IonHunter

Some days ago IonHunter came into the world!

IonHunter is the tool I’m actually developing to receive one of these diplomas. It’s is a software to identify biomarkers in a huge number of LC/MS runs. IonHunter is able to preprocess mass spectrometry data, to merge multiple runs of the same sample and also to correct retention time shifts to align various experiments.

The whole software is modularly designed and easy to extend with further plugins. So developers feel free to join my development!

Currently it isn’t published, but since it’s written in Java it will run on nearly all operating systems. We focused on usability and comfort for mass spec scientists, who will use the tool.

This is just a small announcement for the recently launched website, you might want to take a look at it!? (-;

Small hint for my faithful readers: Subscribe to IonHunters newsletter to stay informed and miss no release!

Presentation using two screens

Yesterday I attended a presentation of a colleague, but unfortunately during his speech the PDF viewer on his laptop crashed.

His supervisor told him to use pdf_presenter_console . Don’t know whether you’ve already heard about this tool? It’s able to display the current slide on the beamer-screen while you can see the next slide on your real screen. Generally a nice idea, but the software seemed to be a bit unstable ;-)

Anyway, I always wanted to find a solution to see some notes for a single slide while the slide is active, and today I set to work.

I searched for tools that are able to open two different PDF’s at once, I tried impressive, some vnc hacks, and so on, until I realized that there is already a smart solution on my laptop using the lightweight PDF viewer XPDF!

XPDF has a nice remote feature, if you run it like

xpdf -remote SOMEID presentation.pdf &

you can use your terminal to send some commands to the viewer. For example to go to the next slide try the following (see the COMMANDS section of XPDFs man page):

xpdf -remote SOMEID -exec nextPage

Great, isn’t it!? (if you receive the error error: "nextPage" file not found scroll down to XPDF is buggy)

I think the rest is clear, open two different XPDF-instances, one for the notes and one for the presentation itself:

usr@srv % xpdf -remote NOTES notes.pdf &
usr@srv % xpdf -remote PRESENTATION presentation.pdf &

and define some keys to scroll through the PDFs. You could use xbindkeys to bind the keys to the commands, for example I use F9 to go to the next slide and added the following to my ~/.xbindkeysrc :

"xpdf -remote PRESENTATION -exec nextPage && xpdf -remote NOTES -exec nextPage"
    m:0x10 + c:75

After running

xbindkeys -f ~/.xbindkeysrc

I’m able to go to the next slide by pressing F9 . To find the keycodes for some keys you may use xbindkeys -k or xev . Take a look at the documentation for more information (GER). Of course presentation.pdf and notes.pdf should have the same number of pages ;-)

XPDF is buggy

The -exec flag didn’t work for me, returning the following error:

usr@srv % xpdf -remote SOMEID -exec nextPage
error: "nextPage" file not found

I tried version 3.02 and also 3.03. The problem is located in the XPDF wrapper script, located in /usr/bin/xpdf . If you take a look at the contents you’ll find the following lines (in my case it’s 25ff):

while [ "$#" -gt "0" ]; do
    case "$1" in
    -z|-g|-geometry|-remote|-rgb|-papercolor|-eucjp|-t1lib|-ps|-paperw|-paperh|-upw)
        cmd="$cmd $1 "$2"" && shift ;;
    -title)
        title="$2" && shift ;;
    -m)

They simply forgot to define the -exec parameter to take an argument. So nextPage is not seen as argument for -exec and XPDF tries to find a file called nextPage that is obviously not present. To patch this you just need to add -exec like:

while [ "$#" -gt "0" ]; do
    case "$1" in
    -z|-g|-geometry|-remote|-rgb|-papercolor|-eucjp|-t1lib|-ps|-paperw|-paperh|-upw|-exec)
        cmd="$cmd $1 "$2"" && shift ;;
    -title)
        title="$2" && shift ;;
    -m)

or just use xpdf.real directly and skip the wrapper:

usr@srv % xpdf.real -remote SOMEID -exec nextPage

Since modifying files in /usr/bin isn’t a good idea I recommend to just substitute xpdf for xpdf.real in your ~/.xbindkeysrc .

That’s it for the moment, I wish you a nice presentation ;-)

Compress Google's Reader

If you are using Google’s Reader to aggregate news feeds you might have recognized that Google re-engineered its feed-reader to fit into the styles of other Google-services.

The new interface slimmed a bit and is more lightweight, but I’m arguing about the large white-spaces! Too much space is unused and to less information is presented. Such disadvantages are also discussed at other places.

First I thought I’ll get used to it, but now I decided to change it on my own. So I created a small user script for the Firefox extension Greasemonkey. Here you see the difference (click the images for larger versions):

Reader w/o modification
Reader w/o modification
Reader w/ modification
Reader w/ modification

So you see, there is less space at the top of the page and single entries got closer together. The script is available in the download section, all you need is the browser Firefox and its extension Greasemonkey. If you have both installed just click the following link to the download and Greasemonky will ask you to install my short script. That’s it for the moment ;-)

Update 22.11.2011: Updated the UserScript to support googles new layout.

Download: JavaScript: Google Reader Whitespace Remover (Please take a look at the man-page. Browse bugs and feature requests.)

Sharing a Wifi connection

Due to different circumstances I had to figure out how to share a wireless connection with some wired clients. And what should I say, that’s a very simple task ;-)

The scenario

With your notbook you are able to connect to an AP with access to the internet, but other machines within your network infrastructure don’t have access to the outside world, and you want your local machines to also use this wireless connection of your notebook. Figure 1 visualizes this use case.

The setup

First of all I have to admit I don’t know which software needs to be installed. Since I previously did some network hacks with this notebook I didn’t have to install something that wasn’t actually present, but I think you’ll need something like network-manager-gnome , dnsmasq-base and dnsmasq-utils . And of course you also need a Linux notebook (e.g. with a Debian or an Ubuntu) with wifi hardware, an AP with internet connection and a RJ45 Ethernet port on the notebook for the wired connection to other PC’s.

The first thing you should do is to connect to the AP, so your notebook will be able to access the WWW.

The next step is to connect another machine to your notebook using a network cable. This machine needs to be configured as a DHCP-client. (Since this might be any operating system of your choice I don’t describe the configuration, but most systems should already be configured correctly)

Now you have to setup a shared connection on your notebook. Right-click the network indicator icon in your systems panel (next to your clock) and choose Edit Connections…, compare to figure 2.

This will open a new window with connections you still configured. In the Wired tab click Add to install a new shared connection, see figure 3.

You’ll see another window to configure this new connection. Just give it a name like share and choose the method Shared to other computers in the IPv4 Settings tab, as shown in figure 4.

Last but not least open a terminal and add a new entry to the nat-table:

sudo iptables -t nat -A POSTROUTING -j MASQUERADE

That’s it, using this newly created connection you’re able to connect your clients behind your notebook through your wireless connection.

They are following you!

Recently there was a discussion with the privacy officer of Hamburg. He was arguing about people using Google-Analytics, but he also tracks his visitors on his public website. So are you anonymous? Of course not! Lets have a look at the why.

What's the problem?

Many webmasters analyze their website with Google-Analytics. This is a service of Google, very easy to use. All you need to do is insert a small script somewhere into your HTML-code:

<script type="text/javascript">

  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'SOME_ID']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();

</script>

This code tells the visitors browser to download a script from http://www.google-analytics.com/. That is while you visit this website, you additionally visit Google’s website in the background. Google of course recognizes this visit and knows which website you accessed. That is of course very cool for webmasters, they’ll get very detailed statistics about their visitors without any own work. Which article is favored most, should articles be published in the morning or in the evening, where do the visitors come from, how much time do they spend on the site and so on. Visitors don’t even know that Google follows them on nearly every website they visit. So Google is able to create very extensive profiles of every web user. Where do I come from? Am I interested in technical or political topics? Which videos do I like at YouTube? How frequently do I visit YouPorn? Based on my clicks it’s easy to guess my gender (shoes or cars?), my age (SpongeBob or cure), my professional (stock market news or music)… Do you have an account at Twitter? Google-Analytics also tracks user generated content. Together with some personal sites at Xing or LinkedIn or a blog at bloggers.com it’s easy to get a comprehensive profile of a single web user.

So Google is the bastard?

Oh not in the slightest! There are a lot of these companies. The previous mentioned privacy officer for examples tracks it’s users with IVW. The IVW uses a similar technique, you add a small image, a so called web bug, to your site:

<img id="ivw_pixel" src="http://heise.ivwbox.de/cgi-bin/ivw/SOMEID">

Since it is exactly 1 pixel it is not visible to the user, but your browser nevertheless loads it from ivwbox.de and so they get notified if you visit this specific website. Prominent customers are also Heise, Playboy, Xing, Ebay, Bild.de and a lot more (click the links to get some statistics). So IVW also creates extensive profiles of you! Do you really want to connect you professional Xing profile with Bild.de or Playboy? ;-)

But not enough, you know these funny pictures:

How often did you see one of these buttons today? Do you know a website that doesn’t have a like button (except mine)? Lets have a look to the HTML code:

<iframe src="https://plusone.google.com/u/0/_/+1/SOMESTUFF" allowtransparency="true" hspace="0" id="SOMEID" marginheight="0" marginwidth="0" name="SOMENAME" style="STYLE" tabindex="-1" vspace="0" scrolling="no" width="100%" frameborder="0"></iframe>
[...]
<iframe src="http://platform.twitter.com/widgets/tweet_button.html#_=ID" title="TITLE" style="STYLE" class="CLASS" allowtransparency="true" scrolling="no" frameborder="0"></iframe><script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script>
[...]
<iframe src="http://www.facebook.com/plugins/like.php?href=ID" style="STYLE" allowtransparency="true" scrolling="no" frameborder="0"></iframe>
[...]
<script src="http://www.stumbleupon.com/hostedbadge.php?s=1"></script><iframe src="http://www.stumbleupon.com/badge/embed/1/?url=ID" style="STYLE" allowtransparency="true" scrolling="no" frameborder="0"></iframe>

Wow, while we visit one single website, our browser notifies Google, Twitter, Facebook and StumbleUpon about our short visit. Crazy, isn’t it? And there are much more networks that offer such buttons. Or have a look at this picture:

Each button is loaded from foreign webservers. I hardly can see any benefit for the user or the webmaster!?

How to defend?

There is no protection, power off all your electronics and go back to the stone age! (Or get amish) Ok, that’s hard and somewhat impossible these days. But there are some possibilities to minimize the tracking.

For example some Firefox extensions like NoScript prevent your browser loading scripts from foreign servers (see Google-Analytics). But you’ll also load these buttons and iframes, because this is simple HTML. Here you need another extension like AdBlockPlus. This allows you to define rules for blocking specific content, e.g. everything that comes from facebook. But keep in mind that these companies own different domains, like facebook.com, facebook.net or fbcdn.net. And even if you think you got all of them, there are a lot more. There is also a filter list for social media stuff available at Chrome Adblock (yes, comes from Google, but does its job…). If you are not running Firefox or you don’t want to install a bunch of plugins, you can also send these request to nirvana. For example unix-guys might add lines like this to their /etc/hosts :

192.168.23.23 facebook.com

Every time your browser wants to load a script from facebook.com he sends a request to 192.168.23.23 , which hopefully doesn’t exists. Do the same for all the other profiler.

Fear?

Don’t be frightened now, but be aware! You should carefully decide what to publish about yourself and others around you. And of course take care of your privacy. Some days ago we went to Berlin for a meeting, when a colleague received a message via facebook on his BlackBerry from a friend asking what he’s doing in Berlin!? Looks like his smart-phone told facebook its GPS position without his approval!? That’s scary, isn’t it!

So think twice while exploring the world wide web ;-)

Hacking Havag

Ihr kennt vielleicht die Havag (Hallesche Verkehrs-AG)? Das ist das Verkehrsunternehmen in Halle, befördert uns zu maximalen Preisen bei dürftiger Qualität. Wie auch immer.

Das Unternehmen bietet seinen Kunden ein Widget an, mit dem man vom Wohnzimmer das Eintreffen der Bahnen an der nächstgelegenen Haltestelle monitoren kann. Das ganze nennt sich mobile@home (siehe Bild 1) und ist in Java geschrieben. Ist eigentlich eine feine Sache, man muss nicht mehr nach Bauchgefühl das Haus verlassen, wenn ja doch gerade keine Bahn kommt. Das Fenster nervt jedoch tierisch. Ich hab seit langen auf meinem Schedule einen Eintrag, der mich daran erinnert eine bessere Lösung zu finden. Heute Nacht hab ich mich nun endlich an die Arbeit gemacht.

Das Problem ist wie üblich eine geschlossene Software, keine Dokumentation für jemanden wie mich. Ja es ist Java, also wäre es ein Leichtes die Binaries zu dekompilieren, deren Projekt besteht jedoch aus >1000 Klassen (öhm overhead!) und über den rechtlichen Aspekt bin ich mir da auch nicht sicher. Aber was wird das Tool wohl machen? Es wird einen zentralen Server nach den nächsten Stopps an einer von mir gewählten Haltestelle fragen. Der Server wird dann sicherlich mit den jeweiligen Bahnen antworten. Soweit Client und Server kein kryptisches Protokoll sprechen kann ich also einfach den Netzwerkverkehr der über meine Interfaces geht mitschneiden und nachbauen. Also fix den Sniffer meines Vertrauens und das tolle Tool gestartet. Schnell wurde klar um welchen Server es sich handelt: 83.221.237.42 auf Port 20010 . Und die Sache war auch schon so gut wie gegessen als ich folgende Pakete an mir vorbei rauschen sah:

usr@srv % tcpdump -A -n src 83.221.237.42 or dst 83.221.237.42 and tcp port 20010
[...]
03:19:29.177630 IP 192.168.9.55.39453 > 83.221.237.42.20010: Flags [P.], seq 231:443, ack 108, win 35, options [nop,nop,TS val 28628068 ecr 367433884], length 212
E....2@.@.....  7S..*..N*..["..:~...#.......
...d....POST /init/rtpi HTTP/1.1
Content-Type: text/xml
User-Agent: Java/1.6.0_26
Host: 83.221.237.42:20010
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
Content-Length: 47


03:19:29.177676 IP 192.168.9.55.39453 > 83.221.237.42.20010: Flags [P.], seq 443:490, ack 108, win 35, options [nop,nop,TS val 28628068 ecr 367433884], length 47
E..c.3@.@..z..  7S..*..N*..[...:~...#.=.....
...d....c..m..getDeparturesForStopS..An der Feuerwachez
03:19:29.229795 IP 83.221.237.42.20010 > 192.168.9.55.39453: Flags [.], ack 490, win 65488, options [nop,nop,TS val 367433990 ecr 28628068], length 0
E..4..@.r.}.S..*..      7N*....:~..\\%....s......
.......d
03:19:29.234736 IP 83.221.237.42.20010 > 192.168.9.55.39453: Flags [.], seq 108:1556, ack 490, win 65535, options [nop,nop,TS val 367433992 ecr 28628068], length 1448
E.....@.r.x1S..*..      7N*....:~..\\%....h......
.......dHTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Content-Length: 1869
Date: Tue, 09 Aug 2011 01:19:29 GMT

S..9S..Soltauer Stra..eS..2011.08.09.03:46:00S..2011.08.09.03:46:00S..trueS..38150S..651S..falseS..falseS..38150:12840S..A FeuerwacheS..falseS..falsezVt..[stringl...l...ingl...
[...]

An der Feuerwache ist die Haltestelle, für die meine Anfrage raus ging, und ein POST -connect mit den Daten ...d....c..m..getDeparturesForStopS..An der Feuerwachez sieht stark nach dem aus, was ich gesucht habe. Kurz darauf kommt auch gleich die Antwort S..9S..Soltauer Stra..eS..2011.08.09.03:46:00S..2011.08.09.03:46:00S..true[..] , und tatsächlich fährt eine Linie 9 in kürze zur Soltauer Straße . Dedüm!! Der Rest ist simpel. Nur noch mit ‘nem Hexeditor (ich empfehle hexcurse) in die Pakete hinein geschaut um zu sehen was genau übermittelt werden muss (die . zwischen den Daten stehen für Zeichen, die in meinem Terminal nicht für mich sichtbar dargestellt werden können. Deren Hexadezimal-Code gibt aber Aufschluss über ihren Wert). Mit ein wenig Trial&Error ist die Geschichte vom Tisch.

Natürlich ist meine Alternative zu dem Widget für jedermann verfügbar:

Als Argument einfach die gewünschte Haltestelle angeben:

usr@srv % ./havag.pl Straßburger Weg
Frage http://83.221.237.42:20010/init/rtpi nach geplanten Stops für 'Straßburger Weg'...

 Zeit   Linie   Richtung
15:33       4   Kröllwitz
15:36       5   Bad Dürrenberg
15:42       5   Kröllwitz
15:44       S   Sonderfahrt
15:45       4   Hauptbahnhof
15:48       4   Kröllwitz
15:51       5   Ammendorf
15:57       5   Kröllwitz
16:00       4   Hauptbahnhof
16:03       4   Kröllwitz
16:06       5   Bad Dürrenberg
16:12       5   Kröllwitz
16:15       4   Hauptbahnhof
16:18       4   Kröllwitz
16:21       5   Ammendorf
16:27       5   Kröllwitz
16:30       4   Hauptbahnhof

Das Protokoll

Vielleicht hat ja jemand Lust weitere Tools zu schreiben, die die “Serverschnittstelle” der Havag benutzen. Daher hier eine kurze Dokumentation des inoffiziellen Protokolls, das mit dem Server gesprochen werden kann.

Eine Anfrage an den Server muss via HTTP-POST an 83.221.237.42:20010/init/rtpi geschehen und die folgenden Inhalte liefern:

[COMMAND]x00[LEN][FUNCTION]x00[LEN][FUNCTIONNAME]x53x00[LEN][ARGUMENT]x7A

Hierbei ist xAB das Zeichen für den Hexwert AB , LEN ist die Länge der darauf folgenden Zeichenkette. Um den Server nach den nächsten Stopps am Rennbahnkreuz zu fragen sendet man als Kommando ein c , als Funktion ein m , und die Funktion heißt getDeparturesForStop . Als Argument wird dann die Haltestelle erwartet. Die Anfrage in HalbHex sieht also wie folgt aus:

cx00x01mx00x14getDeparturesForStopx53x00x0dRennbahnkreuzx7a

und komplett Hexadezimal-kodiert:

x63x00x01x6dx00x14x67x65x74x44x65x70x61x72x74x75x72x65x73x46x6fx72x53x74x6fx70x53x00x0dx52x65x6ex6ex62x61x68x6ex6bx72x65x75x7ax7a

Als Antwort bekommt man die Abfahrtszeiten in den nächsten 60 min. Die Antwort beginnt mit einer Zeichenkette die ich nicht verstehe und vorerst nur verwerfe. Ein Eintrag für eine Bahn startet mit den Hexadezimalwerten x56x74x00x07x5Cx5Bx73x74x72x69x6Ex67x6Cx00x00x00x0D . Darauf folgen die einzelnen Informationen zu dieser Bahn. Eine einzelne Information ist wie folgt kodiert:

x53x00[LEN][INFO]

LEN gibt hier wieder die Länge der folgenden Information an, die Information selbst ist ASCII Klartext. Ein Bahneintrag wird abgeschlossen mit einem x7a (z). Folgende Daten werden übermittelt:

Linie   Endstation      Ankunft                 ???                     N       ???     ???     ???     ???     ???             Angefragte Haltestelle  ???     ???  z
91      Am Steintor     2011.08.09.02:42:35     2011.08.09.01:13:00     false   18824   0       false   false   18824:90120     An der Feuerwache       false   falsez

Das boolsche N gibt an, ob es sich um eine Niederflur-Straßenbahn handelt. Die mit ??? gekennzeichneten Felder verstehe ich (noch) nicht. Vielleicht etwas wie Wagennummer/Typ, ob es eine Verspätung gibt etc. Kann man sicher auch herausbekommen, da sie aber für mich vorerst nicht wichtig sind habe ich mich nicht weiter darum gekümmert.

Meine Beschreibungen sind natürlich alles andere als komplett, für die Korrektheit kann ich auch nicht garantieren. Vielleicht gehört das x00 vor der Längen-Kodierung auch mit zur Längenangabe und ist bei den kurzen Zeichenketten nur immer 0? Wer weiß, in der Praxis funktioniert mein Gehacktes aber (mindestens für mich) ;-)

Update: Wird getDeparturesForStop ohne Argumente gesendet, bekommt man eine Antwort mit allen Verfügbaren Stopps. (via @michas)

Damit ist also der Weg für coole neue Apps geebnet. Vielleicht hat ja jemand von euch eines dieser Smartphones (oder es findet sich ein Sponsor der mir eines zur Verfügung stellt)?

Übrigens flogen auch hin und wieder Pakete mit Inhalten wie diesem vorbei: Apache Tomcat/5.5.17 - Error report . Spricht nicht gerade für das Widget. :-P

Download: Perl: havag.pl (Please take a look at the man-page. Browse bugs and feature requests.)

WordPress WordCloud with R

These days one can frequently read about wordclouds created with R, initiated by the release of the wordcloud package by Ian Fellows on July 23rd. So here I am to put in my two cents.

I thought about creating a wordcloud of a complete blog history, so I build a script that connects to a MySQL database and grabs all published posts and pages. All articles are combined in an huge text, that, when purged from tags and special chars, is visualized as a wordcloud:

[cc lang=”rsplus” lines=”-1” file=”pipapo/R/wordpress-wordcloud.R”][/cc]

Enough code, here is the result for my slight blog:

Smart image, isn’t it? Unfortunately it takes about 30 secs to generate it, otherwise it would be cool to create such a cloud live, for example using rApache.

Download: R: wordpress-wordcloud.R (Please take a look at the man-page. Browse bugs and feature requests.)

Installing an HP ProLiant

I just installed a new server from HP, a ProLiant DL180 G6. Here are some notes about the setup.

To check the hardware status you need to install the ProLiant Support Package. Running a Debian/Ubuntu you should import the HP PSP mirror in your sources.list . It can be found here, you might include something like:

deb http://downloads.linux.hp.com/SDR/downloads/proliantsupportpack/Debian stable current/non-free

After an aptitude update you’ll find some new packages. I recommend to install hpaclui to speak to your raid-controllers and hp-health to interact with your hardware.

With hpaclui you can ask the raid-controllers for some information:

usr@srv % hpacucli ctrl all show status

Smart Array P123 in Slot 1
   Controller Status: OK
   Cache Status: OK
   Battery/Capacitor Status: OK

usr@srv % hpacucli ctrl slot=1 show config

Smart Array P123 in Slot 1                (sn: SOMESN  )

   array A (SAS, Unused Space: 0 MB)


      logicaldrive 1 (99.99 GB, RAID 1, OK)

      physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 99 GB, OK)
      physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 99 GB, OK)
      [...]

   array B (SAS, Unused Space: 0 MB)


      logicaldrive 2 (99.99 TB, RAID 5, OK)

      physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SAS, 99 TB, OK)
      physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SAS, 99 TB, OK)
      [...]

   Expander 250 (WWID: SOMESN, Port: 1I, Box: 1)

   Enclosure SEP (Vendor ID HP, Model SOMEMD) 248 (WWID: SOMESN, Port: 1I, Box: 1)

   SEP (Vendor ID SOMEVNDR, Model  SOMEMD) 249 (WWID: SOMESN)

So you get an idea of your storage.

The hp-health packages comes with a tool called hpasmcli . It’s used to query all the hardware states:

usr@srv % hpasmcli -s "SHOW"

Invalid Arguments
         SHOW ASR
         SHOW DIMM
         SHOW FANS
         SHOW HT
         SHOW NAME
         SHOW PORTMAP
         SHOW POWERMETER
         SHOW POWERSUPPLY
         SHOW SEL
         SHOW SERVER
         SHOW TEMP
         SHOW TPM
         SHOW UID

usr@srv % hpasmcli -s "SHOW POWERSUPPLY"

Power supply #1
        Present  : Yes
        Redundant: Yes
        Condition: Ok
        Hotplug  : Not supported
Power supply #2
        Present  : Yes
        Redundant: Yes
        Condition: Ok
        Hotplug  : Not supported

Both tools are very easy to use and give a great overview about the health. So I immediately developed a monitoring plugin that parses the output of those runs. I came to the point, that I wasn’t able to find some documentation about the hpasmcli tool. Most of its output was clear, but I don’t know what happens if a fan breaks. The output with working fans looks like:

usr@srv % hpasmcli -s "SHOW FANS"

Fan  Location        Present Speed  of max  Redundant  Partner  Hot-pluggable
---  --------        ------- -----  ------  ---------  -------  -------------
#1   SYSTEM          Yes     NORMAL  45%     Yes        0        No            
#2   SYSTEM          Yes     NORMAL  43%     Yes        0        No            
#3   SYSTEM          Yes     HIGH    100%    Yes        0        No            
#4   SYSTEM          Yes     HIGH    100%    Yes        0        No            
#5   SYSTEM          Yes     NORMAL  22%     Yes        0        No            
#6   SYSTEM          Yes     NORMAL  21%     Yes        0        No            
#7   SYSTEM          Yes     NORMAL  47%     Yes        0        No            
#8   SYSTEM          Yes     NORMAL  46%     Yes        0        No

So what if a fan is broken? Is it still Present and the Speed -string just changes to NONE or something like that? I send a support request to HP, but all they respond was a premium-rate number to call. Seems that my understanding of service differs from theirs. Since I don’t know how the output looks like in an error case (I don’t want to stick pencils into new machines) the plugin can’t decide whether the fans are OK. If you want to use my plugin you need to skip fan-checks until HP publishes a document with possible values. IMHO a public tool should be open source, so I can get those information on my own, or at least well documented!

Btw. HP if you read this, please include some permanent links to your web interface ;-)

Now I'm R-Blogging

Today a lot of great mails arrived at my inbox. In one of them I was reading I’ve just added your feed to the site.

Where did this mail come from?

The sender of the email was Tal Galili. He is a researcher in BioStatistics at the Tel Aviv University, very active around the internet. He also originated R-Bloggers and in this email he told me that I’m recruited ;-)

What is R-Bloggers

R-Bloggers is an aggregation of more than 200 bloggers writing about GNU’s R and some statistics/math/hacks that can be done using R. If you didn’t heard about R-Bloggers I strongly recommend to take a look at their website. I’m following this project since a while, it’s a great fusion of brainiacs! So I’m proud to have my modest R-related articles listed between them.

Btw. if you like R-Bloggers and/or have some R experiences yet you should also take a look at the ‘R’ programming Wikibook. Contributing your knowledge is greatly appreciated!

Let’s see what the future brings, happy hacking!

Rate My Po...

…sts (of course!). Yesterday I just installed a rating plugin, inspired by these stackexchange platforms.

Searching through the WordPress plugin directory didn’t make me happy. All existing plugins lack of desired features. After some tests I decided to modify UpDownUpDown of Dave Konopka. It’s a nice plugin, but still didn’t match my criteria. For example guests were not allowed to vote, there were some XHTML bugs and I didn’t like the style. So I created a patch (it’s attached..) and sent it to Dave (I don’t yet have a github account). He told me that he’ll take a look at it and might apply it to the official plugin, so if you also want to use this rating plugin with my additional features just keep the URL in mind and watch out for a new version.

The special version I’m using here right now has of course some more slight changes, to have it perfectly matched to my own blog. So you are now able to vote for articles, positive or negative, to give me a hint what my visitors like to read ;-)

I additionally installed a further page that lists my articles sorted by votes: top. So you can get a smart overview of best/worst content.

With this in mind: Happy voting! ;-)

Download: Patch: Patch for UpDownUpDown [03e9bb8017...] (Please take a look at the man-page. Browse bugs and feature requests.)