Need some info for interview,

Hi,
Could someone please answer this, as i have to prepare for an interview.
Q) List several ways (at least 3) to gather the following information from RHEL5.x server (minimal terminal packages installed no graphics utilities):
1) Free memory available
2) Number of luns
3) Set the hostname of the system
4) How many tcp network connections are in use and by whom
Q)“What possible issues or challenges could arise in a Linux Oracle RAC environment using NIS based lookup? Give an example related to ASM devices”
Hoping for a quick reply
Thank You,

ateeqrahman wrote:
Could someone please answer this, as i have to prepare for an interview.
Q) List several ways (at least 3) to gather the following information from RHEL5.x server (minimal terminal packages installed no graphics utilities):
1) Free memory available
2) Number of luns
3) Set the hostname of the system
4) How many tcp network connections are in use and by whomPersonally, I would not bother asking or answering these question on either side of the interview desk. It does not test knowledge - as you yourself has just now proved by this thread. Knowing what commands can be used does not mean you will know when to use these commands and how to interpret the data supplied by them.
Technical answers like these can often be answered directly from the manual. And that is the exact purpose of a manual - containing such technical details. Why? Because it is impossible to remember all details for commands and software products being used.
What is important is knowing the technical concepts, fundamentals and architecture. Knowing how to analyse a problem, break it down into technical components/layers and troubelshoot these.. and which and what manuals to use to get the technical details as and when required.
Take for example the question of the number of LUNs. Which LUNs? ASM? OCFS? Raw?
And why is the number important? Is this looking at devices at SCSI level? This can then include local drives too. Looking at multipath devices instead? A a single storage device can be partitioned and used as multiple LUNs (e.g. partition 1 as a OCR disk, partition 2 as an OCFS disk, and the remaining partition 3 as an ASM disk). Thus WHAT is the requirement or problem that needs to be addressed by knowing "the number of LUNs"?
The technical question as you list above are meaningless and useless in an interview. If you are asked such questions in an interview, I would have grave concerns about working in that environment as it is a sign that the actual technical components of that environment is not understood in the slightest bit. Nor the type of person required to maintain, support and develop in it...
It means the interviewer is clueless and working from a so-called technical checklist of questions.. and will be incapable of understanding real technical answers as all he/she has is the pat answer for that checklist question.

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