Originally Posted by kapilbajpai88
having 2G RAM with 160GB HDD.
Do I understand correctly you mean a single hard drive of 160GB (not multiple smaller drives totaling 160GB)?
is it better to involve RAID and LVM partitions from the very beginning ?
Software RAID within a single drive is possible, but I can't imagine how it might ever be a good idea.
My own opinion of LVM matches what Lazlow wrote in post #4 of this thread.
Could anybody please suggest me what would be the perfect partition values, provided we are going to install most of the users and softwares under /home and databases under /usr ??
The easiest and most flexible way to partition the disk is to just have a / partition and a swap partition.
As soon as you split anything (such as /home or /usr) out of / you are making a prediction about how much space will be needed by each side of that split. Any error in that prediction is a cost of the split. The split may also cost extra head motion while the system is in use.
So there needs to be a big benefit to splitting, to justify the costs. If you don't know what that benefit is for you, then you probably won't split right to get it anyway.
I will admit this is "do what I say, not what I do" because I split my own 500GB drive sloppily into many partitions. That made sense for me because:
1) 500GB was a lot more than I actually need so I don't care about using it efficiently.
2) I use Mepis and the upgrade from Mepis 7 to Mepis 8, as expected, went much smoother because I had extra partitions to play with.
3) The system is more experimental than production. Extra partitions give flexibility for playing with other distributions, etc.
I don't expect RHEL in 160GB at a workplace with "users" (I paid attention to that word being plural) would share any of those characteristics with my single user home Mepis system.
So unless you have a good understanding of why and how much you should split / don't split it.
If you have a good understanding of what you will be running on that RHEL system, you might be able to make a good estimate of how much swap space you will need. I doubt you have the necessary information to make any decent estimate of swap space needed. So make the swap partition 4GB and hope it was a good guess.