[nSLUG] Power Loss and UPSs

Michael Wheadon mikeat10500 at yahoo.com
Mon Nov 5 18:41:27 AST 2007


or maybe this will work...

http://www.angelfire.com/linux/mikeat10500/stormsurf.html

 I'm lucky not smart!

--- Michael Wheadon <mikeat10500 at yahoo.com> wrote:

>
http://www.angelfire.com/linux/mikeat10500/stormsurf.jpg
> 
> 
> --- Michael Wheadon <mikeat10500 at yahoo.com> wrote:
> 
> >  We had wind,rain and even thunder but the power
> did
> > not flicker on my street in the north end of
> > Dartmouth.
> >  Nothing critical on my desktops but one has
> uptime
> > of
> > 343 days (no UPS), so I let it run. 
> >  
> > --- Jim Haliburton <jim at on-site.ns.ca> wrote:
> > 
> > > Hello all:
> > > Well it is mostly over as I write this on Sunday
> > > evening.  This afternoon 
> > > was delightful in Metro as those around here
> could
> > > see.  In my office the 
> > > power came on between 1:00pm and 2.  Am not sure
> > as
> > > I was out.
> > > 
> > > I am impressed that someone on the list has UPSs
> > > that will hold 50+ 
> > > servers up for 2 hours.  That is a lot of
> battery
> > > power.
> > > 
> > > I am not so lucky.  On Friday I picked up 3
> > gallons
> > > of fresh high test 
> > > gas for my backup generator.	Sometime after 5:00
> > > this AM I realized the 
> > > clock was not visible and as I bcame fully
> > concious
> > > could hear the 
> > > symphony of beeping coming from the server room
> > > which is almost under my 
> > > bedroom.
> > > 
> > > Scrambled madly to find the flashlight.  Threw
> on
> > > some footwear and went 
> > > and checked the status of all servers.  All were
> > > still up and running and 
> > > could see the world.  Quickly fueled the
> generator
> > > and ran the power line 
> > > to the server room.  Once the generator was
> > started
> > > connected up, the 
> > > wailing of the alarms stopped.
> > > 
> > > At this point I found the Novell server's UPS
> had
> > > run down as had my 
> > > desktop system.  I just powered the UPSs off and
> > > left them.
> > > 
> > > Some post mortem points and items about the
> other
> > > responses.
> > > 
> > > 1)  I should have fueled and test run the
> > generator
> > > on Friday.
> > > 2) I should have run the extension cord to the
> > > server room Friday as 
> > > well.
> > > 3)  Should have made sure I knew where the
> > > flashlights were last night.
> > > 4)  Really must track down the UPS control
> > software
> > > for my all my 
> > > servers.
> > > 
> > > You can apply these observations to your
> business
> > > case.
> > > 
> > > Test the UPSs before they are needed.  I know
> the
> > > Novell version of the 
> > > software I had before would allow you to under
> > > software control switch 
> > > over to battery power and monitor the life left
> as
> > > the voltage dropped.  
> > > The app ran as an NLM on the server and a
> Windows
> > > app on a workstation 
> > > talked to the NLM.
> > > 
> > > Plan ahead and decide which servers are needed
> to
> > > stay up and which can 
> > > be powered down to extend the run-time of the
> > UPSs. 
> > > I should have done 
> > > this Saturday evening.
> > > 
> > > Can virtualization allow you to reduce the
> server
> > > count in times of power 
> > > instability?
> > > 
> > > Can you move to a hot site easily if the power
> > > outage is accompanaied by 
> > > infrastructure damage that will last longer
> term. 
> > > For example if the 
> > > roof is blown off over your server room, where
> do
> > > you move to?
> > > 
> > > From this I will refresh my planning.  Even as a
> > > small web hoster I have 
> > > obligations to clients to keep running.  After
> > Juan,
> > > my little generator 
> > > ran 110+ hours without a break.  Once my ISP
> > > connection was re-
> > > established we served our clients without
> > shutdown. 
> > > And without power 
> > > from NPSI.
> > > 
> > > It would be intersting to hear from others about
> > > their post mortem of the 
> > > power outage.
> > > 
> > > Now most of my UPSs are back to 90+% fully
> > charged. 
> > > Over the next few 
> > > weeks I will test the run-time of each and start
> > to
> > > replace ones whose 
> > > run-time is less than what it should be.  With
> the
> > > low price of 
> > > relatively good capacity, I have found it seldom
> > > useful to replace 
> > > batteries.  The older UPSs are likely linear
> power
> > > supplies with large 
> > > transformers etc.  New ones are far more
> efficient
> > > and give longer run 
> > > times with the same amp hour capacity batteries.
> > > 
> > > One person mentioned putting car or truck
> > batteries
> > > in their UPSs to 
> > > extend their run time.  That may not be a good
> > > solution.  The batteries 
> > > in most UPSs are designed with slightly
> different
> > > chemistry and a 
> > > different charging plan than the batteries used
> in
> > > automotive use.  I 
> > > have found when trying this, that the automotive
> > > batteries die in a short 
> > > time from the charging that UPSs do.  In most
> > cases
> > > less than a year of 
> > > life.  It has all to do with the charging.  I
> was
> > > told that the UPS 
> > > battery uses a "float" charge.  I do not know
> what
> > > the difference is 
> > > between that and what a standard charger for
> > > automotive batteries does.
> > > 
> > > I look forward to hearing the experinces of
> others
> > > over this week-end.
> > > 
> > > Regards
> > > 
> > > Jim H
> > > 
> > > James A. Haliburton
> > > On-Site Computer Services of Halifax
> > > Suite 100, 25 Walton Drive
> > > Halifax, Nova Scotia
> > > Canada     B3N 1X6
> > > Office/ Cell           : (902)499-5250
> > > Home/After Hours : (902)477-8342
> > > e-mail      : jim at on-site.ns.ca
> > > 
> > > Please avoid sending me MS Office attachments.  
> > For
> > > an explanation see 
> > > this:
> > > http://www.nothingisreal.com/dfki/no-word
> 
=== message truncated ===


Mike Wheadon B-3715,HEMP#1
Higher Expectations for Modern Parachutists.

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