[CentOS] md raid 10

Thu Mar 8 19:38:02 UTC 2012
John R Pierce <pierce at hogranch.com>

On 03/08/12 6:33 AM, m.roth at 5-cent.us wrote:
>> >  ok, so 3 x 48/64 core servers uses the same power as 6 x 4/8 core ?
>> >  thats still major win.
> Um, no - that's what I'm saying is*not*  the case. The new suckers drink
> power - using a UPS that I could hang, say, 6 Dell 1950's off of,*if*  I'm
> lucky, I can put three of the new servers. And at that, if a big jobs
> running (they very much vary in how much power they draw, depending on
> usage), even with only three on, I've seen the leds run up to where
> they're blinking, indicating it's near overload, over 90% capability.

ok, how do you figure 3 48 core modern servers are not more powerful 
computationally than 6 8 core servers?   the 1950's were "cloverton" 
which were dual core2duo chips, 2 sockets, at ~ 2-3GHz, for your 8 cores 
per 1U.

now, I dunno what your 48 core servers are, if thats really 2x12 cores 
with 'hyperthreading', then those extra threads are NOT good for intense 
numerical compute work as they share the FPU, but even those 24 cores 
should be faster than twice as many 8 core systems.

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