[Halld-controls] Group area for Hall D Online and Controls

[Elliott Wolin]

Hi,

At Controls and Online meetings we discussed the possible need for disk 
space that is accessible by embedded computers, controls components, 
EPICS IOC's, etc.  Here we were talking about space for config files and 
program, not for voluminous data.  Two possibilities arose:

- purchase a computer and set it up as a mini-fileserver
- get space on the CUE /group disk system

I propose we try using the CUE /group system to start, then buy our own 
if this does not work out.  Paul L and Kelvin E tell me there is no 
problem getting 5-20 GBytes on /group and setting it up so it can be NFS 
mounted by any of our computers on any JLab subnet.  My experience with 
getting /group/da and /group/halld mounted on computers on the  controls 
and DAQ networks bears this out.  They can allow mounting via explicit 
IP address, or via IP ranges, which would help minimize the number of 
times we need to ask them to add to the list.

Note that in the former case we'd be responsible for maintaining the 
computer and disks, performing backups (or arranging with the CC for 
backups), etc.  Everything is taken care of automatically in the latter 
case.

To start I propose we ask them to create /group/halldonline (suggestions 
for a better name?),  initially allocating 5 or 10 GB.  Then we can try 
mounting the new area from EEL 126, etc. and see how it works.

Comments?  Discussion?  Criticisms?

Thanks,

-- 

				Sincerely,
					Elliott
 

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 Those raised in a morally relative or neutral environment will hold
		    no truths to be self-evident.
				   

Elliott Wolin
Staff Physicist, Jefferson Lab
12000 Jefferson Ave
Suite 8 MS 12A1
Newport News, VA 23606
757-269-7365

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