[Halld-offline] Fwd: /volatile areas created for Halls A,C,D; updated CLAS

[Mark M. Ito]

Folks,

The message below is from Sandy Philpott.

We now have access to up to 40 TB of disk space on the "volatile" file 
system at the Lab.

o storage is temporary; there are scripts which run to delete old files
o a quota system is enforced by the operation of these cleaning scripts
o the system has two disk usage level triggers, called "quota" and 
"reservation", the former is a global maximum per group, the latter is 
used when the disk as a whole runs out of space (the sum of all quotas 
exceeds the available space, by design)
o the system is explained at the bottom of the page referenced in 
Sandy's message

The /volatile partition is only available from the farm nodes at the 
Lab. This space is independent of our "work" space (/work/halld). Work 
space is not subject to deletion by scripts.

Two possible use cases for this space are (1) for staging files into and 
out of farm nodes and (2) for storage of data that are permanently 
stored elsewhere (e. g., on tape) for repeated analysis at the Lab.

I have created a directory, /volatile/halld/home, for users to put their 
personal directories.

Let me know if you have problems or questions.

   -- Mark

-------- Original Message --------
Subject: 	/volatile areas created for Halls A,C,D; updated CLAS
Date: 	Thu, 20 Oct 2011 16:17:17 -0400
From: 	Sandy Philpott <sandy.philpott at jlab.org>
To: 	marki at jlab.org, brads at jlab.org, ole at jlab.org
CC: 	heyes at jlab.org, weygand at jlab.org, Ying Chen <ychen at jlab.org>, 
farm at jlab.org



All,

Per your direction at the SciComp/Physics meeting, I have allocated the
remaining 40TB of Lustre as /volatile for each hall.

I added the top level /volatile areas for halla, hallc, halld, with 10TB
reservation and 40TB quota each, and added 10TB more for CLAS to include
the clasdatamine, clase1-6, and claseg2 areas.

Note that this allocates all of the 100TB Lustre space from the last
Physics filesystem procurement:
  20TB replaces oldest /cache
  10TB for /stage to LTO5 tape
  30TB /volatile/clas replacing old /work/clas/disk[1-10]
  40TB /volatile for A,B,D with 10TB reservation and 40TB quota, 10TB
more for CLAS

The webpage for viewing usage is at
http://scicomp.jlab.org/disk/volatile.faces .  I'm sure there are
adjustments to be made as the users find this new space...

Please let me know if you'd like to configure your area in more detail
with specific project assignments, and I can make the changes when I get
back from travel.

Regards,
Sandy


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