HWraid for GNU/Linux

Setting cache on RAID controller

Real RAID controllers (not those found onboard of mainboards) normally have a battery backed cache (or an ultracapacitor + flash memory "zero maintenance cache") which is used for buffering writes to improve speed. Even if it's battery backed, the individual hard disk write caches need to be turned off, as they are not protected from a powerfail and will just lose all contents in that case.

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