On 10/08/2010 07:15 PM, Gerald A wrote:
On Fri, Oct 8, 2010 at 4:55 PM, Andy Graybeal
<[email protected] <mailto:[email protected]>> wrote:
I'll have 2 firewalls, and 2 UPS's one for each firewall.
Each firewall will have:
1. a hot swap raid array (only two HD's set to RAID 1, mirroring).
2. two hot swap power supplies.
Is one UPS per firewall agreeable? I don't know how to do it
otherwise. I can't imagine purchasing 4 UPS's, one for each power
supply. Seems a little overkill. I welcome any input.
Plug one hotswap supply from each firewall into both of the UPS boxes
you have. That way, even if you have to service a UPS, you won't lose
a firewall. I wouldn't dedicate a UPS to
each firewall, because any UPS issue makes your bring down a box no
matter what.
True, but depending on your configuration, another way to hook this up
is to bypass the UPS for one of the power supplies on each firewall:
FW1 - Power supply 1 -> UPS1
FW1 - Power supply 2 -> straight to power grid
FW2 - Power supply 1 -> UPS2
FW2 - Power supply 2 -> straight to power grid
This way, you would still be up and running if both UPS systems fail for
some reason.
I've seen it happen! eg short circuit in a system connected to both UPS
triggering both UPS to shutdown.
(Try explaining complete power failure to your boss when all lights are
still on in the entire building ;-) )
Agreed, during power grid failure, FW1 would go down if UPS1 fails, and
FW2 would go down if UPS2 fails, but you got CARP to fix that.
Just my 2 cents.
Regards,
Hans
