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解决了

Nutanix CVM统计

  • 2019年11月12日
  • 6个答复
  • 2011年观点

徽章

你好

我是Nutanix的新手,您能为我解释以下统计数据,以及它在VMS性能中的性能,在备份运行时我获得的高速缓存统计屏幕?

图标

最好的答案Sbarab2019年11月14日,20:39

@bas000m<\/user-mention>\u00a0 I thought I chime in.<\/p>

From the graphics you have in the above, I am guessing you mean \u201cRange cache hit %\u201d as oppose to \u201cContent cache hit rate\u201d. Correct me if I am wrong and I will try to explain about them here.\u00a0\u00a0\u00a0Most people have a \u201clow read\u201d hit rate for range cache as the work load is not predictive enough. So a 5% to 6% value may not be a bad number here\u00a0compare to a zero percent which indicates a total unpredictability.<\/p>

But for other hit rates in cache_stats like \u201cvdisk block map\u201d and \u201cextentgroupid\u201d map we want to have high hit ratio say\u00a090+% cause if we miss here it results in an on-disk look uo from cassandra (service that cans the cluster data), which is much slower.\u00a0\u00a0I don\u2019t go any further than this in here but just wanted to show that there is a difference between each of the hit rates indicated in page 2009 under \u201ccache_stats\u201d<\/p>

So I did some research\u00a0and here is what I have found. The \u201dContent Cache Hit Rate (%) as presented in \u201cAnalysis\u201d page in prism is really a combination of what \u201ccache_stats\u201d\u00a0\u00a0show in the page 2009 of the cluster.\u00a0 As it is now, it perhaps is not the best measure of assessing performance in cluster as each of the parameters show a specific information and adding them up may not translate well about cluster perfromance overall. That will be changed in the future so people can pick the exact parameter they want among the cache_stats.<\/p>

\u00a0<\/p>

Hope this shed some more light on your concern.<\/p>","className":"post__content__best_answer"}">

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6个答复

徽章

还有我更改的统计信息,

UserLevel 4
徽章 +5

你好 @bas000m

以下文档可能会帮助您了解性能指标

https://portal.nutanix.com/#/page/docs/details?targetId=prism-central-central-guide-prism-v511:mul-performance-management-management-management-pc-c.html

UserLevel 3
徽章 +7

您是在备份运行时面临任何问题还是只想了解性能矩阵

虽然备份运行更多的IOP是正常的,但

徽章

您是在备份运行时面临任何问题还是只想了解性能矩阵

虽然备份运行更多的IOP是正常的,但

您是在备份运行时面临任何问题还是只想了解性能矩阵

虽然备份运行更多的IOP是正常的,但

是的,谢谢您的答复。.缓存命中率在备份运行时减少了,在备份窗口期间,我在VM上遇到了性能问题。

这些缓存是否告诉CVMS内存需要增加?

徽章

您是在备份运行时面临任何问题还是只想了解性能矩阵

虽然备份运行更多的IOP是正常的,但

您是在备份运行时面临任何问题还是只想了解性能矩阵

虽然备份运行更多的IOP是正常的,但

是的,谢谢您的答复。.缓存命中率在备份运行时减少了,在备份窗口期间,我在VM上遇到了性能问题。

这些缓存是否告诉CVMS内存需要增加?


当内容缓存命中率(%)达到6%或5%时,这意味着什么?

UserLevel 3
徽章 +3

@bas000m我以为我鸣叫。

从上面的图形来看,我猜想您的意思是“范围高速公路命中%”,而不是“内容缓存命中率”。如果我错了,请纠正我,我会在这里尝试解释它们。大多数人对范围缓存的命中率“低”,因为工作负载还不够预测。因此,在这里,5%至6%的值可能不是一个不好的数字,而零%则表示总不可预测性。

但是,对于Cache_stats中的其他命中率,例如“ VDisk Block Map”和“ LentagerGroupID”地图,我们希望具有高命中率的命中率为90+%,如果我们错过了这里,则会导致Cassandra的盘中看起来像Cassandra(服务可以用来罐头群集数据),这要慢得多。我在这里没有任何进一步的事情,而只是想证明“ cache_stats”第2009页中指示的每个命中率之间存在差异。

所以我做了一些研究,这就是我发现的。PRISM中“分析”页面中显示的“内容缓存命中率(%)”确实是“ Cache_stats”在集群2009页中显示的内容的组合。正如现在,它可能不是评估群集性能的最佳度量,因为每个参数都显示特定的信息并添加它们可能无法很好地转化有关群集的整体表现。这将来会更改,以便人们可以在cache_stats中选择所需的确切参数。

希望这对您的关注有所了解。

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