Adding swap

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Revision as of 20:53, 27 December 2007 by Hutch (Talk | contribs)
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Overview

Swap needed to be increased to 8GB from 4GB on a RHEL 5 system. All hard drive space was already allocated, so I had to create a swap file (/files0/swapfile in this example) instead of a swap partition.

$ free
             total       used       free     shared    buffers     cached
Mem:       8177384    4098900    4078484          0     133220    3671700
-/+ buffers/cache:     293980    7883404
Swap:      4192912          0    4192912
  • Create the 4GB swap file.
# dd if=/dev/zero of=/files0/swapfile bs=1024 count=4194304
4194304+0 records in
4194304+0 records out
4294967296 bytes (4.3 GB) copied, 36.1759 seconds, 119 MB/s
  • Setup the swap file.
# mkswap /files0/swapfile
Setting up swapspace version 1, size = 4294963 kB
  • Enable the swap file immediately.
# swapon /files0/swap file
  • Enable the swap file after reboot.

Add the following to /etc/fstab:

/files0/swapfile        swap                    swap    defaults        0 0
  • Confirm the swap file has been added to swap.
$ free
             total       used       free     shared    buffers     cached
Mem:       8177384    8058892     118492          0     116668    7534592
-/+ buffers/cache:     407632    7769752
Swap:      8387208          0    8387208

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