VPS Server Upgrade principle and fault resolution method

With the rapid development of information construction, many enterprises realize their own server has been unable to meet their own development needs. A company server will often be down, and so on, because the server can not afford more user access, as well as the processor because too old can be too high resource occupancy situation. And the old machine costs more, so the VPS server needs to be upgraded. We need to be aware of the principles of the upgrade and troubleshooting methods.

First, the server upgrade principle

1. The purpose of the server upgrade is to solve the bottleneck in one aspect of the system, but the result of the upgrade cannot cause the new system bottleneck.

The upgrade should be considered for the server on which side of the bottleneck, but from the application, not because the simple upgrade of a part, and other performance bottlenecks. As a simple example, a single CPU server can configure 256MB of memory, but if the dual CPU server is configured with 256MB of memory, memory will certainly become a bottleneck for the system.

2. The premise of the server upgrade is that the system hardware configuration can provide the user upgrade space.

Server upgrade is in the server hardware configuration has the ability to upgrade the premise, so in the early days of network planning, management personnel should have an initial estimate of application needs and growth, in the selection of models, for the future expansion to reserve a certain space.

3. The upgrade must be specific to the application, rather than simply adding hardware.

The application of the server is often special purpose, a server is mainly for one application, so when the server has a performance bottleneck, the upgrade should be for this application upgrade, not for a certain part. It is not considered simple to upgrade a single piece of hardware to meet the performance needs of the application.

Second, the server upgrade fault resolution

1. Online Upgrade: The system does not power off the situation, the upgrade of a part, the system is not affected by any. On the IA architecture server, upgrades to hot-swappable drives and RAID-level migrations are not restarted without a system.

2. Offline Upgrade: The system needs to be shut down and the upgrade needs to be carried out without being charged. This mainly refers to the CPU, memory upgrade. For example, the upgrade of the CPU, whether it is to extend the CPU or replace the CPU, it is recommended that the system reinstall. When scaling the CPU, especially if a single CPU is extended to multiple CPUs, the system needs to reinstall the SMP kernel, which requires the system kernel to be re-compiled for Unix systems, and for Windows systems to reinstall the operating system. Another example is the memory upgrade, after the memory increase, the system performance parameters and database application parameters must be adjusted.

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VPS Server Upgrade principle and fault resolution method