486 reputation
1822
bio website econemon.com
location Berlin, Germany
age 34
visits member for 5 years, 7 months
seen Mar 21 at 12:34

I'm running my own startup which sells software to help companies monitor their energy consumption in detail. My programming tasks center on the Java / OSGi backend and a web-based GUI that is currently being migrated from ActionScript / Flash to JS / AJAX.


Jan
9
comment WebServer Permission problem, Ubuntu & Lighttpd
That testing procedure with find is a great idea, and will help me to more quickly debug a whole class of problems like this. I have struggled with similar issues before.
Jan
9
comment Lighttpd getting 403 forbidden page
@rvs - lighttpd does not seem to log reasons for a 403, at least not out of the box.
Jan
9
comment Lighttpd getting 403 forbidden page
Why does it need access to /var when the docroot is /var/www?
Aug
15
comment On Windows machines, what is the typical toolchain for remote maintenance?
Sounds promisingly shell-ish to this Linux guy. :)
Aug
15
comment On Windows machines, what is the typical toolchain for remote maintenance?
No cygwin - I have had my share of trouble with that - but I'll consider the other hints. Thanks!
Aug
15
comment On Windows machines, what is the typical toolchain for remote maintenance?
@John - I'll edit my question and try to be more precise.
Aug
15
comment On Windows machines, what is the typical toolchain for remote maintenance?
@Chida - I don't get to choose the OS and the machine(s) are not only used for what I put on them.
Apr
10
comment On Linux, what is a faster way than `find` or `diff -r` to see if something inside a directory has changed?
Neat. I'll give that a shot.
Feb
22
comment How do I troubleshoot an IPsec tunnel (from a cellular router to a public server)?
Thanks for the input. I'll update later with my current status.
Feb
3
comment Why does my Intel Tolapai network chip not transmit packets?
@mfinni - I suspect there's something wrong with the driver or its setup. The device is brand new and there's two Ethernet "cards" on the chip. Any idea how I can distinguish a hardware from a driver issue?
Feb
3
comment Why does my Intel Tolapai network chip not transmit packets?
I'm using the iegbe driver from intel.com/go/soc (the CentOS version). ethtool reports "Link detected: yes" on the other end, but not on the embedded system. Strangely, ethtool also can't seem to detect the speed (10/100/1000 MBit). The link LED on the Ethernet jack, however, seems to work fine.
Nov
11
comment Power and Cooling Cost compared with Server/Hardware Cost
@TomTom - Well, according to numbers cited by Google (google.com/corporate/green/datacenters/measuring.html), 2 is typical, 1.7 is "improved operations", 1.3 is "Best practices" and 1.2 is "State-of-the-art". Google says they run at 1.18.
Nov
11
comment Power and Cooling Cost compared with Server/Hardware Cost
A PUE of 2.6, sadly, is high, but not a total outlier. And what type of hardware you use for your servers is only a fraction of the story. There's plenty of stuff that you can do about how you cool the servers, and it makes a huge difference. I once listened to a talk on an IT conference where one company explained how they ran their datacenter at a room temperature of 40° C with commodity hardware and a quite unorthodox, but very professional approach to cooling.
Nov
11
comment Power and Cooling Cost compared with Server/Hardware Cost
To be accurate, a PUE of 2.6 means for every Watt going into your server, 1.6 Watt go into infrastructure and cooling. See for example google.com/corporate/green/datacenters/measuring.html
Nov
11
comment Power and Cooling Cost compared with Server/Hardware Cost
@TomTom - Having a PUE of 1.39 sadly isn't even close to common. 2 and more still seems the rule. If there's a way to share how your datacenter operates in that regard, this could probably serve as a guidance for many others.
Aug
20
comment What do local IT support personnel need from a program that addresses green computing?
Go support my site proposal at area51.stackexchange.com/proposals/15640/… to create a great site for all energy efficiency questions.
Aug
20
comment How can I shut down (power off) cluster nodes during low load?
Go support my site proposal at area51.stackexchange.com/proposals/15640/… to create a great site for all energy efficiency questions.
Aug
20
comment What have you done, as a system administrator, for ecology?
Go support my site proposal at area51.stackexchange.com/proposals/15640/… to create a great site for all energy efficiency questions.
Aug
20
comment How have you saved green by going green?
Go support my site proposal at area51.stackexchange.com/proposals/15640/… to create a great site for all energy efficiency questions.
Aug
20
comment How have you saved green by going green?
Go support my site proposal at area51.stackexchange.com/proposals/15640/… to create a great site for all energy efficiency questions.