blocks|key|5732392|text|使用RAID6。阅读罗宾·哈里斯(+Robin+)的““为什么RAID+6在2019年停止工作””(+ZDNet+)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|entityMap|0|LINK|mutability|MUTABLE|url|http://www.zdnet.com/blog/storage/why-raid-6-stops-working-in-2019/805^0|R|L|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@$A|L|B|M|1|N]]|C|$]]]|D|$E|$5|F|G|H|C|$I|J]]]]

Use RAID6. Read <a href="http://www.zdnet.com/blog/storage/why-raid-6-stops-working-in-2019/805" rel="noreferrer">"Why RAID 6 stops working in 2019"</a> by Robin Harris on ZDNet.

blocks|key|5732612|text|RAID+5不应与热备用(热备用)一起存在。RAID+6总是更好地使用相同的驱动器计数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5732613|http://www.smbitjournal.com/2012/07/hot-spare-or-a-hot-mess/|offset|length|5732614|RAID+5解决方案没有空间/容量优势或成本优势(但一些小的性能优势)，但它对于减少URE风险有很大帮助。|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1O|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|G|5|6|7|S|8|@]|9|@]|A|$]]]|H|$I|$5|J|K|L|A|$M|C]]]]

RAID 5 should never exist with a hot spare (warm spare.) RAID 6 is always a better use of the same drive count. 

<a href="http://www.smbitjournal.com/2012/07/hot-spare-or-a-hot-mess/" rel="noreferrer">http://www.smbitjournal.com/2012/07/hot-spare-or-a-hot-mess/</a>

There is no space/capacity advantage or cost advantage to the RAID 5 solution (but some small performance advantage) but it does a ton for mitigating things like URE risk.

blocks|key|3733793|text|这一个很容易--你想要更多可用的磁盘空间还是能够生存磁盘失败--就这么简单。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3733794|所以我要做一些疯狂的假设--你不关心性能，因为它们是7.2's，你关心的是可用空间，因为它们是1TB磁盘--你没有提到你想存储什么类型的数据，但我假设它要么只是视频文件，要么是视频和音频的组合。如果我是对的，那么你大概会很难替换这些数据吧？在这种情况下，我不会选择5或6，但是使用R10，是的，您在R6上丢失1TB，在R5上丢失2TB，但是它会更快，并且可以保存三个磁盘。如果我错了，而且您可以快速恢复您的数据，那么您可以使用R5，这样您就可以获得最可用的空间。|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|F|8|@]|9|@]|A|$]]]|D|$]]

This one's easy - do you want more available disk space or the ability to survive disks failing - it's that simple.

So I'll make some wild assumptions - that you don't care about performance as they're 7.2's and that you do care about available space as they're 1TB disks - you don't mention what type of data you want to store but I'm going to assume it's either just video files or a combination of video and audio. If I'm right then presumably you would struggle to replace the data? in that case I'd choose neither 5 or 6 but go with R10, yes you lose 1TB over R6 and 2TB over R5 but it'll be faster and can survive three disks going pop. If I'm wrong and you can quickly recover your data then you may as well go R5 so you get the most available space.

blocks|key|3734042|text|虽然性能是一个关注点，但它并不像你想象的那么令人关注。较新的RAID硬件将以同样快的速度编写2条奇偶条，就像它们在1条上一样。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3734043|另外，SAS驱动器通常具有较低的误码率，这将导致较低的不可恢复读取错误(URE)。通常是数量级(10倍)，然而，如果SAS驱动器是相同的模型与SATA驱动器，您可能看不到改善。|3734044|最后，关于RAID-5和UREs的问题，以及它如何会毁了你的一天，我不久前在：http://subnetmask255x4.wordpress.com/2008/10/28/sata-unrecoverable-errors-and-how-that-impacts-raid/上写了一篇文章，其中我介绍了其中的一些问题。基本上，RAID-6在好的硬件(而不是软件RAID)上应该显示出与RAID-5同等的性能.如果您的硬件很差，或者正在使用软件RAID，那么您将看到性能受到影响。|offset|length|3734045|一如既往，备份是您的储蓄恩典。不要忘记实现备份策略，并验证是否可以从中恢复备份策略。|entityMap|0|LINK|mutability|MUTABLE|url|http://subnetmask255x4.wordpress.com/2008/10/28/sata-unrecoverable-errors-and-how-that-impacts-raid/^0|0|0|13|2S|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@$F|T|G|U|1|V]]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

While performance is a concern, it is not as much of a concern as you think. Newer RAID hardware is going to be as fast writing 2 parity stripes as they are at 1 stripe.

Also, SAS drives usually have a lower Bit Error Rate, which translates to a lower Unrecoverable Read Error (URE). Usually an order of magnitude (10x), however, if the SAS drive is the same model as a SATA drive, you may not see an improvement.

Finally, as to the question of RAID-5 and UREs and how that can just ruin your day, I wrote an article on it some time ago at:
<a href="http://subnetmask255x4.wordpress.com/2008/10/28/sata-unrecoverable-errors-and-how-that-impacts-raid/" rel="nofollow noreferrer">http://subnetmask255x4.wordpress.com/2008/10/28/sata-unrecoverable-errors-and-how-that-impacts-raid/</a>
in which I cover some of these questions. Basically, RAID-6 on good hardware (not software RAID) should show equivalent performance to RAID-5. If you have poor hardware, or are using software RAID, then you will see a performance hit.

As always, backups are your saving grace. Do not forget to implement a backup policy, AND verify that it can be recovered from.

blocks|key|3733719|text|RAID6。这样，如果两个磁盘连续发生相对较快的故障，那么数组还没有从第一个故障中完成重建(或者两个磁盘在停电后无法旋转)，您还没有丢失所有的数据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

RAID6. That way, if a two disks fail in relatively quick succession, so the array hasn't finished rebuilding from the first failure (or 2 disks fail to spin up after a power outage), you've not lost all your data.

blocks|key|5732475|text|这里有很多好建议，特别是来自巴特和Chopper3的建议。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5732476|我要添加的唯一一件事是在失败情况下测试工作负载。人们通常设置RAID-5/RAID-6来购买可用性(即。服务器不会因为磁盘故障而停机)。不幸的是，对于一些工作负载--尤其是大量编写的工作负载--您可能会发现性能受到的影响非常严重，因此您不会购买太多。|5732477|如果你的测试成功了，很好--别忘了设计和测试备份策略。|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|H|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|I|8|@]|9|@]|A|$]]]|F|$]]

Lots of good advice here, particularly from Bart and Chopper3. 

The only thing that I would add is test your workload under a failure condition. People usually setup a RAID-5/RAID-6 to buy availability (ie. the server isn't going down due to disk failure). Unfortunately, for some workloads -- especially write-heavy workloads, you may find that the performance hit is severe enough that you aren't buying much.

If your testing works out, great -- just don't forget to devise and test a backup strategy.

blocks|key|5732190|text|我认为RAID+5比6(和10)取决于性能，以及您对使用的驱动器的品牌(S)的信任程度。我们主要使用HP服务器和HP存储，并且很少有磁盘故障，所以我很高兴在不太关键的系统上使用RAID5%2Bhotspare，甚至RAID5。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5732191|理论上，当重建第一个失败的驱动器时，RAID6可以将您从第二个驱动器故障中拯救出来，但是您可以将其与生成两个不同的奇偶校验条所需的计算量进行比较。我们没有使用6，所以我从来没有看过任何关于RAID6数组重建速度与RAID5之间的关系的规范，但是我认为6需要更长的时间，因为它需要进行2次奇偶计算，而不仅仅是一次。|5732192|如果我要离开RAID5，我可能会用10+(或01)来完全避开奇偶计算。有了6个驱动器，你就可以做到这一点，尽管你的净容量只有一半。|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|H|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|I|8|@]|9|@]|A|$]]]|F|$]]

I think RAID 5 vs. 6 (and vs. 10) comes down to performance and how much you trust the brand(s) of drives you use. We primarily use HP servers and HP storage and have had very few disk failures, so I'm happy with RAID5+hotspare or even just RAID5 on less critical systems.

In theory, RAID6 saves you from a second drive failure while a first failed drive is being rebuilt, but you trade that off against the increased computations needed to generate 2 different parity stripes. We haven't used 6, so I've never looked at any specs on just how fast a RAID6 array can be rebuilt vs. RAID5, but I assume 6 will take longer since it has to do 2 parity calculations, not just one.

If I were going to move away from RAID5, I'd probably go with 10 (or 01) to get away from parity calculations altogether. With 6 drives, you could do that, although you net only half the capacity.

blocks|key|5732272|text|Raid6有更多的开销，因此在相同数量的驱动器上，raid5本身会更快。另一方面，当磁盘死掉和rai5重新构建时，您可能会失去这个优势，如果另一个驱动器在重新构建过程中死掉，您将面临丢失数组的风险。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5732273|在您的例子中，您在不同数量的纺锤体上运行raid5+vs+6，因此由于额外的纺锤体raid6可能更快。|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|F|8|@]|9|@]|A|$]]]|D|$]]

Raid6 has more overhead, so raid5 as such will be faster on the same amount of drives. On the other hand you might lose the advantage once a disk dies, and the rai5 rebuilds, you are at risk of losing the array if another drives dies during the rebuild.

In your case, you're running raid5 vs 6 on a different amount of spindles, so because of the extra spindle raid6 might be faster.

blocks|key|3733954|text|好的答案，除了没有人提到写性能。与RAID+5相比，RAID+6通常会使您在写时受到轻微的性能影响，因为有两个奇偶校验条需要维护。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3733955|尽管如此，大多数人还是觉得使用RAID+6是值得的。|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|F|8|@]|9|@]|A|$]]]|D|$]]

Good answers, except that no-one has mentioned write performance. RAID 6 usually gets you a slight performance hit on write compared to RAID 5, since there are two parity stripes to be maintained.

Nonetheless, most find it worthwhile to go with RAID 6.

Just curious, I have 6 x 1TB 7200RPM Near Line SAS for my new server. I can either configure it as RAID5+1 Hot Spare or RAID6. 

What should I choose?

Which is better: RAID5 + 1 Hotspare / RAID6?

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没有提供实际的解决方法或示例。

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只是好奇，我有6x1TB 7200 new线附近的SAS为我的新服务器。我可以将其配置为RAID5+1热备用或RAID6。我该选什么？

问哪个更好: RAID5 +1 Hotspare / RAID6？
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问哪个更好: RAID5 +1 Hotspare / RAID6？
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