Use RAM in Kerrighed (tmpfs)

1. Introduction

Because Kerrighed can merge all client RAM (like shared memory architecture). So we can use partial RAM to be a fast disk. In this article, we utilize tmpfs to accomplish it.

2. Check our RAM size

$ top
Each node has 2G, we have 7 nodes. Total RAM size is 14G.

2. Use RAM in Kerrighed

We use 7g RAM to be a disk.

$ mount tmpfs /home/ram 0t tmpfs -o size=7g
$ dd if=/dev/zero of=/home/ram/tmp_3g.img   bs=1m count=3000
$ dd if=/dev/zero of=/home/ram/tmp_3g.img2  bs=1m count=3000

3. Check RAM status

$ df -h

$ mount | grep /home/ram