - Memory and Processor Resource Assignment
When you create a partition profile for a logical partition, you set up the desired,minimum, and maximum amounts of memory and processor resources that you want for the logical partition. (Where applicable, this also applies to 5250 CPW.)The desired value is the resource amount that the logical partition gets if you do not over commit the resource on the managed system. If the desired amount of resources is available when you activate the partition profile, then the logical partition starts with the desired amount of resources. However, if the desired amount of resources is not available when you activate the partition profile, then the resources on your managed system are over committed. In that case, if the amount of resources that are available on the managed system is equal to or greater than the minimum amount of resources in the partition profile, then the logical partition starts with the available amount of resources. If the minimum amount of resources is not met, then the logical partition does not start.
Aix - Logical Partitioning - Partition Profile
Aix - Logical Partitioning - Partition Profile
A partition profile is a record on the Hardware Management Console (HMC) that
specifies a possible configuration for a logical partition. When you activate a
logical partition using a partition profile, the managed system attempts to start
the logical partition using the configuration information in the partition profile.
A partition profile specifies the desired system resources for the logical partition
and the minimum and maximum amounts of system resources that the logical
partition can have. The system resources specified within a partition profile
includes processors, memory, and I/O resources.
Each logical partition on a managed system that is managed by an HMC has at
least one partition profile. If desired, you can create additional partition profiles
with different resource specifications for your logical partition. If you create
multiple partition profiles, you can designate any partition profile on the logical
partition to be the default partition profile. The HMC activates the default profile if
you do not select a specific partition profile to be activated. Only one partition
profile can be active at one time. To activate another partition profile for a logical
partition, you must shut down the logical partition before you activate the other
partition profile.
A partition profile is identified by partition ID and profile name. Partition IDs are
whole numbers used to identify each logical partition that you create on a
managed system, and profile names identify the partition profiles that you create
for each logical partition.
A partition profile is a record on the Hardware Management Console (HMC) that
specifies a possible configuration for a logical partition. When you activate a
logical partition using a partition profile, the managed system attempts to start
the logical partition using the configuration information in the partition profile.
A partition profile specifies the desired system resources for the logical partition
and the minimum and maximum amounts of system resources that the logical
partition can have. The system resources specified within a partition profile
includes processors, memory, and I/O resources.
Each logical partition on a managed system that is managed by an HMC has at
least one partition profile. If desired, you can create additional partition profiles
with different resource specifications for your logical partition. If you create
multiple partition profiles, you can designate any partition profile on the logical
partition to be the default partition profile. The HMC activates the default profile if
you do not select a specific partition profile to be activated. Only one partition
profile can be active at one time. To activate another partition profile for a logical
partition, you must shut down the logical partition before you activate the other
partition profile.
A partition profile is identified by partition ID and profile name. Partition IDs are
whole numbers used to identify each logical partition that you create on a
managed system, and profile names identify the partition profiles that you create
for each logical partition.
Aix - Logical Partitioning - HMC
Aix - Logical Partitioning - HMC
The Hardware Management Console (HMC) is a hardware appliance that you can use to configure and control one or more managed systems. You can use the HMC to create and manage logical partitions and activate Capacity Upgrade on Demand. Using service applications, the HMC communicates with managed systems to detect, consolidate, and send information to service and support for analysis.
The HMC also provides terminal and 5250 console emulation for the logical partitions on your managed system. You can connect to logical partitions from the HMC itself, or you can set up the HMC so that you can connect to logical partitions remotely through the HMC. HMC terminal and 5250 console emulation provides a dependable connection that you can use if no other terminal or console device is connected or operational. HMC terminal and 5250 console emulation is particularly useful during initial system setup, before you have configured your terminal or console of choice.
This figure illustrates the logical partitions and the server firmware on the IBM® Systems and eServer™ hardware. The server firmware is code that is stored in system flash memory on the server. The server firmware directly controls the resource allocations on the server and the communications between logical partitions on the server. The HMC connects with the server firmware and specifies how the server firmware allocates resources on the server. If you use a single HMC to manage a server, and the HMC malfunctions or become disconnected from the server firmware, then the server continues to run, but you will not be able to change the logical partition configuration of the server or manage the server. If desired, you can attach an additional HMC to act as a backup and to provide a redundant path between the server and IBM service and support.
There are two different HMC user interfaces.
• Version 7 and later of the HMC uses a web-based user interface. You can configure the HMC to allow remote connections using a supported web browser.
• Version 6 and earlier of the HMC uses a window-based user interface. You can configure the HMC to allow remote connections using the Web-based System Manager.
The Hardware Management Console (HMC) is a hardware appliance that you can use to configure and control one or more managed systems. You can use the HMC to create and manage logical partitions and activate Capacity Upgrade on Demand. Using service applications, the HMC communicates with managed systems to detect, consolidate, and send information to service and support for analysis.
The HMC also provides terminal and 5250 console emulation for the logical partitions on your managed system. You can connect to logical partitions from the HMC itself, or you can set up the HMC so that you can connect to logical partitions remotely through the HMC. HMC terminal and 5250 console emulation provides a dependable connection that you can use if no other terminal or console device is connected or operational. HMC terminal and 5250 console emulation is particularly useful during initial system setup, before you have configured your terminal or console of choice.
This figure illustrates the logical partitions and the server firmware on the IBM® Systems and eServer™ hardware. The server firmware is code that is stored in system flash memory on the server. The server firmware directly controls the resource allocations on the server and the communications between logical partitions on the server. The HMC connects with the server firmware and specifies how the server firmware allocates resources on the server. If you use a single HMC to manage a server, and the HMC malfunctions or become disconnected from the server firmware, then the server continues to run, but you will not be able to change the logical partition configuration of the server or manage the server. If desired, you can attach an additional HMC to act as a backup and to provide a redundant path between the server and IBM service and support.
There are two different HMC user interfaces.
• Version 7 and later of the HMC uses a web-based user interface. You can configure the HMC to allow remote connections using a supported web browser.
• Version 6 and earlier of the HMC uses a window-based user interface. You can configure the HMC to allow remote connections using the Web-based System Manager.
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