Many routers run a Linux OS and abrupt power failure can happen. Considering this - how do they handle the possibility of file system corruption caused by a power failure? If they make the system read only, how are you able to change settings?
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I had a power failure two days ago that crashed my home made router, so I'm also interested in the answer!! (In my case it was a HW failure but anyway.) – Cilyan Feb 28 '14 at 16:10
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Routers and other small linux devices do not use hard drives.
They use different types of RAM:
- DDR RAM as working storage
- ROM for system image (Kernel + OS)
- Non Volatile RAM for Settings (/dev/nvram)
In case of an crash they boot again and reinitialize the OS, so nothing get's lost.
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Thanks for the answer, so in case of firmware update, how do you go? – user2029200 Oct 25 '14 at 10:11
