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Forum Discussion
Raid5 Failures HDD MTBF XRaid2 Raid6 Dual Redundancy
Why Raid5(Single Redundancy) is not enough and why Raid6(Dual Redundancy) is better. I was reading this with interest some time ago ..http://www.usenix.org/events/fast07/tech/schroeder/schroeder_ht...
What I am saying is that when I read all the white papers out there in regards to the failure of RAID5 rebuilds you should reconsider using X-Raid2.
The chart was used to show the difference between Raid5 and Raid6 and if you ready the whitepaper then you will see that the results in reality are probably worse as the paper was written in regard to using enterprise grade drives and not the normal consumer HDD. Enterprise HDD have far higher reliability, some in the order of <1 in 10^16 Non-recoverable read errors per bits read but most SATA drives are 2 orders of magnitude less <1 in 10^14. So its a good enough graph to peek some interest into moving to X-Raid2.
I have had every RAID5 automatic rebuild fail briefly at some point. They have been recoverable but alas they have all failed to automatically rebuild. This is not good news for the average consumer that plugs in and forgets. Its all about education and migration from Raid5 to Raid6 needs to start soon due to the size of HDD's now reaching 4TB.
For me, one time only by doing multiple restarts of the NAS resulted in success, but not normally. So far, touch wood. I have had no problems with RAID6 aka X-Raid2 rebuilds in the ReadyNASPro.
I believe this is due to the double distributed parity and block level striping which help to prevent the bad old days of a single hot drive while rebuilding the array which Im sure contributed to melt down, maybe if my drives had RVS or better thermal compensation it might not have been a problem.
The chart was used to show the difference between Raid5 and Raid6 and if you ready the whitepaper then you will see that the results in reality are probably worse as the paper was written in regard to using enterprise grade drives and not the normal consumer HDD. Enterprise HDD have far higher reliability, some in the order of <1 in 10^16 Non-recoverable read errors per bits read but most SATA drives are 2 orders of magnitude less <1 in 10^14. So its a good enough graph to peek some interest into moving to X-Raid2.
I have had every RAID5 automatic rebuild fail briefly at some point. They have been recoverable but alas they have all failed to automatically rebuild. This is not good news for the average consumer that plugs in and forgets. Its all about education and migration from Raid5 to Raid6 needs to start soon due to the size of HDD's now reaching 4TB.
For me, one time only by doing multiple restarts of the NAS resulted in success, but not normally. So far, touch wood. I have had no problems with RAID6 aka X-Raid2 rebuilds in the ReadyNASPro.
I believe this is due to the double distributed parity and block level striping which help to prevent the bad old days of a single hot drive while rebuilding the array which Im sure contributed to melt down, maybe if my drives had RVS or better thermal compensation it might not have been a problem.
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