Safe to remount live partition?

So, I need to remount the file system at /var with the user_xattr
option. /var contains Samba shares, internal web sites, and other
priceless data. Oh, and LVM is involved here.

Is it safe to issue "mount -o remount,user_xattr
/dev/VolGroup00/LogVol04" while in live use?

Color me skeptical.

Alan
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