Manage Swap Partition

SWAP Partition-

Linux uses the SWAP space configured on one or more hard drive partitions to store in
frequently used programs and data. SWAP space can extend the amount of effective RAM on your
Normally, Linux (on a 32bit Intelstyle
computer) can use a maximum 4GB of SWAP space in
partitions no larger than 2GB. This 4GB cab be spread over a maximum of eight partitions. The
typical rule of thumb suggests that SWAP space should be two times the amount of RAM.
1GB physical RAM = 2GB SWAP space

Two method of SWAP partition creating-

1. Fdisk utility
2. File method

# fdisk –l                (Check the partition)
/dev/sda1 à boot
/dev/sda2 à /
/dev/sda3 à Linux SWAP
/dev/sda4 à Extended partition

# fdisk /dev/sda         (Create a partition)

# partprobe /dev/sda or #partx –-a /dev/sda    (Update partition table)
# reboot
# mkswap –-L SWAP /dev/sda5               
# swapon /dev/sda5  or # swapon -–a

#vim /etc/fstab

LABEL=SWAPsda5 swap swap defaults 0 0


/dev/sda5 swap swap defaults 0 0

#mount –a

Check Swap Status-

Remove Swap Partition-
#swapoff /dev/sda5
Remove entry form “/etc/fstab”

Create SWAP space from file method,  First create a blank file-

# touch /swap
# dd if=/dev/zero of=/swap bs=1M count=100
# mkswap -–L SWAP /swap
# swapon /swap

# vim /etc/rc.local
Swapon /swap

Swap run time verify status

# cat /proc/swaps

/dev/sda3 partition 4194296 0 1 /swap file 102392 0 2

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