AHV Hypervisor上的内存分配和分配

  • 2020年10月17日
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Kiran苏利耶
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徽章

AHV Hypervisor上的内存分配和分配总是一个棘手的等式，计算起来并不简单或直接。我决定深入研究这方面，发现相当复杂。

我从Acropolis Master运行以下命令并收集主机10.21.46.243的信息:

美元的链接http: 0:2030

让我们参考本清单中该主机的数据:

主机IP: 10.21.46.243

cpu: 88

cpu使用:37.58

CPU自由:50.42

内存:515822 MB即512gb

内存使用:261104 MB，即261104 GB

内存预留:0mb

内存空闲:254718 MB即255gb

请注意，我们通过在主机管理程序上运行# cat /proc/meminfo获得的输出将显示MemFree和MemAvailable字段的少量数字(小于0.2%)

主机总内存):

[root@NTNX-16SM76360147-A ~]# cat /proc/meminfo | head -3 .使用实例

MemTotal: 528210648 kB

内存清理:1891960 kB

MemAvailable: 2619508 kB

root@NTNX-16SM76360147-A ~ #

这是因为内存分配是由Hypervisor通过所谓的Hugepages提前分配给vm的，命令中有一个字段

输出显示提到这个数字。请注意，主机上的512gb RAM中，只有大约1到2gb的RAM被保留或被列出的# ps -eaf进程占用，你会在AHV Linux操作系统上看到。

回到我们在Acropolis中提到的例子，即主机10.21.46.243,512 GB的总内存被拆分如下:

vm使用的内存(包括CVM使用的32gb，可能不会显示在Acropolis表中)= 212 GB

$ links http:0:2030/sched -dump

vm上10.21.46.243

+------------------------------------------------------------------------------------------+
|名称| UUID |状态|CPU |CPU |CPU |内存|目的地址|
| | | | |使用|免费| | |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEN34 |caa059f7-3d86-4bcd-b7fe-88819f305bf0| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvDet04 |716050b6-817d-43cc-b5c5-5244b45fa2ad| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| KapellaSF |fd3f9ef9-b5cb-4fc3-aa3f-5726d988adb8| On | 2| 0.02|1.98| 4gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvCivil13 |d0dbb045-97f9-4e55-bb24-6773298bfba0| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvDet01 |67105ade-a32f-4410-babe-a6126187741c| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| Altair27 |7348c35d-fc01-4a63-81fc-f48efc861bc2| On | 2| 0.01|1.99| 4gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvDek10 |4f5c11c4-653c-45d5-bb5c-a9b5ceb02e63| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WMVOTLW02 |f00f6f6f-65ea-4c9c-8b39-0a490ad2b2dd| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEK80 |56a1e5bb-653a-47f0-9566-9d73c57c714c| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvDet17 |5a906266-d1ad-4484-b85d-c28639f9db56| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWES27 |2bdfd126-a6f2-441b-9b0d-67462647c882| On |2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEY31 |fb129c75-8926-43b9-90a1-779982b1931a| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| wmvdisn4 |671cde8f-f555-4a92-8697-602ed9e522cd| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWER45 |9645c0b9-8d6d-41ea-9b94-14721606bdc3| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWET10 |9dc45338-4ca6-403d-874e-3d92e31ed49f| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWES75 |4b996bf0-03b6-4957-8d1f-39ef869e3eea| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| wmvdpn7 |aa52edaa-c350-4eaf-a904-0284f489a5fc| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEQ40 |39b250be-33a4-44dd-9c0f-c132cde461a2| On | 2| 0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvDet13 |be0188de-cb80-44c1-bf50-e87a01ca17ef| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| wmvdisn6 |fe3b7177-b602-454c-9301-56801a90767a| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEP50 |38aeb025-6979-4bd1-adb5-0edde9c8ad92| On | 2| 0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEW74 |924e2aac-f19f-451b-a1ac-11bfa40921e8| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWER26 |56712f21-adfc-42a2-b7f2-eba348e25f87| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEL30 |3de91f71-f053-4e01-a18d-e3836fe581ed| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WMVOTLW04 |5f3ab684-0952-44bb-aecf-261992ed0bd2| On | 2| 0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEA79 |390c96ed-de43-4174-b90e-7fabddab511e| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvFire01 |a4720efe-609c-4d12-bbd2-ff7b5f6bd73e| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|WMVAdminWEL05|1cbeef63-61bc-453b-a2b2-7a6807925d53| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWED48 |323adcd6-f296-4164-8c4b-8be0badc9e01| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWES43 |8565610e-03b7-4544-bd04-67547727c844| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEO38 |b5d6cb1c-1f10-46e5-9962-15bea9119c08| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEP52 |0293e426-be16-4c56-b18f-5bc354087bfb| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEE71 | fe|a9 -ed4a-4387-917a-0e2e665e5e5a| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEV35 |c1f4ab5f-3d55-4683-9482-d2bc02b457cd| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEC49 | 6376bad -906d-42a7-a9a7-ec2b95c38195| On | 2 |0.10|1.90| 6gb |无|
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEX24 |20cb3af -8a1f-4b98-9b3f-cf38d51216a6| On |2 |0.10|1.90| 6gb |无|
+------------------------------------------------------------------------------------------+

High Availability预留内存:40gb

可用内存= 255gb

Hypervisor为其进程占用的内存= 2 GB

请注意，上述数字并不精确，但已足够接近准确的值。

希望上面的解释解释了内存分配。

从限制我们自己的单一主机稍微偏离，我们经常看到在主机之间的“内存空闲”字段的差异，从高到100 GB到低到402 MB，这取决于每个主机提供服务的虚拟机数量，以及特定主机上单个虚拟机的大小，这将决定该主机上有多少内存可用。如果查看构成高可用性资源的Memory Reserved列，您将看到每个主机向HA池贡献的RAM数量有更多的一致性或更少的差异。

独轮车手
Memory allocation and distribution on the AHV Hypervisor is always a tricky equation and not very easy or straight forward to calculate.\u00a0 I decided to dig deep into this aspect, and the findings were quite intricate.<\/p>

I ran the following command from the Acropolis Master and gathered information for Host 10.21.46.243:<\/p>

$ links http:0:2030<\/a><\/p>

\u00a0<\/p>

Let us refer to the data obtained for this Host on this listing:<\/p>

Host IP: 10.21.46.243<\/p>

CPUs: 88<\/p>

CPUs used: 37.58<\/p>

CPU free: 50.42<\/p>

Memory: 515822 MB say 512 GB<\/p>

Memory used: 261104 MB say 261 GB<\/p>

Memory Reserved: 0 MB<\/p>

Memory free: 254718 MB say 255 GB<\/p>

Please note that the output we obtain by running # cat \/proc\/meminfo on the Host hypervisor will show small numbers for MemFree and MemAvailable fields (less than 0.2%<\/p>

of the Total RAM on the Host):<\/p>

\u00a0<\/p>

[root@NTNX-16SM76360147-A ~]# cat \/proc\/meminfo | head -3<\/p>

MemTotal: \u00a0 \u00a0 \u00a0 528210648 kB<\/p>

MemFree: \u00a0 \u00a0 \u00a0 \u00a0 1891960 kB<\/p>

MemAvailable:\u00a0 \u00a0 2619508 kB<\/p>

[root@NTNX-16SM76360147-A ~]#<\/p>

This is because Memory allocations are made in advance by the Hypervisor to provision VMs through what are referred to as Hugepages, and there is a field in the command<\/p>

output display mentioning this number. Please be aware that of the 512 GB of RAM on the Host, only about 1 to 2 GB of RAM is reserved or taken up by the # ps -eaf processes listed that you would see on the AHV Linux OS.<\/p>

Going back to our example we are referring to in Acropolis i.e. Host 10.21.46.243, the Total Memory of 512 GB is split as follows:<\/p>

Memory used by VMs (including 32 GB by CVM which may not show up in the Acropolis tables) = 212 GB<\/p>

$ links http:0:2030\/sched -dump<\/p>

\u00a0 VMs on 10.21.46.243<\/p>

+------------------------------------------------------------------------------------------+
|    Name     |                UUID                |State|CPUs|CPU |CPU |Memory|Destination|
|             |                                    |     |    |used|free|      |           |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEN34 |caa059f7-3d86-4bcd-b7fe-88819f305bf0| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvDet04   |716050b6-817d-43cc-b5c5-5244b45fa2ad| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  KapellaSF  |fd3f9ef9-b5cb-4fc3-aa3f-5726d988adb8| On  | 2  |0.02|1.98| 4 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvCivil13  |d0dbb045-97f9-4e55-bb24-6773298bfba0| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvDet01   |67105ade-a32f-4410-babe-a6126187741c| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|   Altair27  |7348c35d-fc01-4a63-81fc-f48efc861bc2| On  | 2  |0.01|1.99| 4 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvDek10   |4f5c11c4-653c-45d5-bb5c-a9b5ceb02e63| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WMVOTLW02  |f00f6f6f-65ea-4c9c-8b39-0a490ad2b2dd| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEK80 |56a1e5bb-653a-47f0-9566-9d73c57c714c| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvDet17   |5a906266-d1ad-4484-b85d-c28639f9db56| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWES27 |2bdfd126-a6f2-441b-9b0d-67462647c882| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEY31 |fb129c75-8926-43b9-90a1-779982b1931a| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvDispN4  |671cde8f-f555-4a92-8697-602ed9e522cd| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWER45 |9645c0b9-8d6d-41ea-9b94-14721606bdc3| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWET10 |9dc45338-4ca6-403d-874e-3d92e31ed49f| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWES75 |4b996bf0-03b6-4957-8d1f-39ef869e3eea| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvDispN7  |aa52edaa-c350-4eaf-a904-0284f489a5fc| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEQ40 |39b250be-33a4-44dd-9c0f-c132cde461a2| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvDet13   |be0188de-cb80-44c1-bf50-e87a01ca17ef| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvDispN6  |fe3b7177-b602-454c-9301-56801a90767a| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEP50 |38aeb025-6979-4bd1-adb5-0edde9c8ad92| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEW74 |924e2aac-f19f-451b-a1ac-11bfa40921e8| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWER26 |56712f21-adfc-42a2-b7f2-eba348e25f87| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEL30 |3de91f71-f053-4e01-a18d-e3836fe581ed| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WMVOTLW04  |5f3ab684-0952-44bb-aecf-261992ed0bd2| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEA79 |390c96ed-de43-4174-b90e-7fabddab511e| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|  WmvFire01  |a4720efe-609c-4d12-bbd2-ff7b5f6bd73e| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
|WMVAdminWEL05|1cbeef63-61bc-453b-a2b2-7a6807925d53| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWED48 |323adcd6-f296-4164-8c4b-8be0badc9e01| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWES43 |8565610e-03b7-4544-bd04-67547727c844| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEO38 |b5d6cb1c-1f10-46e5-9962-15bea9119c08| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEP52 |0293e426-be16-4c56-b18f-5bc354087bfb| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEE71 |febbb4a9-ed4a-4387-917a-0e2e665e5e5a| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEV35 |c1f4ab5f-3d55-4683-9482-d2bc02b457cd| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEC49 |6376bfad-906d-42a7-a9a7-ec2b95c38195| On  | 2  |0.10|1.90| 6 GB |   None    |
|-------------+------------------------------------+-----+----+----+----+------+-----------|
| WmvGenWEX24 |20cb3aff-8a1f-4b98-9b3f-cf38d51216a6| On  | 2  |0.10|1.90| 6 GB |   None    |
+------------------------------------------------------------------------------------------+<\/code><\/pre>
Memory reserved for High Availability = 40 GB<\/p>
Memory available = 255 GB<\/p>
Memory taken by Hypervisor for its processes = 2 GB<\/p>
Please note that the above numbers are not precisely accurate but close enough to the exact values.<\/p>
Hope the above explanation explains the Memory allocations.<\/p>
Digressing slightly from confining ourselves to a single Host, we often see a disparity amongst the Hosts for the \"Memory free\" field, ranging from a high as much as 100 GB to as low as 402 MB, this depends on the number of VMs that each Host is serving and on the sizes of the individual VMs on that specific Host that will dictate how much Memory is free on that Host. If you look at the Memory Reserved column, that makes up the resources for the High Availability, you will see more conformance or less variance in the amount of RAM contributed by each Host towards the HA pool.<\/p>","quoteUsername":"Kiran Surya","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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