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18%
All you ever wanted to know about hard drives but never dared ask
16.05.2013
Home »  Archive  »  2013  »  Issue 13: IPv6...  » 
Lucy Baldwin, 123RF
capacity. The results benefit mostly sustained read performance, with other benchmarks seeing limited effect. More expensive enterprise hard drives reach as high as 15,000rpm, reducing latency to half
18%
Secure email communication
03.02.2022
Home »  Archive  »  2022  »  Issue 67: syst...  » 
Photo by Simon Moog on Unsplash
authorized outbound mail servers. Although designed in 2004, SPF only became the standard recommended by the Internet Engineering Task Force (IETF) in 2014 [2]. From a sample of more than 3,000 domains
18%
File Integrity Checks with AIDE
04.12.2024
Home »  Archive  »  2024  »  Issue 84: Non-R...  » 
Lead Image © rudall30, 123RF.com
in the configuration. To prepare the AIDE database with the current status, trigger the database init with the command: aide --init In our lab, this took north of one and a half minutes for around 318,000 files. AIDE
18%
Law of Averages – Load Averaging
01.02.2013
Home »  Articles  » 
 
at the output of uptime [1] on OS X:   13:03 up 2 days, 12:01, 2 users, load averages: 0.52 0.59 0.63   The uptime command displays the load average in its common form, averaging the last one, five, and 15
18%
Improved Performance with Parallel I/O
24.09.2015
Home »  HPC  »  Articles  » 
that is 80% parallelizable (20% is serial, primarily because of I/O). For one process, the wall clock time is assumed to be 1,000 seconds, which means that 200 seconds is the serial portion of the application
18%
System Logging for Data-Based Answers
25.01.2018
Home »  HPC  »  Articles  » 
2,400 lines of stats (one for each core). If you have 100 nodes, in one minute you have gathered 24,000 lines of stats for the cluster. In one day, this is 34,560,000 lines of stats for the 100 nodes
18%
Why Good Applications Don’t Scale
13.10.2020
Home »  HPC  »  Articles  » 
be parallelized). For one process, the wall clock time is assumed to be 1,000 seconds, which means that 200 seconds of the wall clock time is the serial portion of the application. From Amdahl’s Law, the minimum
18%
What is an IOPS Really?
24.02.2022
Home »  HPC  »  Articles  » 
B? Most of the time, IOPS are reported as a plain number (e.g., 100,000). Because IOPS has no standard definition, the number is meaningless because it does not define the payload size. However, over time
18%
Scalable mail storage with Dovecot and Amazon S3
10.04.2015
Home »  Archive  »  2015  »  Issue 26: OpenS...  » 
Lead Image © Vlad Kochelaevskiy, Fotolia.com
EUR5,000 per year for 10,000 mailboxes. Admittedly, that is not exactly cheap, but the number has little meaning. Figure 1: The license for the S3 plugin
18%
Why Good Applications Don't Scale
02.02.2021
Home »  Archive  »  2021  »  Issue 61: Secur...  » 
Lead Image © man64, 123RF.com
cannot be parallelized). For one process, the wall clock time is assumed to be 1,000 seconds, which means that 200 seconds of the wall clock time is the serial portion of the application. From Amdahl's Law

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