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Did you know you can change some Linux mount options at runtime? You can and it works just fine.

mount -o noatime,remount,rw /dev/hda3

Will do a live remount and just change the necessary options.

I specifically just did this to add noatime to benchmark the performance update.

You should theoretically be able to do this on a live and production machine but I’d recommend doing this with the machine out of service, all daemons shutdown, and the filesystem sync’d.