Usermapper export or lookup via server_cifssupport  Other alternative is to look at 3rd party quota software like from NTP or Northern
Recently I've enabled soft quotas for all users on a particular VNX file system containing their Home drives.  When the quota is exceeded an alert is generated in the VNX's log which reads something like this (pay attention to the "Message" line, particularly the underlined uid):  Severity:  Warning System:  (the system name) Domain:  Local Created:  the date and time Message:  Slot 3:  Block soft quota crossed (fs /root_vdm_2/AMHOME_DM3, uid 37423 Full Description:  Block soft quota limit has been crossed for a specified user, gourp or tree ID in the error message  The problem is the uid does notidentify the user by logon name.  There may be close to 1000 people with home directories in this share.   How is it possible to match the uid with a logon name?   Thank you.
Quota reporting question