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= 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. 

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== 2. Check our RAM size ==
{{{
$ top
Each node has 2G, we have 7 nodes. Total RAM size is 14G.
}}}
[[Image(krg_ram_top.png)]]

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== 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
}}}

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== 3. Check RAM status ==
{{{
$ df -h
}}}
[[Image(krg_ram_df.png)]]

{{{
$ mount | grep /home/ram
}}}
[[Image(krg_ram_mount.png)]]

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