Dell Perc RAID cards (among others) allow you to set the disk cache policy to be either on (meaning, the individual hard disks use their built-in caches) or off (meaning, the individual disk caches are disabled). In reading discussions on the net, I find conflicting information about which setting is best. Some people say to disable the disk caches because a power failure can cause corruption of data; others say you can leave the disk caches enabled if your computer is connected to an uninterruptible power supply, and that enabling the caches improves disk performance even in RAID configurations.
Is there a definitive conclusion to which way the disk caches should be set?
Note that this is not about the RAID card's cache and caching policy – this is about the disks used in the array, not the card cache or the battery backup on the card itself.