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问题

CCTV到SSD而不是HDD

  • 2020年12月1日
  • 2个答复
  • 183次观点
Ibinema

你好nutanix社区

我有一个正在运行CCTV操作的VM。我以高分辨率和帧速率记录了多个视频流。旧文件用完时会删除。我如何确保没有用于录制的SSD来避免它们得太多的写周期太快？

亲切的问候，
Ibinema

Hello Nutanix Community<\/p>

I have a VM that is running CCTV operations. I record multiple video streams in a high resolution and frame rate. Old files get deleted when the space is used up. How can I make sure that the SSDs are not being used for the recording to avoid them to get too many write cycles too fast?<\/p>

Kind regards,
Ibinema<\/p>","quoteUsername":"Ibinema","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

2个答复

阿罗纳
秩
UserLevel 6
徽章 +5

有一种方法可以将VM固定到热层，但不是相反的方法。Nutanix簇旨在将至少存储SSD上的一些数据存储在将其冲洗到冷层之前。这只是存储中数据周期的一部分。

此外，据知道，由于数据的吞吐量很大（您提到了高分辨率和多个视频流），CCTV无论如何都需要低延迟存储。

如果存储潜伏期太高（读取HDD的速度不够快，无法处理系统可能会悬挂或压碎的所有I/O。

There is a way to pin a VM to a hot tier but not the opposite. Nutanix clusters are designed to store at least some of the data on SSDs before flushing it to the cold tier. This is just a part of the data cycle within the storage.<\/p>

Moreover, as far as know, CCTV requires low latency storage anyway due to the large throughput of data (you mentioned high resolution and multiple video streams).<\/p>

If the storage latency is too high (read HDD is not fast enough to process all the I\/O the system may hang or crush.<\/p>","quoteUsername":"Alona","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

谢尔盖·伊万诺夫
秩
UserLevel 4
徽章 +5

由于CCTV应用程序大多以较大的块大小依次编写数据，因此写入HDD可能是有益的。您可以尝试在存储容器级别上更改顺序IO的层级优先级：

NCLI容器编辑名称=  sequention-io-priority-order-order = das-sata，ssd-sata，ssd-pcie

确保使用该容器的CCTV应用程序除了CCTV应用程序之外别无其他，因为它将对其他所有内容的性能产生负面影响。

它可能不会改变很多，因为这取决于处理CCTV数据的应用程序如何工作。如果情况恶化，只需运行以下命令恢复默认值：

NCLI容器编辑名称= sequention-io-priority-order-order = ssd-pcie，ssd-sata，das-sata

员工SRE |Nutanix Worldwide支持|NSS＃464，NCAP，VCP6.5-DCV，RHCE，CCNA，EMCSA，2XAWS和Google Cloud认证
As the CCTV applications mostly write the data sequentially in large block sizes, it might be beneficial to write to the HDDs. You may try to change the tier\u00a0priority of the sequential IO on the storage container level:<\/p>
ncli container edit name=<container_name> sequential-io-priority-order=DAS-SATA,SSD-SATA,SSD-PCIe<\/pre><\/blockquote>
Make sure that there is nothing else other than CCTV application using that container, as it will negatively affect the performance of everything else.<\/p>
It is possible that it will not change a lot, because it depends on how the application that handles the CCTV data works.\u00a0If it gets worse, just revert to default by running this command:<\/p>
ncli container edit name=<container_name> sequential-io-priority-order=SSD-PCIe,SSD-SATA,DAS-SATA<\/p><\/blockquote>","quoteUsername":"Sergei Ivanov","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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