Server :: Possible To Remount To Add Noatime?

I currently have this filesystem for my live squid server. Can I remount it to add noatime while the cache is being used?

[root@ ~]# cat /proc/mounts
rootfs / rootfs rw 0 0
/dev/root / ext3 rw,data=ordered 0 0
/dev /dev tmpfs rw 0 0
/proc /proc proc rw 0 0
/sys /sys sysfs rw 0 0
/proc/bus/usb /proc/bus/usb usbfs rw 0 0
devpts /dev/pts devpts rw 0 0
/dev/sda3 /var ext3 rw,data=ordered 0 0
/dev/sda1 /boot ext3 rw,data=ordered 0 0
tmpfs /dev/shm tmpfs rw 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
/etc/auto.misc /misc autofs rw,fd=7,pgrp=2586,timeout=300,minproto=5,maxproto=5,indirect 0 0
-hosts /net autofs rw,fd=13,pgrp=2586,timeout=300,minproto=5,maxproto=5,indirect 0 0
nodev /dev/oprofile oprofilefs rw 0 0
/dev/sda2 /var/spool/squid reiserfs rw 0 0

Remount:
mount -o noatime,remount,rw /dev/sda2