Adding swap

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(New page: == 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 swapfile (''/files0/swapfile'' in this exam...)
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== Overview ==
== 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 swapfile (''/files0/swapfile'' in this example) instead of a swap partition.
+
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'''
$ '''free'''
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Swap: '''4192912''' 0 4192912
Swap: '''4192912''' 0 4192912
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* Create the 4GB swapfile.
+
* Create the 4GB swap file.
# '''dd if=/dev/zero of=/files0/swapfile bs=1024 count=4194304'''
# '''dd if=/dev/zero of=/files0/swapfile bs=1024 count=4194304'''
4194304+0 records in
4194304+0 records in
4194304+0 records out
4194304+0 records out
4294967296 bytes (4.3 GB) copied, 36.1759 seconds, 119 MB/s
4294967296 bytes (4.3 GB) copied, 36.1759 seconds, 119 MB/s
-
* Setup the swapfile.
+
* Setup the swap file.
# '''mkswap /files0/swapfile'''
# '''mkswap /files0/swapfile'''
Setting up swapspace version 1, size = 4294963 kB
Setting up swapspace version 1, size = 4294963 kB
* Enable the swapfile immediately.
* Enable the swapfile immediately.
-
# '''swapon /files0/swapfile'''
+
# '''swapon /files0/swap file'''
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* Enable the swapfile 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

Revision as of 20:50, 27 December 2007

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 swapfile immediately.
# swapon /files0/swap file
  • Enable the swap file after reboot.

Add the following to /etc/fstab:

/files0/swapfile        swap                    swap    defaults        0 0
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