On Fri, 18 Jan 2013, Stan Hoeppner wrote:
The probability of a URE during rebuild increases with the number and size of the source drives being read to rebuild the failed drive. Thus the probability of encountering a URE in the 1:1 drive scenario is extremely low, close to zero if you believe manufacturer specs.
For a 2TB drive and BER 10^-14 (common for non-enterprise drives), the probability is 1/6 of a single URE for a read of the entire drive.
So, no, the "URE scare" being propagated these days doesn't affect RAID1/10. If/when individual drive capacities exceed 10TB in the future, and if at that time the URE rates per drive do not improve, -then- this phenomenon will affect RAID1/10. But it does not currently with today's drives.
Let's agree to disagree. -- Mikael Abrahamsson email: swmike@xxxxxxxxx -- 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
