Updating to Debian Lenny
Last week-end, Debian Lenny 5.0 was finally released. I use Debian on most servers I manage at work. A few of them were already using Lenny when it was still the testing branch, but most are still on...
View ArticleServer migration
Since two days, I have merged the main servers used by two research laboratories at work. One server was an old Linux server which really needed a hardware upgrade, and the other one was a Mac Pro...
View ArticleImproving battery life time in Linux
Today I received a new battery for my Dell Latitude E6400 laptop. The old battery (a 6 cell one) only lasted for about 15 minutes any more, 1,5 year after I acquired this system. The new battery is a 9...
View ArticleA wise server migration
Yesterday I migrated two servers at work to a new machine. The old machines were pretty underpowered: a Pentium III 1 Ghz system (with 384 MB RAM if I remember correctly) and a Pentium 4 system. The...
View ArticleMigrating mail from KMail to Evolution
At work I am busy migrating some Linux desktop users from an old Slackware 12.0 system with KDE 3.5 to Debian Squeeze with GNOME 2.30. So I had to migrate the e-mails from KMail to Evolution, a task...
View ArticleMigrating from Microsoft SQL Server to PostgreSQL
One of the servers I manage at work is still running Microsoft Windows 2000. This system is hosting a few old forgotten web sites and it runs Microsoft SQL Server containing a few databases still in...
View ArticleDHCPd failover
Last week, I set up two dhcpd servers in a fail-over configuration. The goal is that when one DHCP server goes down, the other one takes over so that clients don’t lose their network connection. I read...
View ArticleImproving performance by using tmpfs
Today I analyzed disk reads and writes on a server with iotop and strace and found some interesting possible optimizations. With iotop you can check which processes are reading and writing from the...
View ArticleImproving Mediawiki performance
Now that I am on the subject of improving performance, I configured some performance improvements for a Mediawiki installation here: Make sure you run the latest Mediawiki version. Mediawiki 1.16...
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Debian Stretch on AMD EPYC (ZEN) with an NVIDIA GPU for HPC
Recently at work we bought a new Dell PowerEdge R7425 server for our HPC cluster. These are some of the specifications: 2 AMD EPYC 7351 16-Core Processors128 GB RAM (16 DIMMs of 8 GB)Tesla V100 GPU...
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