Would the remount command do it if I add the option in /etc/fstab?
Is this this a good idea?
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-o remount,noatime was an effective method of disabling atime without a reboot.
I don't know that I'd say it's a good idea, but if you intend to turn atime off, I don't see what it would be a bad idea either if you have an old enough kernel. According to the man page for mount:
The following mountflags can be changed: MS_RDONLY, MS_SYNCHRONOUS, MS_MANDLOCK; before kernel 2.6.16, the following could also be changed: MS_NOATIME and MS_NODIRATIME; and, additionally, before kernel 2.4.10, the following could also be changed: MS_NOSUID, MS_NODEV, MS_NOEXEC.