HP Integrity rx7620 Configuration
Hp-ux 11i v3 dynamic npartitions - features and configuration recommendations
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HP-UX 11i v3 Dynamic nPartitions
Features and configuration recommendations
Table of Contents
Introduction ................................................................................................................................... 3
nPartitions Background .................................................................................................................... 3
Dynamic nPartitions operations ......................................................................................................... 3
Cell online activation ................................................................................................................... 3
Cell online deactivation................................................................................................................ 3
Base cells and floating cells .......................................................................................................... 4
Dynamic nPartitions commands......................................................................................................... 4
I/O chassis................................................................................................................................ 4
Scenarios for Dynamic nPartitions...................................................................................................... 5
Adding capacity to an nPartition.................................................................................................... 5
Shifting floating capacity to meet demand peaks .............................................................................. 5
Temporary removal of a partition................................................................................................... 6
Replacement of hardware............................................................................................................. 6
Configuration recommendations for Dynamic nPartitions........................................................................ 7
Minimum amount of memory on base cells ...................................................................................... 7
I/O chassis................................................................................................................................ 8
Duration of Dynamic nPartitions operations...................................................................................... 8
Sensitivity to operating system workload ......................................................................................... 8
Current limits and conditions............................................................................................................. 9
Rollout of Dynamic nPartitions functionality in HP-UX 11i v3................................................................ 9
Dynamic nPartitions, virtual partitions, and Integrity Virtual Machines................................................... 9
Requirement to reset Workload Manager ........................................................................................ 9
Integration with instant capacity..................................................................................................... 9
Interaction with processor sets ..................................................................................................... 10
Cell reset recovery time.............................................................................................................. 10
Summary..................................................................................................................................... 10
Illustrated example of online cell migration........................................................................................ 11
Command sequences for Dynamic nPartitions scenarios ...................................................................... 14
Cell replacement....................................................................................................................... 14
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Summary of Contents for HP Integrity rx7620
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Page 1: Table Of Contents
HP-UX 11i v3 Dynamic nPartitions Features and configuration recommendations Table of Contents Introduction ........................... 3 nPartitions Background ........................3 Dynamic nPartitions operations ......................3 Cell online activation ........................3 Cell online deactivation........................ 3 Base cells and floating cells ......................4 Dynamic nPartitions commands...................... - Page 2 Cell migration........................... 14 Transcript of cell migration operation ....................15 What could possibly go wrong?...................... 19 Glossary ............................. 20 Cell-based HP servers and Dynamic nPartitions .................. 21 For more information........................22...
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Page 3: Introduction
Introduction This white paper introduces the Dynamic nPartitions feature that will debut with HP-UX 11i v3 Update 1. The nPartitions Background section summarizes the properties of nPartitions on HP-UX 11i before the update. The section explains the operations that make nPartitions Dynamic nPartitions operations dynamic. -
Page 4: Base Cells And Floating Cells
Base cells and floating cells A cell is eligible for online deactivation if and only if it is designated as a floating cell. Any cell not specifically designated as a floating cell is a base cell. HP-UX before 11i v3 included support for base cells only. -
Page 5: Scenarios For Dynamic Npartitions
If a cell with I/O (an I/O chassis or core I/O or both) is online activated, then the I/O is also available to the partition. However, the I/O is not automatically activated: a separate command, olrad, is required to activate the I/O. The command for I/O chassis activation is olrad –A -s cell_hardware_path where the I/O chassis connected to the cell specified by cell_hardware_path is online activated. -
Page 6: Temporary Removal Of A Partition
Figure 1 illustrates a configuration appropriate for this scenario. Suppose a server complex consisting of eight cells were partitioned with cells 0 and 1 as base cells in partition 0; cells 2 and 3 as base cells in partition 1; and cells 4 and 5 as base cells in partition 2. Cells 6 and 7 are floating cells that can be assigned to the partition that needs them most at the time. -
Page 7: Configuration Recommendations For Dynamic Npartitions
Only floating cells are available for this type of replacement. You must reboot the partition to replace a base cell. Also, this is not the same as the "online replacement" available for PCI cards, which involves a temporary suspension of access and replacement with identical hardware configured into the identical state. -
Page 8: I/O Chassis
I/O chassis Many workloads are CPU-bound or memory-bound. When using cell online activation to increase the capacity of a partition running such a workload, an I/O chassis does not need to be attached to the cell. In some cases, I/O resources can be considered private to an application and to the partition that hosts it. -
Page 9: Current Limits And Conditions
sessions, or similar measures. Various capacity planning tools are available to match workloads to hardware resource levels. These considerations apply particularly to the Oracle Database products. If the memory allocated to the Oracle Database is based on the full complement of cells in the partition, then the system will not perform well if cells were to be deactivated. -
Page 10: Interaction With Processor Sets
Interaction with processor sets Dynamic nPartitions is fully integrated with processor sets. If the attributes of a processor set are established so that it is not allowed to become empty, then the last SPU in that processor set cannot be online deactivated. If a cell online deactivation operation would cause the processor set to become empty, then that operation will not complete successfully. -
Page 11: Illustrated Example Of Online Cell Migration
Illustrated example of online cell migration This example of using Dynamic nPartitions operations to migrate a cell from one partition to another features a server complex containing eight cells. The complex is partitioned with cells 0, 1, and 2 in nPartition 0. - Page 12 Figure 3. HP-UX instance 0 HP-UX instance 0 HP-UX instance 1 HP-UX instance 1 nPartition 0 nPartition 0 nPartition 1 nPartition 1 cell 0 cell 0 cell 1 cell 1 cell 2 cell 2 cell 3 cell 3 cell 4 cell 4 cell 5 cell 5...
- Page 13 Figure 5. HP-UX instance 0 HP-UX instance 1 nPartition 0 nPartition 1 cell 0 cell 1 cell 2 cell 3 cell 4 cell 5 cell 6 cell 7 base cell float cell float cell float cell base cell base cell base cell base cell Note that cell 2 is assigned to partition 1, but it is inactive, so its resources are not being used by HP-...
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Page 14: Command Sequences For Dynamic Npartitions Scenarios
Command sequences for Dynamic nPartitions scenarios This section shows representative command sequences to perform common Dynamic nPartitions operations. Cell replacement The following command sequence could be used if it is desired to replace or perform hardware maintenance upon the cell whose global slot number is S. It is assumed that the target cell is a floating cell and it has an active I/O chassis connected to it. -
Page 15: Transcript Of Cell Migration Operation
The system name of the HP-UX instance running in partition q is "remote_system" and the userid "administrator" has the required privilege. parolrad -d S parmodify -p p -d S parmodify -p q -a S:floating:y:float:100% Is necessary to wait until the cell has completed its power on sequence. parolrad -a S -u administrator: -g remote_system The parolrad command will prompt for the password associated with the administrator userid. - Page 16 [Cell] Memory (GB) Core Hardware Actual Deconf/ OK/ Cell Next Par Location Usage Deconf Connected To Capable Boot Num ========== ============ ======= ========= =================== ======= ==== === cab0,cell0 Active Core 8/0/8 8.0/0.0 cab0,bay0,chassis0 cab0,cell1 Active Core 8/0/8 8.0/0.0 cab0,bay0,chassis1 cab0,cell2 Inactive 8/0/8 8.0/0.0 cab8,bay0,chassis0...
- Page 17 Online operation has completed successfully. [par0]# olrad -A -s 2 Chassis Add operation in progress... [ NOTE: The chassis add operation may take a few minutes to complete on large configurations. Killing or otherwise aborting this olrad command may not cancel the Chassis Add operation. ] H/W Path Class Description...
- Page 18 cab0,cell2 Active Float 8/0/8 8.0/0.0 cab8,bay0,chassis0 cab0,cell3 Active Base 8/0/8 8.0/0.0 cab8,bay0,chassis1 Notes: * = Cell has no interleaved memory. [par0]# /locinfo2 --- System wide locality info: --- index ldom physid type total free float used 3.93G 3.36G 587.37M 3.94G 3.53G 412.05M 7.94G...
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Page 19: What Could Possibly Go Wrong
What could possibly go wrong? Dynamic nPartitions commands return a message if the operation cannot proceed as intended. The following table gives some troubleshooting hints. Message Likely Cause Remedy The cell shall be assigned The cell to be online activated or Assign the cell to the partition to the local (target) nPar. -
Page 20: Glossary
Glossary Term Definition Each cell in a server complex either is assigned to one of the nPartitions Assigned and unassigned cells in the complex, or it is unassigned and thus is not used by any of the nPartitions. If an I/O chassis is attached to an unassigned cell, then the chassis likewise is not assigned to an nPartition. -
Page 21: Cell-Based Hp Servers And Dynamic Npartitions
Cell-based HP servers that support HP-UX 11i v3 Dynamic nPartitions operations: Cell capacity Server model Two-cell Servers HP 9000 rp7420 Server HP 9000 rp7440 Server HP Integrity rx7620 Server HP Integrity rx7640 Server Four-cell Servers HP 9000 rp8420 Server HP 9000 rp8440 Server HP Integrity rx8620 Server... -
Page 22: For More Information
Dynamic nPartitions. © 2008 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.