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How to compare Cloud Server performance from providers
As you all know, Cloud Server (Cloud VPS) is a virtual server similar to VPS but is based on cloud computing, so Cloud Server inherits the outstanding advantages of the powerful computing technology that traditional servers and VPS cannot have.
However, because of the same characteristics as VPS, Cloud Server is essentially a server created by a method of partitioning from one virtualization-based physical server into multiple servers, which have all features of dedicated servers. This means that when using Cloud Server, you will also have some neighbors sharing resources with you, including CPU, RAM, and storage devices (HDD / SSD).
Today, we are particularly interested in the input/output performance (I/O) of HDD/SSD over other factors as it is one of the really important factors that determine the performance of the overall Cloud Server.
In this regard, we cannot deny the outstanding performance of solid-state drives (SSDs) compared to traditional hard disk drives (HDDs). So, Cloud Servers using SSDs also performs much faster than Cloud Servers using HDDs. However, there are still a number of other factors that might change Cloud Server's performance, such as the number of Cloud Servers in the same physical server, or the storage platform that the provider uses.
In the world, many hosting providers (HP) have put into use the SSD for Cloud Server services such as DigitalOcean, RamNode, ServerMania, UGVPS... At the same time, there are several providers that also offer advanced middleware storage solution between SSD and HDD, which is called Cached-SSD. It's a combination of HDD and SSD. All regular data access (usually used) will be stored in the SSD while most of the less accessed data will be stored in the hard drive HDD. This method allows Cloud Servers to speed up I/O significantly while they also inherit large storage capacity of HDD at the same time.
Here's how to test f I/O performance and compare this element of Cloud Server among a few reputable providers to find the right Cloud Provider that suits your needs the best. In this article, we will examine I/O performance of the Cloud Server that uses SSD only and runs on Linux operating system.
Use the following command to test: dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
What is the criteria for evaluating Cloud Server I/O speed? How to know whether it is fast or slow? Generally, any server with I/O speed of above 50MB/s is considered acceptable. But after you perform this test, if you have a SSD-based Cloud Server that owns the above mentioned technology, resulting in less than 100MB/s is unacceptable.
Here are some results after the test:
By: James Paquin