smartmontools: control the health of your hard disk
One of the packages I manually install in every new installation is smartmontools. I’ve some expertise in managing computers and networks, and it is a fact that pirate hackers and software bugs are not the main cause of problems in small and medium installations. Hardware is.
Thus, you have hardware that can fails, and Murphy says that if it can fail, it will. The point is not to avoid hardware failures, which would be impossible, but to detect them early or even prevent them.
Particularly for hard disks, the tool in charge is smartctl from the package smartmontools. IDE disks (if they’re not of the age of dinosaurs) have an integrated self-testing tool called SMART which means “Self-Monitoring, Analysis and Reporting Technology”. Modern SCSI disks have it too if they’re SCSI 3 or newer. It happens that inside the disk chipset there are routines to check parameters of disk health: spin-up time, number of read failures, temperature, life elapsed… And all of those parameters are not only registered by the disk chipset, but they have designated security limits and both parameters and limits can be checked by software who access the disk using the appropriate I/O instructions.
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