July 16, 20169 yr Please consider adding nocache. Nocache is available in Ubuntu and several other distros. It allows you to prefix any command with "nocache" and that command will run with minimal impact on existing cache status. For example when preclearing a disk, running backups, dd-ing a disk to an image file, text searches across large filesystem trees, etc., that will involve a lot more data than RAM, would simply churn the cache so actual useful cache contents will get lost (such as cached directory structures).
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