- if you re using rsync there is the flag
--drop-cache
according to this question - the nocache utility which
minimize the effect an application has on the Linux file system cache
Use case: backup processes that should not interfere with the present state of the cache.
- using dd there is direct I/O to bybass cache according to this question
- the dd also has the option
nocache
option check the commandinfo coreutils 'dd invocation'
for details