Scale-up and scale-out

From the original station, what you have been confused about, and tables, you want to help people who are confused or about to be confused.

Speaking of system scalability,Scale-Up(Vertical scaling) andScale-Out(Horizontal scaling) is two common terms. For Beginners, it is easy to confuse these two concepts. Here we summarize some clear explanations of these concepts.

First, let's talk about Wikipedia.

Scale vertically (scale up) to scale vertically (or scale up) means to add resources to a single node in a system, typically involving the addition of CPUs or memory to a single computer. such vertical scaling of existing systems also enables them to leverage virtualization technology more than tively, as it provides more resources for the hosted set of operating system and application modules to share. taking advantage of such resources can also be called "Scaling Up", such as expanding the number of Apache daemon processes currently running. scale horizontally (scale out) to scale horizontally (or scale out) means to add more nodes to a system, such as adding a new computer to a distributed software application. an example might be scaling out from one Web Server System to three. as computer prices drop and performance continues to increase, low Cost "commodity" systems can be used for high performance computing applications such as seismic analysis and biotechnology workloads that cocould in the past only be handled by supercomputers. hundreds of small computers may be configured in a cluster to obtain aggregate computing power which often exceeds that of single traditional RISC processor based scientific computers. this model has further been fueled by the availability of High Performance interconnects such as Myrinet and InfiniBand technologies. it has also led to demand for features such as remote maintenance and batch processing management previously not available for "commodity" systems. the scale-out model has created an increased demand for shared data storage with very high I/O performance, especially where processing of large amounts of data is required, such as in seismic analysis. this has fueled the development of new storage technologies such as object storage devices.

Scale vertically (scale up)

To scale vertically (or scale up) means to add resources to a single node in a system, typically involving the addition of CPUs or memory to a single computer. such vertical scaling of existing systems also enables them to leverage virtualization technology more than tively, as it provides more resources for the hosted set of operating system and application modules to share.

Taking advantage of such resources can also be called "Scaling Up", such as expanding the number of Apache daemon processes currently running.

Scale horizontally (scale out)

to scale horizontally (or scale out) means to add more nodes to a system, such as adding a new computer to a distributed software application. an example might be scaling out from one Web Server System to three.

as computer prices drop and performance continues to increase, low Cost "commodity" systems can be used for high performance computing applications such as seismic analysis and biotechnology workloads that cocould in the past only be handled by supercomputers. hundreds of small computers may be configured in a cluster to obtain aggregate computing power which often exceeds that of single traditional RISC processor based scientific computers. this model has further been fueled by the availability of High Performance interconnects such as Myrinet and InfiniBand technologies. it has also led to demand for features such as remote maintenance and batch processing management previously not available for "commodity" systems.

The scale-out model has created an increased demand for shared data storage with very high I/O performance, especially where processing of large amounts of data is required, such as in seismic analysis. this has fueled the development of new storage technologies such as object storage devices.

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Poor English? It doesn't matter. I have prepared a chinese copy for you, fromHereHe uses fish farming as an image metaphor.

When you only have six or seven fish,

A small fish tank is enough. But after a while, more than 30 new fish are generated. This small tank is obviously not big enough.

If you useScale-UpSolution, then you need to buy a large cylinder, take out all the sand, water plants, sets, heating rods, and thermometers from the small cylinder, and re-arrange them into the big cylinder. This project is not simple. It cannot be determined in ten minutes or eight minutes, especially when it comes to water plants.

The engineering complexity of data migration is too complex ).

now let's change your mind and use scale -out solution, this is equivalent to connecting two cylinders with the same cylinder next to this cylinder. The fish can be automatically dispersed into two tanks, and you will save the above-mentioned series of troubles such as sand migration, water plants, and scenery.