HowTo: Create sar Graphs With kSar [ Identifying Linux Bottlenecks ]

Posted on in Categories Debian Linux, fedora linux, File system, Hardware, High performance computing, Howto, Linux, Linux Scalability, Monitoring, Networking last updated December 15, 2009

The sar command collect, report, or save UNIX / Linux system activity information. It will save selected counters in the operating system to the /var/log/sa/sadd file. From the collected data, you get lots of information about your server:

  1. CPU utilization
  2. Memory paging and its utilization
  3. Network I/O, and transfer statistics
  4. Process creation activity
  5. All block devices activity
  6. Interrupts/sec etc.

sar output can be used for identifying server bottlenecks. However, analyzing information provided by sar can be difficult, so use kSar, which can take sar output and plot a nice easy to understand graph over period of time.

Google Public DNS Servers Launched

Posted on in Categories Linux, Linux desktop, Networking, News, OS X, RedHat/Fedora Linux, Sys admin, Windows, windows vista last updated December 5, 2009

Today, Google has announced the launch of their free DNS resolution service. Many ISPs and 3rd party provider such as OpenDNS snoops around or send traffic to ad servers. However, Google promises not to play with end users and send the exact response his or her computer expects without performing any blocking, filtering, or redirection that may hamper a user’s browsing experience. In other words Google will not hijacking your traffic on non-existent domain name and it will follow strict RFC standard.