Adding swap

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Current revision (20:56, 27 December 2007) (edit) (undo)
 
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Line 8: Line 8:
-/+ buffers/cache: 293980 7883404
-/+ buffers/cache: 293980 7883404
Swap: '''4192912''' 0 4192912
Swap: '''4192912''' 0 4192912
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 +
== Procedure ==
* Create the 4GB swap file.
* Create the 4GB swap file.
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# '''mkswap /files0/swapfile'''
# '''mkswap /files0/swapfile'''
Setting up swapspace version 1, size = 4294963 kB
Setting up swapspace version 1, size = 4294963 kB
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* Enable the swapfile immediately.
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* Enable the swap file immediately.
# '''swapon /files0/swap file'''
# '''swapon /files0/swap file'''
* Enable the swap file after reboot.
* Enable the swap file after reboot.
Add the following to ''/etc/fstab'':
Add the following to ''/etc/fstab'':
/files0/swapfile swap swap defaults 0 0
/files0/swapfile swap swap defaults 0 0
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* Confirm the swap file has been added to swap.
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$ '''free'''
 +
total used free shared buffers cached
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Mem: 8177384 8058892 118492 0 116668 7534592
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-/+ buffers/cache: 407632 7769752
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Swap: '''8387208''' 0 8387208
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 +
== Links ==
 +
* [http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/sysadmin-guide/s1-swap-adding.html Adding Swap Space]

Current revision

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

Procedure

  • 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

Links

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