[CentOS] sadc output to a circular file of given size?

> You could create one, use dd to create an empty file that is the
> size you want, format it with mke2fs and mount it via loopback

Would it automatically do the loop thing though?  i.e. overwrite the
oldest data in the file?

-- 
“Don't eat anything you've ever seen advertised on TV”
         - Michael Pollan, author of "In Defense of Food"