Aix - Logical Partitioning - Creating a mixed production and test environment
We can create a combined production and test environment on the same server. The production partition can run your main business applications, and the test partition is used to test software. A failure in a test partition, while not necessarily planned, will not disrupt normal business operations.
Monday, July 6, 2009
Aix - Logical Partitioning - Maintaining Independent Servers
Aix - Logical Partitioning - Maintaining Independent Servers
Logical isolation of software can be achieved by dedicating a portion of the resources (disk storage unit, processors, memory, and I/O devices) to a partition Software’s which might not run well together on a single machine, can be isolated and run efficiently in separate partitions.Logical partitions also have some hardware fault tolerance.
Logical isolation of software can be achieved by dedicating a portion of the resources (disk storage unit, processors, memory, and I/O devices) to a partition Software’s which might not run well together on a single machine, can be isolated and run efficiently in separate partitions.Logical partitions also have some hardware fault tolerance.
Friday, July 3, 2009
AIX - A Host Ethernet Adapter (HEA)
A Host Ethernet Adapter (HEA) allows multiple logical partitions to share a single physical Ethernet adapter. Unlike most other types of I/O devices, you can never assign the HEA itself to a logical partition. Instead, multiple logical partitions can connect directly to the HEA and use the HEA resources. This allows these logical partitions to access external networks through the HEA without having to go through an Ethernet bridge on another logical partition.
AIX - Virtual I/O
AIX - Virtual I/O
Allows logical partitions to access and use I/O resources on other logical partitions. For example, virtual Ethernet allows you to create a virtual LAN that connects the logical partitions on your server to each other. If one of the logical partitions on the server has a physical Ethernet adapter that is connected to an external network, you can configure the operating system of that logical partition to connect the virtual LAN with the physical Ethernet adapter. This allows the logical partitions on the server to share a physical Ethernet connection to an external network.
Allows logical partitions to access and use I/O resources on other logical partitions. For example, virtual Ethernet allows you to create a virtual LAN that connects the logical partitions on your server to each other. If one of the logical partitions on the server has a physical Ethernet adapter that is connected to an external network, you can configure the operating system of that logical partition to connect the virtual LAN with the physical Ethernet adapter. This allows the logical partitions on the server to share a physical Ethernet connection to an external network.
AIX - Dynamic logical partitioning
Dynamic logical partitioning feature allow resources to be moved to, from, and between running logical partitions manually without shutting down or restarting the logical partitions. This allows us to share devices that logical partitions use occasionally. For example, if the logical partitions on your server use an optical drive occasionally, you can assign a single optical drive to multiple logical partitions as a desired device. The optical drive would belong to only one logical partition at a time, but you can use dynamic logical partitioning to move the optical drive between logical partitions as needed. On servers that are managed using the Integrated Virtualization Manager, dynamic logical partitioning is supported only for the management partition. Dynamic logical partitioning is not supported on servers that are managed using the Virtual Partition Manager.
AiX - Logical Partioning - How resources are shared
Following are the ways in which resources are shared
Micro-Partitioning feature allows processor resources to be shared automatically among logical partitions that use the shared processor pool. The shared processor pool includes all processors on the server that are not dedicated to specific logical partitions. Each logical partition that uses the shared processor pool is assigned a specific amount of processor power from the shared processor pool. If the logical partition needs more processor power than its assigned amount, the logical partition is set by default to use the unused processor power in the shared processor pool. The amount of processor power that the logical partition can use is limited only by the virtual processor settings of the logical partition and the amount.
Micro-Partitioning feature allows processor resources to be shared automatically among logical partitions that use the shared processor pool. The shared processor pool includes all processors on the server that are not dedicated to specific logical partitions. Each logical partition that uses the shared processor pool is assigned a specific amount of processor power from the shared processor pool. If the logical partition needs more processor power than its assigned amount, the logical partition is set by default to use the unused processor power in the shared processor pool. The amount of processor power that the logical partition can use is limited only by the virtual processor settings of the logical partition and the amount.
AIX - Advantages of Logical Partitioning
The following are benefits of logical partitioning on a server:
2.1 Consolidating servers
A logically partitioned server reduces the number of servers that are needed in an enterprise. We can consolidate many servers into a single logically partitioned system. This eliminates the use of additional equipment & expenses.
2.2 Sharing resources
The ability to share resources among many logical partitions allows us to increase resource utilization on the server and to move the server resources to where they are needed. We can easily move the hardware resources from one logical partition to another logical partitioning whenever we need.
2.1 Consolidating servers
A logically partitioned server reduces the number of servers that are needed in an enterprise. We can consolidate many servers into a single logically partitioned system. This eliminates the use of additional equipment & expenses.
2.2 Sharing resources
The ability to share resources among many logical partitions allows us to increase resource utilization on the server and to move the server resources to where they are needed. We can easily move the hardware resources from one logical partition to another logical partitioning whenever we need.
AIX - Introduction to Logical Partitioning
1. What is logical partitioning?
Logical partitioning is the ability to make a server run as if it were two or more independent servers. When you logically partition a server, you divide the resources on the server into subsets called logical partitions or LPAR We can install different operating system on each logical partition, and each logical partition runs as an independent logical server with independent operating system and the resources that you have allocated to the logical partition. Processors, memory, and input/output devices are examples of resources that you can assign to logical partitions. Following are the Operating systems which can be installed on each independent Logical partition.
AIX,
i5/OS,
Linux operating systems and Virtual I/O Server.
All the Logical partitions partitioned from a single server share a few system attributes, such as the system serial number, system model, and processor feature code. All other system attributes on each Logical partition can vary from one logical partition to another.
Logical partitioning is the ability to make a server run as if it were two or more independent servers. When you logically partition a server, you divide the resources on the server into subsets called logical partitions or LPAR We can install different operating system on each logical partition, and each logical partition runs as an independent logical server with independent operating system and the resources that you have allocated to the logical partition. Processors, memory, and input/output devices are examples of resources that you can assign to logical partitions. Following are the Operating systems which can be installed on each independent Logical partition.
AIX,
i5/OS,
Linux operating systems and Virtual I/O Server.
All the Logical partitions partitioned from a single server share a few system attributes, such as the system serial number, system model, and processor feature code. All other system attributes on each Logical partition can vary from one logical partition to another.
Sunday, June 21, 2009
AIX - Dumps Space
AIX - Dumps Space
The system dump facility copies critical information to the dump device when a system crash occurs. This information is critical for determining the cause of the crash.
Sysdumpdev -l -- Shows where the system dump location is currently located.
Sysdumpdev -P -p/dev/hd9 -- Changes the primary dump device to hd9.
Sysdupmdev -e -- Estimates the size of the current dump.
Smitty dump -- Access dump configuration through Smit.
The system dump facility copies critical information to the dump device when a system crash occurs. This information is critical for determining the cause of the crash.
Sysdumpdev -l -- Shows where the system dump location is currently located.
Sysdumpdev -P -p/dev/hd9 -- Changes the primary dump device to hd9.
Sysdupmdev -e -- Estimates the size of the current dump.
Smitty dump -- Access dump configuration through Smit.
Monday, June 8, 2009
AIX - SMIT
smit:
A lot of the sys admin task in AIX can be done thru smit (or smitty for TUI version). It can accept a parameter to get to a specific menu section right away.
Here are some example:
smit mktcpip # configure network parameters
smit chfs # change file system, eg grow/extend it.
smit lsprt # list printers (don't list all, may need to go thru long menu)
smit installp # Add new software
smit update # add patches
smit update_all # automatic add patches to existing sw, no complain if patch is
not relevant
smitty fastpath:
Action Prefix Device Abbreviation
------ ------ ------ ------------
(add) mk (printer) prt
(change) ch (tty) tty
(list) ls (pty) pty
(remove) rm (disk) dsk
(cdrom) cdr
(diskette) dskt
(tape) tpe
(adapter) adp
lang
Keystrokes:
F3 or ESC, 3 Cancel, go back
F4 or ESC, 4 Provide list of items to choose from
F6 or ESC, 6 Show command that smit will actually run
F10 or ESC, 10 Exit smitty
A lot of the sys admin task in AIX can be done thru smit (or smitty for TUI version). It can accept a parameter to get to a specific menu section right away.
Here are some example:
smit mktcpip # configure network parameters
smit chfs # change file system, eg grow/extend it.
smit lsprt # list printers (don't list all, may need to go thru long menu)
smit installp # Add new software
smit update # add patches
smit update_all # automatic add patches to existing sw, no complain if patch is
not relevant
smitty fastpath:
Action Prefix Device Abbreviation
------ ------ ------ ------------
(add) mk (printer) prt
(change) ch (tty) tty
(list) ls (pty) pty
(remove) rm (disk) dsk
(cdrom) cdr
(diskette) dskt
(tape) tpe
(adapter) adp
lang
Keystrokes:
F3 or ESC, 3 Cancel, go back
F4 or ESC, 4 Provide list of items to choose from
F6 or ESC, 6 Show command that smit will actually run
F10 or ESC, 10 Exit smitty
Subscribe to:
Posts (Atom)