For the past few years I have been using CrashPlan to do incremental encrypted backups for all of my family's various computers. CrashPlan offered free peer-to-peer backups, which allowed me to just specify one of my ZFS disk boxes as the target, then set it and forget it. This has been working spectacularly well,...
Recently I was tending to my fleet of personal servers and I ran into a problem which essentially took my system offline and with it a number of websites I host. After the upgrade my system did not automatically start eth0 with its assigned static IP address, only the loopback device was configured. Thankfully...
We are facing a deluge of data streaming in from countless sources and across virtually all disciplines. Data intensive sciences such as astronomy expect to collect 100 PB in 10 years from a one survey. The challenge is keeping up with these data rates and extracting meaningful information....
Summary statistics are a common way to evaluate and compare performance data. They are simple, easy to compute and most people have an intuitive understanding of them, therefore mean, median, standard deviation and percentiles tend to be the default metrics used to report, monitor and compare performance. Many of the common Load and Performance...
Ghost can be a bit CPU hungry, especially for a lightweight (single core) VPS, but all of that can me negated with a little bit of caching. Luckily Apache's mod_disk_cache makes easy work of this. Configuring the cache: First we need to enable mod_cache, mod_cache_disk and mod_expires: sudo...