[CentOS] md raid 10

Thu Mar 8 20:25:30 UTC 2012
John R Pierce <pierce at hogranch.com>

On 03/08/12 11:51 AM, m.roth at 5-cent.us wrote:
> I'm sorry, but to me, the above is a non sequitur. I was talking about how
> much power the servers drink, and that the UPSs that I have can barely,
> barely handle half as many or less, and I'm running out of UPSs, and out
> of power outlets for them in such a small space (that is, a dozen or so in
> each rack), without trying to go halfway across the room.

yes, you have to budget power and A/C as part of a server upgrade.   
ain't no such thing as a free lunch.

anyways, the CPU link you sent was a 12 core, so I guess you upgraded 
from a fairly low power 2 socket Intel (said Dell PE1950) to a rather 
HIGH power 4 socket AMD (those are 120W each CPU chips, never mind the 
rest of the infrastructure, like I bet you have way over 2X the RAM in 
those new boxes).

so yes, if you replaced N 2 socket servers with the same number N of 4 
socket servers, and went from 8 to 48 cores each, of COURSE you're 
drawing more power.    you have about 6 times the CPU capacity (assuming 
the cores are equivalent MIPS, often newer cores are more efficient at 
the same clockspeed than older ones).   Most of the Xeon 5300 series in 
those PE1950s were 80 watt each (only the 2.67 and 3.0Ghz were 120W)

john r pierce                            N 37, W 122
santa cruz ca                         mid-left coast