On Wed, Apr 20, 2011 at 7:24 AM, David Brown <david@xxxxxxxxxxxxxxx> wrote: > Pros for hardware raid: > > + It can have battery backup (I don't have one at the moment - I have an > excellent UPS for the whole system). > + Rebuilds will be handled automatically by just adding new disks > + The card supports online resizing and reshaping > + It looks like the card supports caching with an SSD > + The card supports snapshots of the virtual drives Unless the card allows you to enable the write cache without the backup battery you will not see the real performance of the card. This option is normally locked out to prevent data loss in case the system crashes, power is pulled, etc. An external UPS will not protect in all cases if you enable the write back cache without battery. I have systems with both software raid and hardware raid. If the budget allows I tend to go the hardware raid route. When buying a Dell, HP, etc server with hardware raid you end up with a complete package. The enclosure, card, and server monitoring software make it easy to manage and visually see which drive has failed. Ryan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
