  Investigating disk usage? 
 The Question is:
 
My system disk is being filled up extensively,requiring me to have to copy
various files over to my user disk, I have a 4 gig system disk, are there
any log files that grow extensively that I need to purge. thanks.
 
 
 The Answer is:
 
  You can use commands such as DIRECTORY/SIZE/SELECT=SIZE=MINIMUM=1000
  to identify larger files, and files that are growing over time.
 
  Accounting, auditing, and the operator logs can all grow over time.
  Error logs can also become a factor if many errors are being logged.
 
  Periodic execution of commands such as:
 
    $ SET ACCOUNTING/NEW_LOG
    $ SET AUDIT/SERVER=NEW_LOG
    $ REPLY/NEW_LOG
 
  can be used to restart the logs on a daily or weekly basis, and then
  the ACCOUNTNG.DAT, SECURITY.AUDIT$JOURNAL, and OPERATOR.LOG can be
  purged.  (You will want to keep a week or two of copies of these files
  around to track recent activity (See PURGE/BEFORE="-7-"), and to maintain
  sufficient BACKUP of the data should you need to investigate security or
  other activity on a historical basis.)
 
  You will want to be aware of the rooted directory structure of the
  OpenVMS system disk before deleting files.  The files:
 
    SYS$SYSDEVICE:[SYS*]SYSCOMMON.DIR
    SYS$SYSDEVICE:[000000]VMS$COMMON.DIR
 
  are all exactly the same directory file, thus all files in each
  of these (apparently different) directories are actually the same
  set of files shared among all roots.  (Apologies if you are already
  familiar with OpenVMS system disk structure.)
 
  For further information, at http://www.openvms.digital.com:8000,
  see:
 
    /72final/6017/6017pro_085.html#6017accounting
 
    /72final/6017/6017pro_036.html#disk_mgmt_sec
 
    /72final/6017/6017pro_085.html#index_x_4883
 
  as a start.
 
  You can also relocate most of (all of?) the various files off the
  system disk.
 
  Note: The enabling and use of disk quotas on the system disk is not
  supported and not recommended.
 
