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Method to preserve install the Work load Partitions

IP.com Disclosure Number: IPCOM000198341D
Publication Date: 2010-Aug-05
Document File: 2 page(s) / 80K

Publishing Venue

The IP.com Prior Art Database

Abstract

Method to Preserve Install the Work Load Partitions Abstract: This idea acts as a solution to preserve the System Workload Partitions (WPARs) after reinstallation of the Operating system. Preserving WPARs includes preserving its applications, configuration and its data inside it. Existing System: The existing systems do not have any way to preserve the workload partitions of a system after install of BASE OS. Once the system is reinstalled, we loose all the wpars that were on the system and the user data in it. At certain times, the requirement of the user is to upgrade the operating system. But to do this the user has to align with the fact that the wpars will be lost with the data in it and will have to put the effort recreating the same environment all over and again after install. Also the user has to install the Softwares required for the application that was running on the WPAR. The idea basically speaks on how we can retain the wpars after doing a reinstall of the operating system. By preserving wpar i.e preserving system data (WPAR environment) and the user data (application data) it will avoid us from the overhead of recreating the wpar environments and the application or taking physical backups thus saving time. Proposed System: Disclosed is a method that acts as a solution to preserve the System WPARs after reinstallation of the OS. The WPARs are not preserved with the current install feature. The only way to get the wpars after reinstallation of Base OS is to recreate them. The proposed idea overcomes the factor that wpars will be lost after install of Operating system along with the user data on it. This idea has following advantages compared to existing system: 1. Reduces the overhead of re-creating the same wpar environments after install. 2. Reduces the over head of taking Physical backup of wpar. 3. Saves up user time of recreating wpar environments. 4. Base OS upgrading without harming wpar environments. 5. The data inside wpar is saved without any discrepancy. Background: WPAR (Workload Partition): A global environment which has an all encompassing view of processes, IPC, file systems, devices and system level objects within an UNIX system. This Global environment can be thought of as the traditional (AIX) UNIX login environment. Pars (AIX) provide isolation of software services, applications and administration italicizing flexible software-defined boundaries within a single instance of the (AIX) operating system. An environment almost similar to a standalone UNIX system. Wpars are two types, they are System WPARS and Application WPARS. The form of WPAR which creates a virtual system partition providing system services and a form of init is referred to as a "system WPAR." System WPAR provide an autonomous layer of administration capability without imposing responsibilities of maintaining the physical resources or base operating system of the machine, which remains the responsibility of a global system administrator. This WPAR type runs most of the system services that would be found in a standalone system and does not share writeable file systems with any other WPAR or the Global system Another form of WPAR which will eventually be supported is an "application WPAR", which runs in an isolated environment but which may not provide system services and which may run some arbitrary application. INSTALL methods: AIX provides three types of installation methods: 1. New and Complete Overwrite Install This installation method is used on a new machine or if you want to completely overwrites an existing version of the base operating system (BOS) that is installed on your system. 2. Migration Install This installation method is used to upgrade AIX between versions and releases while preserving the existing root volume group. 3. Preservation Install This installation method is used when a version of BOS is installed on your system and you want to preserve the user data in the root volume group

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Method to preserve install the Work load Partitions

This idea can be implemented for system wpars on AIX as follows:
1. This idea provides an option for the users during wpar creation if they want to preserve the system wpar creating.
2. This idea will create an LV for storing the list of WPARS created with preserve option Eg------ WPARS.

reserve add this LV name entry in the /etc/


3. We will also provide an option say WPARs preserve install during Base OS installation in which case we preserve the wpars during installation.
4. on selection of "WPARs Preserve install", following sequence of steps will be performed.

. The preserve.list file is used and as per that the user LV's are retained along with the User data inside it.

In case of
shared wpars the file systems that are preserved after preserve install are: /wpars/
/wpars/

/home
/wpars/

/tmp
/wpars/

/var

Private wpars the file systems that are preserved after preserve install are : /wpars/
/wpars/

/home
/wpars/

/tmp
/wpars/

/var
/wpars/

/usr
/wpars/

/opt

N

 FS wpars does not have any LV associated with it, so just the name of the wpar will be in the wpar list.

Also the Logical volume WPARS.

also retained.

We use the list to know the system wpars that has to be recreated after reinstall of the OS by using the list we create a directory by WPAR name in the /wpars directory
Then recreate the wpar with the same name as the directory created above in step 3 with

  reserve option. Since the preserved filesystems are used, the wpars are re...