Safe to remount live partition?

[Matt Graham]

From: "Dayley, Alan" <ADayley at adtron.com>
> 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 [the filesystem's] in live use?

I'd say so.  mount may say, "Hey, we can't do that!!1!" but if it
does, the filesystem will behave like it was behaving before.  I
just did "mount / -o remount,user_xattr" without any problems at
all, and_{_{xDxD
eth0: transmit timed out