As you probably know, a RAID disk controller is a system failsafe feature that allows for a disk in a disk array to fail without bringing the system down. Built into the RAID controller is a buffer. The buffer “tells” the processor that the “data write-to-disk” is complete, so the system “knows” to go back to the processor to fetch more data to send to the disks. Quite simply, the cache buffer speeds up data from the processor to the disk. And this cache buffer has a battery to keep … [Read more...]