ESXi | vCenter中的容器大小与Prism中的容器大小不相关

  • 2020年10月1
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徽章 ＋5

为了开始这个主题，有必要提一下数据大小单位之间的差异。有gb (字节)及gib (gibibyte)．区别如下:

Gb = 1000mb

GiB = 1024mib

所以，区别在于二进制和十进制的表示方式。它可能会令人困惑，因为很多人从来没有听说过gibibytes，总是认为GB是1024mb。事实上，这并不完全正确眨眼:

为什么在ESXi hypervisor上运行的Nutanix会令人困惑?

Nutanix使用MiB、GiB、TiB等作为数据大小单位。当您创建一个存储容器时，您将获得二进制单位的大小。例如，我创建了两个容器，其通告容量分别为1000gib和1024GiB:

我们可以看到，1000 GiB容器的总大小是0.98 TiB，因为1 TiB=1024 GiB。

然而，当我们进入vCenter时，我们可以看到不同的画面:

vCenter上报的1000g GiB容器为1000g, 1024g GiB容器为1TB。但是1tb等于1000gb !这里的问题是vCenter将tebibytes (TiB)和gibibytes (GiB)显示为terabytes (TB)和gigabytes (GB)，这是错误的。因为vCenter是VMware的产品，所以Nutanix对此无能为力。我相信VMware做它是为了简单，避免与人们不使用的单位混淆。但这可能会导致Prism和vCenter的数据略有不同。事实是vCenter中的TB和GB实际上是TiB和GiB，在那里没有存储空间的损失，可以使用整个容器大小。

Sr. SRE | Nutanix全球支持| NSS #464, NCAP, VCP6.5-DCV, RHCSA, CCNA, EMCSA, AWS和谷歌云认证
To start this topic, it is worth to mention the difference between the data size units. There are GBs (gigabytes<\/a>) and GiBs (gibibytes<\/a>). The difference is the following:<\/p>

GB = 1000 MB<\/p>

GiB = 1024 MiB<\/p>

So, the difference is in binary vs decimal representation. It can be confusing, because a lot of people have never heard of gibibytes and always thought that GB is 1024 MB. In fact, it is not exactly true\u00a0\":wink:\"<\/p>

Why it may be confusing in Nutanix running on ESXi hypervisor?<\/u><\/p>

Nutanix is using MiB, GiB, TiB, etc as data size units. When you create a storage container, you get the size in binary units. For the example, i have created 2 containers with advertised capacity of 1000 GiB and 1024GiB:<\/p>

\"//www.jhbzcj.com/next/how-it-works-22/\"<\/figure>

We can see, that the 1000 GiB container is 0.98 TiB\u00a0is total size, because 1 TiB=1024 GiB.<\/p>

However, when we go to the vCenter, we can see a different picture:<\/p>

\"//www.jhbzcj.com/next/how-it-works-22/\"<\/figure>

vCenter reports that the 1000 GiB container is 1000 GB in size and 1024 GiB container is 1TB. But 1 TB is 1000 GB! The problem here is that the vCenter shows tebibytes (TiB) and gibibytes (GiB) as terabytes (TB) and gigabytes (GB), which is wrong. Since vCenter is the product of VMware, Nutanix cannot do anything about it.\u00a0I believe VMware\u00a0made it for simplicity and to avoid confusion with the units that people are not used with. But that can cause a slight difference in numbers between the Prism and vCenter. The fact is that the TB and GB in vCenter are actually TiB and GiB and there is no lost storage space there, the whole container size can be used.<\/p>","quoteUsername":"Sergei Ivanov","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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