SWAP
INTERVIEW
QUESTIONS AND ANSWERS
PAGE - 1
1..Which partition is used for virtual memory by a Linux system?
swap
2..How to find
out the usage of memory in linux?
# free –m
# vmstat –s
# top
3..What is Swap Space?
Swap space in Linux is used when the amount of
physical memory (RAM) is full. If the system needs more memory resources and
the RAM is full, inactive pages in memory are moved to the swap space.
4..How
to create swap partition?
use fdisk to
create a partition for 250 MB change the partition type to swap
ready to use the
new partition as swap
decide the UUID,
add the new entry to /etc/fstab
decide the exact size of swap
Check the and
activate the new swap partition
5..What are the memory required for swap space?
System RAM( GB)
|
Min Swap space ( GB )
|
up to 4 GB
|
Minimum 2 GB
|
4 GB to 16 GB
|
Minimum 4 GB
|
16 GB to 64 GB
|
Minimum 8 GB
|
64 GB to 256 GB
|
Minimum 16 GB
|
6..How
to use the swap space?
swapon /extra−swap
7..How
to check the swap space?
free -m
8..What
you mean by swapping out?
The kernel keeps track of which memory pages
that have not been accessed for a period of time to the swap space area called swapping
out
9..Explain
demand paging?
Linux
implements demand paging, which means that pages are swapped in from disk
as needed, and swapped out
to disk when no longer needed
10..How to enable the swap?
swapon /device
11..How
to disable the swap?
swapoff /device
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