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18%
Beyond monitoring: Mathematical load simulation in Perl
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© kudryashka, 123RF.com
source queuing analysis tool, which I co-maintain with Peter Harding [3]. Why Queues? Buffers and stacks are ubiquitous forms of storage in computer systems and communication networks. A buffer is a type
18%
Reading and understanding database execution plans
31.10.2025
Home »  Archive  »  2012  »  Issue 12: NAS S...  » 
© Gunnar Pippel, 123RF.com
the explain plan for command in combination with the DBMS_XPLAN.DISPLAY function call (see Example 1). Example 1: Oracle Execution Plan 01 SQL> explain plan for<+>1<+> 02 2> SELECT * 03 3> FROM sales
18%
Creating RAID systems with Raider
31.10.2025
Home »  Archive  »  2012  »  Issue 12: NAS S...  » 
©Slawomir Kruz, 123RF.com
. With RAID 1 and hard disks of 320GB, the whole operation takes one and a half hours (Figure 3). You can view the logfile at any time with the raiderl command. Raider writes the current RAID configuration
18%
Monitoring virtualization environments with Nagios and Icinga
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Sergej Khackimullin, 123RF
will typically need to monitor the system load and I/O performance on Windows systems, too. The typical approach here is to use NSClient++ agents [3] and the matching server plugins: check_nt [4] or check
18%
Bottom: The new top
07.10.2025
Home »  Archive  »  2024  »  Issue 80: Threa...  » 
Lead Image © Lucy Baldwin, 123RF.com
recently by bashtop [2] [3], its more performant cousin bpytop [4], and many others [5] alongside the evergreen original top [6]. Rust-based, Bottom promises a more lightweight and highly customizable cross
18%
Open source data center virtualization with OpenNebula
30.11.2025
Home »  Archive  »  2012  »  Issue 10: Traff...  » 
SUSE or from the source code [3]. The project website provides a very exhaustive how-to. After installing the required packages and creating the OpenNebula user account, you still need to generate an SSH key
18%
Connecting dissimilar IPsec implementations
30.11.2025
Home »  Archive  »  2011  »  Issue 4: Secure...  » 
© Yuri Arcurs, 123RF.com
expects as the PSK from the password of test123. I set the encryption algorithm for the first negotiation phase to 3DES and the hash algorithm for authentication was SHA1. The setting for PFS was set
18%
Zarafa on the Univention Corporate Server
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© Andres Rodriguez, 123RF.com
and Univention In the rest of this article, I will assume you have already installed a UCS DC Master and that the machine is working properly. If needed, you can find help configuring a Zarafa setup [3] using any
18%
30.11.2025
Home »  Archive  »  2011  »  Issue 4: Secure...  » 
© 2011 PR NEWSWIRE
't out yet, but the company promises 3G/4G connectivity, "full shift" battery life, satellite-based GPS, and professional-grade accessories. Although the workplace usability for tablets is obvious
18%
Monitoring network computers with the Icinga Nagios fork
30.11.2025
Home »  Archive  »  2010  »  Issue 1: System...  » 
© Alterfalter, 123RF.com
, or disk space usage, you need to install a verbose add-on, such as NRPE [3], on each machine. The remote Icinga server will tell it to execute the plugins on the local machine and transmit the required

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