remount xfs / as readonly and sync

[Amit D Chaudhary <amit@xxxxxxxxxxxxxx>]

Hi,

This is a rather simple question, for a xfs partition mounted as 
/(root), before reboot it is mounted as read-only to ensure all data is 
flushed. Is this considered to be ok practise as far as xfs is 
concerned? It is really a handling from the original ext2 /. Actual 
statement is
mount -n -o ro,remount /

Also, at times some of the scripts do a sync call to flush dirty data to 
disk including that on the xfs root, again will this work as documented 
in man sync?
Running linux-2.4.5+xfs1.0.1 in this case.

Thanks and Regards
Amit