[CentOS] Emergency rescue help needed

[Dick Roth]

Les Mikesell wrote:
> Sorin Srbu wrote:
>>>> Marking words: "used" to be best? Which is the best now then? APC is
>>>> apparantely not an option as they suck bigtime IMO, so what's? Powerware and
>>>> APC are the two biggest and most wellknown UPS-manufacturers I know of.
>>> APC does make a full line of units.  Perhaps you aren't buying the right
>>> ones if they aren't serving you well.
>> I've been buying from the Smart-UPS and Back-UPS range. Those should be ok, 
>> shouldn't they?
> 
> That depends on how important it is to never fail.  If it is extremely 
> important, you might want something with redundant components like the 
> Symmetra line.  These are designed to keep working with some failed 
> components and to allow you to replace parts with the equipment on 
> bypass but still running.
> 
>  > All in all about a handfull of them. They're quite pricey... 90%
>> of them suffered some kind of a circuit board failure. Not what you'd usually 
>> expect from a UPS, rather you'd expect the battery to give up first. I bought 
>> them over a few years, so it shouldn't be a bad batch or something like that.
> 
> You might blame one or two on bad components, but this sounds like 
> something is wrong with the input power at your location.  I assume they 
> are lasting at least through the 2 year warranty period.  We have at 
> least a few dozen of them and haven't noticed any pattern of problems 
> other than aging batteries.  Are you tracking the in/out power levels on 
> the smart units to see what they have to deal with?
> 

I will vouch for the reliability of power continuity with the Symmetra 
line.  They can be configured from 2kva up to about 16kva and have 
almost complete redundancy.  I have 35 Symmetra RM and LX single phase 
units protecting network closets and labs.  I have never lost a load in 
the five or so years I've been running them.

Components do fail, especially the batteries (we always hope for five 
years, but 3-4 years life is not uncommon...the nature of the VRLA 
beast).  However, my experience with APC is that I've never worked with 
a better tech support operation.

This is my own opinion based on my experience.  I have no financial 
interest other than to protect my networks from the cost of outages.

BTW these APCs replaced banks of Best Power FERRUPSes.  That technology 
is no longer relevant in an environment that demands hot-swapability 
with no down time.

Dick


-- 
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."

                                              --Benjamin Franklin 1755