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You mean that your filesystem is on a different LUN and you want to extend it to a second LUN? You need a volume manager to do this, normally LVM. The filesystem must be created on top of a logical volume; you can then add the new LUN to the same volume group and extend the filesystem over it.
I suggest you read about LVM, for example the LVM Howto at http://tldp.org.
We are able to see in /var/log folder files like messages0.log, messages1.log and messages What was the difference in these files and what was the use of this files. I had faced this one in one of the interview..
...asking about 'interview questions'. If you don't have the knowledge about such basic things, why are you interviewing for a job that requires you to know them? Not to sound nasty, but it doesn't seem like you've thought this through. The flaws:
An interviewer can as ANYTHING THEY WANT, and accept ANY ANSWER they choose to. Asking for 'interview answers' is pointless.
Even if you DO bluff your way into a job you don't have the knowledge to do...what are you going to to AFTER YOU'RE HIRED??? Ask your co-workers for advice about EVERYTHING? It will be VERY apparent, VERY quickly that you don't have the skills, and you'll be fired.
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