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isolated linux ?

i want to  know what is  isolated linux ?
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ratheesh_k
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ratheesh_k
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NopiusCommented:
It depends on context.

In networking, isolated, means disconnected from net.
In clusters, isolated means running to it's own (when other node is not visible).
etc...

isolated means not a part of something else...

But there is no such term as 'isolated linux' without some context.

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NopiusCommented:
another isolation type may be for some kind of virtualization, like Xen, UML  (user mode linux), virtuozzo, vmware, ....
You may find all these terms in Google.
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ratheesh_kAuthor Commented:
hi hopius ,

 i m in context of vitualization ....can u explain me the difference between normal and virtualized linux ........................


Thanks .
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NopiusCommented:
Ok.

There are several levels of virtualization, you may read more on wikipedia: http://en.wikipedia.org/wiki/Virtualization

So, even virtualized linux may differ more or less then normal.

The lowest difference between normal and virtualized when you use hardware virtualization (vmware).
Then differences are in:
- a fixed hardware (from virtualized Linux point of view you have always the same hardware). So you are can't develop hardware drivers in such Linux, if this hardware is not visible for you
- not all host machine hardware is virtualized (suppose video capture PCI card in host OS is invisible in guest OS)
- performance in guest OS is poor (that's much related to vmware) especially when you have lots of hardware interrupts.
- virtualization software may have bugs, so your guess OS may not work so stable in some conditions

When we look to the other virtualization layer (not hardware), we will see another diferences. But always we have a performance penalty (5% is the minimum I saw).

What benefits of virtualized Linux:
- you may have many hosts running on the same machine. That's a benefit if your machine is powerful and each host takes a little resources.
- migration of virtualized Linux to another hardware is painless
- OS crash (say kernel panic) in virtualized Linux doesn't lead to entire system crash

If you choose what exact virtualization you need to compare with normal Linux, I can provide more info.

Hardware level virtualization: VMware - VirtualPC - Virtual Server 2005 - QEMU with kqemu
OS level virtualization: Jail - Linux-VServer - OpenVZ - Virtuozzo - Solaris Zones
Instruction set interpretation: Bochs - PearPC - QEMU
Paravirtualization and porting: Xen - UML

More links:
http://en.wikipedia.org/wiki/X86_virtualization
http://www.xensource.com/xen/xen/index.html
critics:  http://www.virtualiron.com/fusetalk/blog/blogpost.cfm?threadid=10&catid=3
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ratheesh_kAuthor Commented:
k .....y we use isolated linux ?
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NopiusCommented:
Sorry, ratheesh_k. I don't understand your question.
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