问题

Nutanix容错问题

  • 2019年12月16日
  • 2回答
  • 3532的浏览量
R
徽章

嗨,伙计们,

我有一个有四个节点的nutanix块。我指的是四个节点的集群。

超微型计算机NX30-60

我有一个关于容错的问题。目前它被设置为RF-2

每个节点有6块硬盘。4块硬盘，2块SSD硬盘

4 * 800 gb硬盘

2* 200gb悲伤

操作系统是AHV。

1)假设，如果一台主机完全故障，那么虚拟机将在另一台主机上重启，它将继续运行，没有任何问题。

2)如果一个硬盘故障(无论是HDD或SSD或同时)从第一个AHV，那么将没有影响。

3)如果两个主机(第一个AHV和第二个AHV)的两个磁盘同时故障(假设两个节点上都有一个HDD故障)，那么对集群中所有运行的虚拟机有什么影响?

4)如果两个磁盘失败从两个主机(AHV 1日和2日AHV)在不同时间即30分钟的差距(假设一个硬盘失败在6点第一个节点,另一个硬盘失败在上午6.30,第二节点),那么将影响集群中的所有正在运行的虚拟机吗?

有人能给点建议吗?

谢谢你！

Manivel RR

    Hi Guys,<\/p>

    I have a nutanix block with four nodes. I mean four node cluster.\u00a0<\/p>

    Supermicro NX30-60<\/p>

    I have a query about fault tolerance. Currently it is set as RF-2<\/p>

    Each node\u00a0 has 6 disks. 4 hdd and 2 SSD<\/p>

    4*800 gb hdd<\/p>

    2* 200 gb sad<\/p>

    OS is AHV.\u00a0<\/p>

    1) Assume, if one host completely fails, then the vm will be restarted on other host and it will continue to run without any issues.\u00a0<\/p>

    2) If one disk fails(either HDD or SSD or both at the same time)from first AHV, then there will be no impact.\u00a0<\/p>

    3) If two disk fails from two hosts(1st\u00a0 AHV and 2nd AHV) at the same time(assume one HDD fails on both the nodes), then what will be the impact for all the running vms in the cluster?\u00a0<\/p>

    4) If two disk fails from two hosts(1st\u00a0 AHV and 2nd AHV) in different time I. E 30 mins gap(assume one HDD failed in 6AM in first node and another HDD failed at 6.30 AM in second node), then what will be the impact for all the running vms in the cluster?\u00a0<\/p>

    \u00a0<\/p>

    Could someone please advise?\u00a0<\/p>

    \u00a0<\/p>

    Thank you,\u00a0<\/p>

    Manivel RR<\/p>

    \u00a0<\/p>

    \u00a0<\/p>

    \u00a0<\/p>

    \u00a0<\/p>","quoteUsername":"Rajamanivel","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

    2回答

    米
    排名
    Userlevel 3
    徽章 ＋４

    嗨 @Rajamanivel

    1. 是—虚拟机HA，集群可用容量(cpu+ram)。
    2. 单磁盘故障:Nutanix AOS主动监控磁盘，甚至在实际磁盘故障之前就会发出警报(在大多数情况下)。例如，如果磁盘接近寿命或读写OP在几毫秒内没有响应- AOS将标记磁盘坏，你将看到ncc警报，无论是磁盘或负责数据管理的组件。数据的第二份副本将驻留在集群中另一个节点的另一个磁盘上．影响将为零。你可以阅读更多关于"数据通路弹性在nutanixbible.com上。还要注意的是，由于Nutanix不使用RAID—因此AOS只会重建实际的数据量，而不会重建磁盘的大小。

    3、4:

    双盘故障:

    当复制因子= 2时，每个数据块有两个副本。此外，使用4TB磁盘(仅使用1TB)，我们将在整个集群中拥有1TB的块/数据（更短的重建时间，因为我们考虑了使用的容量)-加上AOS主动磁盘警报，所以，除非两个磁盘同时被拉出，否则两个驱动器同时故障是非常罕见的。

    如果发生这种情况，那就取决于这两个磁盘上有多少块是相同的。可能会影响相关的虚拟机。对于关键的vm，您总是可以使用Replication Factor=3的独立容器，这将确保在集群中分布3个数据副本。

    如果不同主机上的两个驱动器在30分钟内出现故障，您还需要考虑这些驱动器上已使用的容量，但重建将立即触发。

    在磁盘故障的情况下，管理员扫描(MapReduce框架)将立即发生。它将扫描元数据(Cassandra)，以找到之前托管在故障磁盘上的数据和托管副本的节点/磁盘。

    一旦它发现需要“重新复制”的数据，它就会将复制任务分发到整个集群的节点上。

    在此过程中，启动坏盘的DST (Drive Self Test)测试，并监控SMART日志中的错误。

    数据通路弹性在nutanixbible.com将会解释更多关于nutanix如何保护数据和元数据。

    你也可以阅读下面的帖子获取更多信息:
    https://next.nutanix.com/how-it-works-22/disk-fault-tollerance-8822

    希望有帮助，已经尝试回答你的观点，请随时讨论进一步明确-谢谢

    BR

    Hi\u00a0@Rajamanivel<\/user-mention>\u00a0<\/p>
    1. Yes - provided HA is enabled for that VM and cluster capacity available (cpu+ram)<\/li>
    2. Single Disk failure : Nutanix AOS pro-actively monitors disk and will alert even before the actual disk failure (in majority of cases). so for e.g. if a disk is nearing it\u2019s life or a read or write OP is not responded within a few milliseconds\u00a0- AOS will mark the disk bad and you will see ncc alerts for either the disk or for the component responsible for data management. Second copy of your data will be hosted on another disk in another node in the cluster<\/strong>. Impact will be none. You can read more about \u201cData Path Resiliency<\/a>\u201d at the nutanixbible.com. Also note, that as Nutanix doesn\u2019t uses RAID - so AOS will only rebuild the actual amount of data and not the size of the disk.\u00a0<\/li> <\/ol>

      \u00a0<\/p>

      3 & 4 :<\/p>

      Dual Disk Failures :<\/p>

      with Replication Factor = 2, we have two copies of each data block.\u00a0Also, with a 4TB Disk which is only 1TB utilised, we will have 1TB worth of blocks\/data across the cluster<\/strong>\u00a0(shorter rebuild times as we factor in the capacity utilised<\/strong>)- \u00a0plus with AOS proactive disk alerting, so, unless two disks are pulled at the same time, this can be a very rare occurrence of two drives failing at the same time.<\/p>

      Now, if that were to happen, then it will depend as to how many blocks were identical on these two disks. that could impact the VMs in question. You can always have a separate container with Replication Factor=3 for critical VMs, that will ensure you have 3 copies of data spread out across the cluster.<\/strong><\/p>

      If the two drives on different hosts fails within (as per your e.g. 30 Minutes), you will need to factor in the capacity utilised on these drives as well, but the rebuild will be triggered immediately.<\/p>

      In the event of a disk failure, a Curator scan (MapReduce Framework) will occur immediately. \u00a0It will scan the metadata (Cassandra) to find the data previously hosted on the failed disk and the nodes \/ disks hosting the replicas.<\/p>

      Once it has found that data that needs to be \u201cre-replicated\u201d, it will distribute the replication tasks to the nodes throughout the cluster.\u00a0<\/p>

      During this process a Drive Self Test (DST) is started for the bad disk and SMART logs are monitored for errors.<\/p>

      Data Path Resiliency<\/a>\u00a0at the nutanixbible.com will explain a bit more on how nutanix protects data and metadata.<\/p>

      You can also read the following thread for some more info:
      https:\/\/next.nutanix.com\/how-it-works-22\/disk-fault-tollerance-8822<\/a><\/p>

      Hope that helps, have tried to answer your points, please feel free to discuss for further clarity - Thanks<\/strong><\/p>

      \u00a0<\/p>

      BR<\/p>","quoteUsername":"Mutahir","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

    R
    徽章

    感谢BR的及时回复。感谢。

    谢谢,

    Manivel RR

    Thanks BR for your prompt response.Much appreciated.<\/p>

    \u00a0<\/p>

    \u00a0<\/p>

    Thanks,<\/p>

    Manivel RR<\/p>

    \u00a0<\/p>","quoteUsername":"Rajamanivel","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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