Adding Swap Space on a Linux System

Unable to allocate physical memory during WLS start will be resolved by adding more SWAP space as below:

1. Become a superuser (root) by typing:

   % su
   Password: root-password

2. Create a file in a selected directory to add swap space by typing:

   dd if=/dev/zero of=/dir/myswapfile bs=1024 count=number_blocks_needed

   where dir is a directory in which you have permission to add swap space. The myswapfile is the name of the swap file you are creating. The number_blocks_needed is an amount of 1024-byte blocks you want to create. See the dd(1) man page for more information.

3. Verify that the file was created by typing:

   ls -l /dir/myswapfile

   The new file appears in the directory.

4. Initialize the new swap area by typing:

   mkswap /dir/myswapfile

   See the mkswap(8) man page for more detailed information.

5. Run the swapon command to enable the new swap space for paging and swapping by typing the following:

   swapon -a /dir/myswapfile

6. Verify that the extra swap space was added by typing:

   swapon -s

   The output shows the allocated swap space.

IN SHORT FOLLOWING COMMANDS NEED TO BE EXECUTED :

dd if=/dev/zero of=/oraprod/myswapfile bs=2G count=5

ls -lhrt /oraprod/myswapfile

[root@shsebs121mt002 ~]#  mkswap /oraprod/myswapfile

Setting up swapspace version 1, size = 10485736 KiB

no label, UUID=6eaf7636-9f19-4376-8a7e-5090bc4a3b40

chmod 600 /oraprod/myswapfile

swapon -a /oraprod/myswapfile

swapon -s

dd if=/dev/zero of=/orastage/myswapfile bs=2G count=5

# cat /proc/swaps

Filename				Type		Size	Used	Priority
/dev/sda10                              partition	8282108	0	-1

# free -h

             total       used       free     shared    buffers     cached
Mem:          7.7G       4.7G       3.0G       408M       182M       1.8G
-/+ buffers/cache:       2.7G       5.0G
Swap:         7.9G         0B       7.9G
# swapon --all
If want to view a summary of swap space usage by device
# swapon --summary

Filename				Type		Size	Used	Priority
/dev/sda10                              partition	8282108	0	-1