Disk Space at Green Bank

There are three main areas where you may store data:

• Your user area: /users/username
  This is your home directory, where you start when you log in. This area is quota'ed and you may keep a maximum of 3 Gigabyte here. This area is backed up on a daily basis so any files kept here are safe from accidental deletion.
  
  
• Your scratch area: /home/scratch/username
  This is another area where larger and less important files may be stored. This area is not quota'ed but if the disc fills up too much you may be asked to move or delete data. This area is not backed up. If you need data in this area backed up please make use of one of the public tape drives.
  
  
• Number cruncher and public scratch area(s).
  These areas are for storing data temporarily only, eg while using the number crunching machines. The discs are attached to the host listed, not to the main fileserver. You should only store data in these areas while you are actually using the machines. Once you have finished please delete or move the data. These areas are not backed up.
  
  

  Host	Disk	Size	Notes
  Euclid	/home/euclid/scratch	460G	NFS exported, Note 1
  Thales	/home/thales/scratch	230G	NFS exported, Note 1
  bratac	/export/home/bratac/scratch	230G	local disk only
  volans	/export/home/bratac/scratch	17G	local disk only
  Table 1

1. These discs are level 0 RAID arrays or single disks. This means they are very vulnerable to power failures.

If you have a NRAO Linux workstation on your desktop you may have additional storage available. This will appear as /export/home/machinename. Such discs are not backed up except by special arrangement with the Computing Division.

What you can do to help.

• Don't store data in any of the areas listed in table 1 unless you are working on it on that machine.
• Keep your data organised. Easier for you and easier for the sysadmins when restoring your files.
• Don't keep multiple copies of the same file in different places. Use softlinks instead.
• Don't keep unwanted data online, copy it to tape or delete it when you have finished with it.
• Log out when you leave for the night.