Re: killed my computer

On 2008-12-04, clare@xxxxxxxxxxxx <clare@xxxxxxxxxxxx> wrote:

[ ... ]

And somewhere in between a few good midsize dual conversions give you
the capacity for some redundancy. You ARE running redundant servers,
are you not???? What good are redundant servers if they are taken down
by the failure of une UPS??

We have 2 servers, one with redundant power supplies, one without -
with one UPS powering each power supply on the dual supply unit, while
the single power supply unit takes one UPS while the"maintenance"
workstation takes the other.

Well ... I have one serious server (a Sun Fire 280R) with dual
power supplies in the server, and in each of the two trays of Fibre
Channel drives. One side of each is plugged into the main UPS, and the
other side is plugged into the incoming AC line through a surge
suppressor only. This way, I am protected if the UPS dies, or if the
incoming power does, but not if both. The other two (smaller) BEST UPS
are only 1400 VA and 700VA and each support a single machine.

The main UPS also runs two Sun Ultra-10 machines acting as web
servers, two Sun SPARCstation 5s acting as mail servers, an Ultra 5
configured as a firewall, the Cisco router/CSU/DSU for the T1 line, and
on occasion a Mac Mini.

As for the earlier mention of the Sola style transformers in the
FERRUPS' being rather inefficient unless the system is fairly loaded --
each UPS is running about 75% of maximum, so yes, it is loaded.

Oh yes -- on the server, the tape jukebox only has one power
line, so that goes to the AC line only at present. If the power is
gone, making a new backup is not going to complete before the batteries
in the UPS get to the point where it tells the systems to shut down. :-)

But, of course, this is a private system, with no income so I
can afford to take some time to rebuild things if necessary.

Enjoy,
DoN.

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