The overlay partition is where the access point stores configuration data and splash page image files. There is very limited storage space available on this partition. Typically there is less than 1 megabyte free. When the overlay partition fills up, the access point may not function correctly. Access points who's overlay partition is full will report into CloudTrax with a red exclamation point and the error "overlay partition is full".
Fixing a full overlay partition
Typically the cause of a full overlay partition is too many splash page image files, or files that are too large. In the past, CloudTrax never deleted images from the access point. Recent changes to CloudTrax and 6.4+ access point firmware allow unused images to be removed from CloudTrax and the access point upon saving your splash page.
If you haven't updated your splash page in awhile, or are running firmware older than 6.4, you may still have old images stuck on the access point or CloudTrax backend.
Try the following steps to clear out unused images on CloudTrax and the access point:
- Go to each SSID that has or had a splash page.
- Click "Edit Splash Page" to bring up the editor. You may need to temporarily enable the splash page feature to see this option.
- Save Changes within the editor and then close it. Anytime you save changes, the editor will analyze the splash page and delete unused images that were previously stored on the CloudTrax backend.
- Perform a pinhole reset on the access point.
Preventing a full overlay partition
As noted above, most of the time this issue is due to overly large image files. It is important that you resize the dimensions of your splash page images and compress them properly.
Your images should be approximately the dimensions you want this displayed on the splash page. If you're finding that you have to resize the images within the splash page editor, they are probably too large, and should be resized in an image editor to be smaller.
You should use JPEG or GIF compression. Do not use 100% Quality JPEG compression, try 70 - 85% to ensure the files are compressed sufficiently.