226 reputation
17
bio website 127.0.0.1
location Australia
age 42
visits member for 5 years, 5 months
seen Jul 3 at 10:56
Pay Cheques say Software Engineer since 1992

Dec
6
comment How do you monitor a monitoring server?
I think I'm writing using psychological terms that don't mean what you think they mean. Behavioural psychology, and aviation psychology have a lot to tell system engineers. The field was developed heavily in WWII to get 18-20 year old crews to fly state-of-the art aircraft without crashing, and to still have attention left over for their real military tasks. That's why aircraft have a master caution light, not a "everything is okay" light. TLDR (I don't think that word means what you think it means)
Dec
5
comment How do you monitor a monitoring server?
Regular OK messages aren't that useful: you cannot reliably condition a person to make an action in the absence of a stimulus.
Nov
24
comment Are there any free auto-starting VM products?
phpVirtualBox is a great web front end to VirtualBox. Startup/shutdown scripts are included on their website
Nov
24
comment How to create Virtual Machine from live system?
Ouput from VMWare converter works with most VM's. I just finished virualizing an elderly server. It worked well.
Nov
20
comment Computer controlled winch
Use a thermal switch (thermostatic switch) to power an electric door striker (latch). Buy one that triggers at say 85F, attatch it to your hot rack, and the door will pop open if the power fails, for the server room overheats. BTW this is a really cool idea. The strikers normally run on 24V, so it's a wall wart, some simple wiring, the thermal switch and the striker. Strikers come in fail closed and fail open. You want fail open.
Nov
16
comment Tool to trace mac address back to a switch port
That 3Com feature was very good; CPU by port is a lifesaver sometimes too..
Nov
16
comment Disable thumb drives, but allow other mass storage USB devices on Linux
There are ugly security issues with flash based drives. They can't really be erased, or trusted to be erased. Portable HDD's on the other hand are easy to erase and securely destroy.
Nov
11
comment Power and Cooling Cost compared with Server/Hardware Cost
Guys, I used 2.6 in my example because that's about what a "datacenter" put together out of "the usual" pieces achieves. Take one industrial/office building, (make it energy inefficient; it will be) add big air conditioning (don't use an economizer, or ambient air), have lots of fluorescent lighting (which is left on), set the thermostat for 20C machine space, and you're looking at 2.6ish just like that. The last place we measured got 2.3 and is probably one of the best ones in town. If you even know what PUE is, you probably know that 1.2-1.3 is possible. Most people don't.
Jul
26
comment What's the benefit of using “containers” in the datacenter as opposite to regular installation
Most container systems convert from air to water and have water cooling, they don't use lots of air to cool a big space. Water carries heat more efficiently than air does. Water cooling infrastructure over 1Mw or so is the same tech all thermal power stations use; and very mature and efficient, of and it scales.
Jan
20
comment Datacenter Power requirements. A=W/V… I must be doing something stupid
PFO, your numbers seem right for the US. (The company I work for makes electrical load analysis software and these are very familiar numbers) Gruff, your problem is going to be cooling, and Twin 32A-3phase supplies :)
Nov
20
comment How to prevent TCP connection timeout when FTP'ing large file?
clever, sneaky solution
Nov
20
comment Anti-static wrist straps: are they worth it?
Please read esda.org/esd_fundamentals.html
Nov
20
comment Anti-static wrist straps: are they worth it?
Charles and Knox, please go to esda.org/esd_fundamentals.html It's an industry standard backed up by millions of dollars of inspections of failed parts.
Nov
16
comment Is there a security benefit to a regular changing password policy?
Simply becuase ? please explain ! Are your systems subject to continuous third party attack? Perhaps some sort of IDS is in order instead of password changes ?
May
29
comment Does orientation affect hard drive lifespan?
Modern drives do servo (closed-loop) alignment of tracks so gravity won't matter. Changing the orientation of a worn BEARING will make a difference: see Brad Gilbert's post.
May
18
comment Synergy over a serial connection?
I've been looking at making a hardware synergy assist. would anyone be interested ?
May
6
comment Using DD for disk cloning
add a "bs=100M conv=notrunc" and it's much faster in my experience.
May
5
comment Using COM ports with Virtual Server
VirtualBox does this out of the box. VirtualServer is kinda sucky IMHO