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Three methods of redhat linux swap Partition extension

Swap introduction:

When the physical memory is used up, when the system needs more physical memory, the inactive pages in the physical memory is move to the swap space. Swap space is located on the hard disk, so access is slower than physical memory.

When the physical memory of the machine changes, the swap partition should be extended accordingly:

There are three ways to extend the swap partition:

Expand the logical volumes of the swap partition in use (recommended)

2. Create a new swap partition

3. Create a new swap file

The specific steps are as follows:

Expand the logical volumes of the swap partition in use

Set the logical volume used as the swap partition to: / dev/VolGroup00/LogVol01

Disable swapping for the associated logical volume:

# swapoff-v / dev/VolGroup00/LogVol01

Resize the LVM2 logical volume by 256 MB:

# lvm lvresize / dev/VolGroup00/LogVol01-L + 256m

Format the new swap space:

# mkswap / dev/VolGroup00/LogVol01

Enable the extended logical volume:

# swapon-va

Test that the logical volume has been extended properly:

# cat / proc/swaps or # free

2. Create a new swap partition

Set the logical volume of the newly created swap partition to: / dev/VolGroup00/LogVol02

Create the LVM2 logical volume of size 256 MB:

# lvm lvcreate VolGroup00-n LogVol02-L 256m

Format the new swap space:

# mkswap / dev/VolGroup00/LogVol02

Add the following entry to the / etc/fstab file:

/ dev/VolGroup00/LogVol02 swap swap defaults 00

Enable the extended logical volume:

# swapon-va

Test that the logical volume has been extended properly:

# cat / proc/swaps or # free

3. Create a new swapfile

To extend swap in this way, the first step is to calculate the number of block. Specifically, the size of the swapfile expanded as needed, in M units. Block=swap partition size * 1024. For example, if you need to extend 64m swapfile, then: block=64*1024=65536.

Then do the following steps:

Dd if=/dev/zero of=/swapfile bs=1024 count=65536

Setup the swap file with the command:

Mkswap / swapfile

To enable the swap file immediately but not automatically at boot time:

Swapon / swapfile

To enable it at boot time, edit / etc/fstab to include the following entry:

/ swapfile swap swap defaults 0 0

After adding the new swap file and enabling it, verify it is enabled by viewing the output of the command cat / proc/swaps or free.

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