what is vsan

VSAN is a virtualization technology used on Cisco SAN switches to virtualize a physical switch into multiple logical switches. A scalable distributed storage architecture usually developed based on the vSphere kernel.                                                                                                                                                   (Recommended learning: phpstorm)

VSAN is a scalable distributed storage architecture developed based on the vSphere kernel. VSAN builds the VSAN storage layer by installing flash memory and hard disks in vSphere cluster hosts.

These devices are controlled and managed by VSAN, which forms a unified shared storage layer for vSphere clusters.

You can use this VSAN architecture in a new VSAN or existing vSphere cluster. You just need to ensure that the VSAN host has enough disk slots and supports the storage controller. VSAN provides a shared storage source that supports various types of workloads and is easy to manage.

VSAN is similar to VLAN in Ethernet. Each VSAN has its own fabric service.

Devices in the same VSAN can communicate with each other, but different VSANs cannot communicate with each other. Each switch can support up to 256 VSANs.

VSAN 1 is the default VSAN, VSAN 4094 is the isolated VSAN, and the VSAN ids available to users are 2 to 4093.

- All switch ports are in VSAN 1 by default; when a port is deleted from the user-defined VSAN, the port will be automatically assigned to VSAN 4094, and the devices in VSAN 4094 are disabled.

Flexible VSAN configuration: The VSAN system provides the simplest recommended configuration. VSAN can choose between the minimum and maximum values ​​according to its own needs. VSAN can obtain the best capacity. /performance ratio.

Good hardware compatibility of VSAN: You can refer to the hardware compatibility list published by VSAN to set or purchase different configurations for VSAN.

While the VSAN open reference architecture provides flexibility, VSAN also brings some unavoidable potential risks, and enterprises must effectively manage VSAN. But this does not mean that VSAN is an unacceptable method, it just requires enterprises to have an in-depth understanding of VSAN and complete comprehensive testing.

While VSAN has flexibility, enterprises lose the predictability that VSAN needs to ensure performance. VSAN Customizing the flash memory ratio or hard disk type also brings certain potential risks.

VSAN For each controller, VSAN publishes default and recommended queue lengths, but VSAN reference values ​​may cause some problems. And VSAN also needs to adjust some other configurations, otherwise VSAN will cause serious performance problems.

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