I was doing some advanced planning for storage, and it came to me that there might be benefit from thinking outside the box on RAID config. Therefore I offer this for comment. The object is reliability with performance. The means is to set up two arrays on physical devices, one RAID-0 for performance, one RAID-6 for reliability. Let's call them four and seven drives for the RAID-0 and RAID-6+Spare. Then configure RAID-1 over the two arrays, marking the RAID-6 as write-mostly. The intension is that under heavy load the RAID-6 would have a lot of head motion going on writing two parity blocks for every one data write, while the RAID-0 would be doing as little work as possible for writes and would therefore have more ability to handle reads quickly. Just a thought experiment at the moment. -- bill davidsen <davidsen@xxxxxxx> CTO TMR Associates, Inc Doing interesting things with little computers since 1979 - 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
