Linux Mint - Free and powerful

Monday, 13 January 2014

2. Creating a Linux Mint Power Server - Memory and Swap

Upgrading the memory and or swap file

In case you are using a pathetic I-B-M foundation server you will find that 2 GB of memory is not enough. Also, if you did a default install you will only have a swap file of 2 GB. In my case I had a faulty 1 GB stick that left me with only 1 GB.

While waiting for some memory to arrive from ebay I decided to create two swap files on two separate disks to temporarily increase the memory capacity. Apparently the kernel will load balance between the two files. (this is of course overkill and pretty pointless but nevertheless it was good to test the mechanism)

Create the swap files

dd if=/dev/zero of=/swapfile1 bs=1024 count=10485760
dd if=/dev/zero of=/mnt/ADD-DOMINO/swapfile2 bs=1024 count=10485760

# Check the directory listing to see if you have files name

Issue the mkswap command

mkswap /swapfile1
mkswap /mnt/ADD-DOMINO/swapfile2

Edit fstab

gedit /etc/fstab &

/swapfile1                 none    swap    sw      0       0
/mnt/ADD-DOMINO/swapfile2  none    swap    sw      0       0 inhere

Switch on the swap file

swapon /swapfile1
swapon /mnt/ADD-DOMINO/swapfile2

Set the swappiness

echo 20 > /proc/sys/vm/swappiness

echo 90 > /proc/sys/vm/swappiness

To make this permanent.

Edit - /etc/sysctl.conf and adjust vm.swappiness

After my real memory upgrade

I reinstalled this server so the default installer created the swap partition. 


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