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将节点内SSD容量调整为HDD容量

  • 2021年6月11日
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一个关于节点(在新的同构集群中)中SSD容量到HDD容量大小的问题。当指定节点中的驱动器空间时，每个节点的SSD与HDD的百分比至少是多少。有没有什么最佳实践指南可以给我指点?我不是问hdd的数量vs ssd的数量。

问题是容量，而不是数量或驱动器。例如，我配置了一个带有4TB SSD (2x1.92TB)和60TB HDD (10 x6tb)的节点，Nutanix Sizer认为这很好。这大概是6.25%的SSD，但是混合节点的SSD最小容量应该是6%，好吧，还是应该是10%或20%(或更多)?

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最佳答案伊万诺夫2021年6月11日10:45

Hi @tcourtney-72782<\/user-mention>\u00a0<\/p>

The problem there may possibly be with the performance of the cluster. It will greatly depend on what kind of workload you run there. If you want to run OLTP databases or any heavy IOPS workload with low latency expectations, it might be a good idea to size more SSD. If you plan to have a lot of cold data and latency is not that important, smaller SSD tier size will do. We generally recommend to never size the SSD tier below 10% of the total capacity, but overall the higher SSD ratio, the better performance you will get.<\/p>

You should also check your working set size and it should fit into the SSD tier. Check with the application owners how much new data\u00a0do their applications write per day. You can also check the incremental backup sizes. Incremental daily backups will have the data from the last day only, so it will provide some indication of how much new data is generated daily. Aim to make sure that the working set will fit into the 75% of the SSD tier and don\u2019t forget about the RF2\/RF3. And of course leave some free space for the future growth.<\/p>","className":"post__content__best_answer"}">

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Just a quick question about sizing SSD capacity to HDD capacity in a\u00a0node (in a new homogenous cluster). When specifying drive space in a node, what is the percentage SSD to HDD per node at a minimum. Is there a best practice guide that someone can point me towards? I\u2019m not asking about the number of HDDs vs the number of SSDs.<\/p>

The question is around capacity and not number or drives. e.g.\u00a0I configure a node with 4TB of\u00a0SSD (2x1.92TB) and 60TB\u00a0of HDD (10 x 6TB) and Nutanix Sizer says this is fine. This is roughly 6.25% SSD But what should I have as a minimum SSD capacity of of a hybrid node is 6% Okay, or should it be more like\u00a010% or 20% (or more)?<\/p>","quoteUsername":"tcourtney-72782","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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伊万诺夫
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嗨 @tcourtney - 72782

这个问题可能与集群的性能有关。这在很大程度上取决于您在那里运行的工作负载。如果您希望运行OLTP数据库或任何高IOPS工作负载，并期望有较低的延迟，那么最好设置更多SSD的大小。如果您计划有大量的冷数据和延迟不是那么重要，较小的SSD层大小就可以了。我们通常建议不要将SSD层的大小调整到总容量的10%以下，但总体而言，SSD的比例越高，您将获得越好的性能。

您还应该检查工作集的大小，它应该适合SSD层。向应用程序所有者检查他们的应用程序每天写多少新数据。您也可以查看增量备份大小。每天的增量备份将只保留前一天的数据，因此它将提供每天生成多少新数据的一些指示。目标是确保工作集适合75%的SSD层，不要忘记RF2/RF3。当然，这也为未来的发展留下了一些自由空间。

Sr. SRE | Nutanix全球支持| NSS #464, NCAP, VCP6.5-DCV, RHCSA, CCNA, EMCSA, AWS和谷歌云认证
Hi @tcourtney-72782<\/user-mention>\u00a0<\/p>

The problem there may possibly be with the performance of the cluster. It will greatly depend on what kind of workload you run there. If you want to run OLTP databases or any heavy IOPS workload with low latency expectations, it might be a good idea to size more SSD. If you plan to have a lot of cold data and latency is not that important, smaller SSD tier size will do. We generally recommend to never size the SSD tier below 10% of the total capacity, but overall the higher SSD ratio, the better performance you will get.<\/p>

You should also check your working set size and it should fit into the SSD tier. Check with the application owners how much new data\u00a0do their applications write per day. You can also check the incremental backup sizes. Incremental daily backups will have the data from the last day only, so it will provide some indication of how much new data is generated daily. Aim to make sure that the working set will fit into the 75% of the SSD tier and don\u2019t forget about the RF2\/RF3. And of course leave some free space for the future growth.<\/p>","quoteUsername":"Sergei Ivanov","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

年代

嘿 @tcourtney - 72782，

如果你某种类型的迁移从Hyper-V或ESXi，采取nutanix收集器检查你有多少工作数据。这个大小加上25%就是你的SSD层大小。

作为 @Sergei伊万诺夫提到的10%是绝对的最小值，我建议尺寸为20%。

亲切的问候,

拷边机

Hey @tcourtney-72782<\/user-mention>,<\/p>

if you some kind migrating from Hyper-V or ESXi, take nutanix collector to check how many working data you have. this size plus 25% is your SSD tier size.<\/p>

As @Sergei Ivanov<\/user-mention>\u00a0mentioned 10% is absolute minimum, i would recommend to size at 20%.<\/p>

\u00a0<\/p>

Kind regards,<\/p>

SergeR<\/p>","quoteUsername":"Serge R.","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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