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What system is polarfs?

PolarFS What system is it ?




Take the answer 1:

This is a PolarDB O An important component of the engine

User state file system (Polar File Sytem, abbreviation PolarFS). Because database instances of multiple hosts need to access the same data on block storage , frequently-used Ext4 And other file systems do not support multi-point mounting ,PolarDB The database team has developed a special user state file system , Provide common file reading, writing and viewing interfaces , Support similar O_DIRECT Read and write data in a non cached way , It also supports atomic writing of data pages ,IO Excellent features such as priority , It provides a solid guarantee for the high performance of the upper database . Traditional file systems , Because it is embedded in the operating system kernel , Every system file read and write operation needs to fall into the kernel state first , Return to user status after completion , It leads to inefficiency .PolarFS Compiled in the form of function library PolarDB in , Therefore, they all run in user mode , Thus, the overhead of operating system switching is reduced .

Hello , Please refer to the official Alibaba cloud documentation : https://help.aliyun.com/document_detail/173220.html


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