> What is the effect of toggling the disk drive's write-caching feature
Turning off write caches of disks and the RAID controller slows writing
badly. Examples of a recent HP ML350 server with 3x 146GB 10k SAS disks:
- disk cache and RAID write cache OFF: 65MB/s
- disk cache and RAID write cache ON: 145MB/s
and that is on _sequential_ writes. We didn't measure _random_ writes, but
the system felt like an old 386 then. Really unusable.