Red Hat / Fedora :: Cannot Write To Ramdisk - No Space Left On Device?

I am trying to write to a Ramdisk because I suffer from terrible IO speeds on my VPS. It uses openVZ and I run a Centos 5 distro.

So i created my ramdisk with '/bin/mount -t tmpfs -o size=1G,nr_inodes=10k,mode=0775,noatime,nodiratime tmpfs /tmp'

but whenever I try and copy files to it, it just spams me with 'no space left on device even though there is!

Here is the output of df:

/dev/simfs 157286400 6511452 150774948 5% /
none 16441412 4 16441408 1% /dev
tmpfs 5242880 1296 5241584 1% /disk/test
tmpfs 5242880 1296 5241584 1% /disk/test

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