Moving ffp to a USB stick

Ok, I finally got down to moving ffp to a cheap 1GB USB stick. The motivation for doing so are:

1. Power saving - When there are little to no activities in the box, I do not want the hard disks to spin up unnecessarily.
2. Clean HD_a2 file system - I still haven't figure out why cleanboot is not working on my box hence I rather risk a corrupted USB stick containing only ffp than my precious 500GB of real data.

Here are the steps I took to get it working on my box: [Edit: The instructions below is no longer valid for ffp 0.5 dated Aug 20th and later. Please look here for the latest instructions.]

1. Get a cheap 1GB USB stick and plug it into the USB port behind the device. (duh!)
2. Download the necessary module (i.e. usb-storage.ko) from here and put it in the folder /ffp/lib/modules/[kernel_version]/. Note that this is a new directory that you will need to create. (TIP: run 'uname -r' on the command line first to get the kernel version and then substitute it in the path above)
3. Test the compatibility of the USB stick by running the usb mounting script that came with the ffp v0.5 package.
1. Note: you may need to edit the script var usbdisk_dev if you have a second HDD as the default value is sdb1.
2. run the script using the command ". ./usbdisk.sh"
3. If everything is ok, you should see the message "Mounting /dev/sdc1 on /mnt/HD_a2/sdc1". You may also want to run df to confirm that it is properly mounted.
4. Now that you are sure your USB stick works in the DNS-323, its time to format the stick in ext2. To do this, unmount the stick and run "mke2fs /dev/sdc1".
5. Now, mount the new fs and copy the entire ffp folder to the stick. i.e. run "mount /dev/sdc1 /mnt/HD_a2/sdc1", followed by "cp -a /mnt/HD_a2/ffp /mnt/HD_a2/sdc1/".
6. When we get here, we are now ready to replace the stock fun_plug script with one that will run ffp from the USB stick. There are a couple of variants floating about in the forum. Personally, I like the one by SilentException best as it identifies the stick via its UUID hence making sure it grabs the right stick for our mount point even if you have multiple USB sticks attached to the box.
1. Backup your original fun_plug script. (This is always a good idea)
2. Grab the script from here and put it in the root directory of /mnt/HD_a2.
3. Locate your device's UUID by running the command blkid /dev/sdc1.
4. Copy the UUID and replace the value in the variable USB_DEV_UUID in the script.
5. You may also want to edit/remove the portion after #MS (but before # run commands!)
6. Reboot the box and when it comes back up, check the log /mnt/HD_a2/ffp.log to make sure that you are now running ffp off the USB stick instead of the HDD.

Note that for convenience, this script also defines the shortcuts /hd and /usb to refer to /mnt/HD_a2 and /mnt/USB respectively.