ну например
https://www.kernel.org/doc/Documentation/block/queue-sysfs.txt write_cache (RW)
----------------
When read, this file will display whether the device has write back
caching enabled or not. It will return "write back" for the former
case, and "write through" for the latter. Writing to this file can
change the kernels view of the device, but it doesn't alter the
device state. This means that it might not be safe to toggle the
setting from "write back" to "write through", since that will also
eliminate cache flushes issued by the kernel.