General :: E2fsck And Unmounted A Volume

I have two volumes, both with 800GB total used on them. lets call them /vol1 and /vol2. /vol2 is just a cron'd rsync'd copy of a folder on /vol1 which is a live share for many users.If I temporarily suspend the cronjob doing the rsync's from /vol1 to /vol2, is it safe to unmount and e2fsck /vol2, then remount it somehow?

Both /vol1 and /vol2 say the filesystem state is not clean when i do a tune2fs -l on them both. According to tune2fs both will check themselves upon restart, but if I can do /vol2 since it isn't the live data beforehand, that will cut my downtime in half the next time i restart the server.But I also wonder that if I can do this, then i remount /vol2, will the "not clean"-ness of /vol1 just be rsync'd back over to /vol2 the next time the rsync runs?