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Take this opportunity to invest in your career and grow your skill set.\u00a0<\/span><\/p>
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Thanks for waiting to everyone who got our sneak peek of this last week!\u00a0\ud83d\ude09<\/p>
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Terms and Conditions<\/strong><\/em><\/p>
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The exam voucher will be provided to you after you have completed the course. Self-paced online student\u2019s vouchers will be assigned through the Learning Plan within 24-hours after the completion of the course.<\/span><\/em><\/p>\t<\/li>\t
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You must complete the course between June 14, 2022 and August 16, 2022.\u00a0<\/span><\/em><\/p>\t<\/li>\t
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For online students, your exam voucher must be redeemed by 8\/23\/22. For instructor-led students, your exam voucher must be redeemed 6 months after you complete the course.\u00a0<\/span><\/em><\/p>\t<\/li>\t
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The exam voucher code can only be used once.<\/span><\/em><\/p>\t<\/li>\t
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You will receive one (1) NCP exam voucher for each class completed. The voucher can be used on any NCP exam.\u00a0\u00a0<\/span><\/em><\/p>\t<\/li><\/ul>
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工作负载和应用程序

服务器虚拟化

确定订阅中CPU的适当方法

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确定订阅中CPU的适当方法

1年前
2021年2月2日

3个答复

1235意见

m

马文布

冒险家

4个答复

我们是Nutanix的新手。我们正在从ESXI迁移到AHV。目前，我们在ESXI上有一定程度的CPU超额认购。我们预计有必要在某些群集上超额订阅CPU，我正在寻找安全执行此操作的方法。我看了《最佳实践指南》，但那里很少。任何帮助，将不胜感激。

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最好的答案谢尔盖·伊万诺夫（Sergei Ivanov）2021年2月3日，16：25

There is no difference for the AHV hypervisor whether it\u2019s vCPUs or cores per vCPU in the VM config.<\/p>
We always recommend to use vCPUs first, so if you need a VM with 4 CPUs in total - just use 4 vCPUs and 1 core per vCPU. The only purpose of those settings is that some older guest operating systems have limitations in the amount of cores and\/or sockets, so for legacy OSs it might be useful. Also, some software is getting licensed by the amount of sockets, then it might be useful to use multiple cores per vCPU to get less sockets. For performance there is no difference.<\/p>
\u00a0<\/p>","className":"post__content__best_answer"}">
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中央处理器

AHV

We are new to Nutanix. We are migrating from ESXi to AHV.\u00a0 We currently have some level of CPU\u00a0oversubscription in place on ESXi.\u00a0 We anticipate the need to oversubscribe CPU\u00a0on some clusters and I am looking for ways to do this safely.\u00a0 I\u2019ve looked in the Best practices guide but there was very little there.\u00a0 Any help would be appreciated.<\/p>","quoteUsername":"MarvinB","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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谢尔盖·伊万诺夫（Sergei Ivanov）

Nutanix员工

101回复

1年前
2021年2月2日

嗨，马文，

如果您正在从ESXI迁移到AHV，则可以使用与ESXI上的类似CPU超额标准。如果您是从非Nutanix迁移的，请不要忘记在Nutanix上，每个主机上也有CVM，有时可以利用CPU资源的大部分，必须考虑它们。

通常，如果您目前在ESXI上有3：1的比率，并且在那里没有问题，那么您很可能在AHV上也没有3：1的比率。

通常，物理与虚拟核心比率没有经验法则。这在很大程度上取决于您的工作量以及您运行的应用程序。例如，对于SAP HANA或非常重的OLTP数据库，最好不要超额订阅。对于小数据库，某种超额检查可以是可以的，对于VDI来说，它可能更高。如果运行特定的工作负载，例如SQL，Oracle等，您可以在门户网站上查看我们的最佳实践 -https://portal.nutanix.com/page/documents/solutions/list。

总的来说，我会说：

1：1的比率可用于任务关键工作负载，以确保在需要时访问VM

1：1-3：1可以用于通用工作负载

3：1-5：1可以用于VDI或通用工作量，但CPU的争论可能取决于VM的忙碌程度

5：1及更高 - 随着时间表开销的增加，明显的性能影响的机会会增加

但是通常不要将其视为。这只是基于平均工作量的粗略估计。

高级SRE |Nutanix全球支持|NSS＃464，NCAP，VCP6.5-DCV，RHCSA，CCNA，EMCSA，AWS和Google Cloud认证

Hi MarvinB,<\/p>
if you are migrating from ESXi to AHV you can use similar CPU oversubscription as on ESXi. If you are migrating from non-Nutanix, just do not forget that on Nutanix there are also CVMs on each host that can sometimes utilise quite some part of the CPU resources and they have to be taken into account.\u00a0\u00a0<\/p>
Typically, if you currently have for example 3:1 ratio on ESXi and you have no problems there, you most likely also will have no problems with 3:1 ratio on AHV.<\/p>
In general, there is no rule of thumb for the physical-to-virtual cores ratio. It depends a lot on your workload and what kind of applications you run. For example, for SAP HANA or very heavy OLTP databases it might be better to not oversubscribe at all. For small databases some kind of oversubscription can be ok and for VDI it can be much higher. If you run specific workloads, such as for example\u00a0SQL, Oracle, etc, you can check our best practices for those solutions on the portal -\u00a0https:\/\/portal.nutanix.com\/page\/documents\/solutions\/list<\/a>.\u00a0<\/p>
In general, i would say:<\/p>
1:1 ratio can be used for mission critical workload to guarantee VM access to CPU when needed<\/li>\t
1:1-3:1\u00a0can be used for the general purpose workload<\/li>\t
3:1-5:1\u00a0can be used for VDI or general purpose workload, but CPU contention is possible depending on how busy the VMs are<\/li>\t
5:1\u00a0and higher - chance of noticeable performance impact increases as the scheduling overhead gets higher<\/li><\/ul>
But don\u2019t take it as a rule. It is just a rough estimation based on average workloads.<\/p>","quoteUsername":"Sergei Ivanov","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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m

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冒险家

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1年前
2021年2月3日

这很有帮助。一项跟进是，是否有任何最佳方法来设置VCPU/核心来帮助这一点。就超额认证而言，如果我们设置了一个4个带有一个核心的VCPU，2个带有2个核心的VCPU或1个带有4个核心的VCPU，这会有所作为。

That is very helpful.\u00a0 One follow up, is there any optimal way to set up vCPUS\/cores to help with this.\u00a0 Just with respect to oversubscription, would it make an difference if we had a 4 CPU\u00a0system set up as 4 vCPUS with one core, 2 vCPUs with\u00a02 cores, or 1 vCPU with 4 cores.<\/p>","quoteUsername":"MarvinB","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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谢尔盖·伊万诺夫（Sergei Ivanov）

Nutanix员工

101回复

1年前
2021年2月3日

回答

AHV管理程序在VM配置中是AHV管理程序没有区别。

我们始终建议您先使用VCPU，因此，如果您需要总共4个CPU的VM，则只需使用4个VCPU和1个核心。这些设置的唯一目的是，一些较旧的访客操作系统在核心和/或插座的数量上存在限制，因此对于Legacy OSS来说，它可能很有用。此外，某些软件正在获得插座量的许可，因此使用每个VCPU多个内核来获得更少的插座可能很有用。对于性能，没有区别。

高级SRE |Nutanix全球支持|NSS＃464，NCAP，VCP6.5-DCV，RHCSA，CCNA，EMCSA，AWS和Google Cloud认证

There is no difference for the AHV hypervisor whether it\u2019s vCPUs or cores per vCPU in the VM config.<\/p>
We always recommend to use vCPUs first, so if you need a VM with 4 CPUs in total - just use 4 vCPUs and 1 core per vCPU. The only purpose of those settings is that some older guest operating systems have limitations in the amount of cores and\/or sockets, so for legacy OSs it might be useful. Also, some software is getting licensed by the amount of sockets, then it might be useful to use multiple cores per vCPU to get less sockets. For performance there is no difference.<\/p>
\u00a0<\/p>","quoteUsername":"Sergei Ivanov","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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