O&M Overview
IT O&M means that the IT department of an enterprise uses technical means to manage the IT system. It is a comprehensive, sophisticated, and specific service. Routine IT O&M services include software management and hardware management. In software management, maintaining device stability and efficiency through the OS is the core and key part of IT O&M.
Specifically, by monitoring dynamic changes of performance metrics such as the CPU, memory, and I/O in a device, related problems can be effectively prevented or located. For example, the CPU is overloaded due to various service reasons, which slows down the service response. In this case, you need to monitor the CPU usage. When the memory usage remains high for a long time, you need to use the memory analysis tool to monitor related hardware or processes. When the efficiency of read/write operations is low, I/O data needs to be monitored to evaluate I/O performance.
In addition, when a fault such as system breakdown, deadlock, or breakdown occurs, you need to perform troubleshooting on the OS to quickly locate and rectify the fault. For example, you can trigger kdump to collect system kernel information and then analyze the information. When you need to change the system password, enter the single-user mode and change the password of the root user. The file system can be damaged due to frequent forcible power-on and power-off. If the OS fails to automatically repair the file system, you need to manually repair it. For example, modify the drop_caches content to manually release the memory. In addition, you need to collect information, such as log files and device files, when a fault occurs, so that you can comprehensively analyze the root cause of the fault.
Therefore, being familiar with the usage of the OS performance analysis tool and fault rectification operations is the key to implementing comprehensive IT O&M management.
