[LON-CAPA-admin] no SPRS, CHRT, or STAT?

[Todd Ruskell]

Doh!  I meant to say access servers.  So what your saying is if my load averages
are consistently above 1, then I should probably move to access servers.  OK,
we can do that reasonably easily.  Right now we've got 60-80 active logins,
using the system basically non-stop during class, and our 5-minute average
loads are 2+, on a hyperthreaded dual Zeon 3Ghz and 4GB ram library server.

In the meantime, what else, if anything, will break if the load goes above the
setpoint?  I know already that chart, spreadsheet, and statistics will break
for a CC.  I presume those functions will also break for students.  Do things
like the autogeneration of gnuplots, etc also get turned off?

As a slight aside: A while back I remember a discussion/request for machines to
be placed in some sort of user pool to help offload servers being hit hard.  I
must confess that I never did get around to volunteering our machine, but I see
no reason not to.  Obviously today wouldn't be good, but there are plenty of
other times when our machine, located in the mountain time zone, is
under-utilized.  Has this cross-domain load sharing been implemented?  If so,
how might we activate it for times like this?

Todd



Quoting Guy Albertelli II <guy at albertelli.com>:

> [ Charset ISO-8859-1 unsupported, converting... ]
> > Thanks Guy,
> > 
> > As I was writing the message, I slowly began to wonder about that setting. 
> 
> > 
> > As a followup, based on your experiences, at what consistent load averages
> > should I start to think about adding the two library servers?
> 
> I'd think about adding access servers first.
> 
> Get those student accesses off of the machine that the instructors are
> on.
> 
> That's what access machines are for, spreading the user load out.
> 
> At MSU, with ~800 simultaneuos logins distributed across 7 access
> servers we are not seeing load on the library server get much over 1.
> 
> Also as access servers are stupid, you don't need to worry about
> backing them up, or make them quality hardware, one them goes down,
> throw it out and stick a new one in.
> 
> -- 
> guy at albertelli.com  LON-CAPA Developer  0-7-3-2-
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-- 
Dr. Todd G. Ruskell                         Phone: 303-384-2080
Lecturer, Department of Physics             FAX:   303-273-3919
Colorado School of Mines
Golden, CO 80004