Is this really so hard to be done ?
Disk quotas for user admin2 (uid 2474):
Filesystem blocks quota limit grace files quota limit grace
/dev/md2 0 314572800 314572800 1 3145729 3145729
/dev/md3 184 314572800 314572800 46 3145729 3145729
/dev/md4 68291624 314572800 314572800 968008 3145729 3145729
Just read this:
968008 as current usage and then 3145729 as account limit and this should be realtime.