The threading model in DRBD Proxy 3.1 received a complete overhaul; below you can see the performance implications of these changes.
This author has yet to write their bio.Meanwhile lets just say that we are proud flip contributed a whooping 26 entries.
Entries by flip
A question we see over and over again is Why is umount so slow? Why does it take so long? Part of the answer was already given in an earlier blog post; here’s some more explanation.
Recently we’ve upgraded one of our virtualization clusters (more RAM), and in the course of this did an upgrade of the virtualization hosts from Ubuntu Lucid to RHEL 6.3 — without any service interruption.
The Raspberry PI is a small ARM computer (hardware specifications in wiki, outline and FAQs). Of course, you can build a cluster with it!
Every now and then we get asked “why not simply use a mirrored SAN instead of DRBD”? This post shows some important differences.
DRBD 8.4.1 introduces a new feature: read-balancing, which is configured in the disk section of the configuration file(s). This feature enables DRBD to balance read requests between the Primary/Secondary nodes.
Deutsche Wolke (“German Cloud”) was founded to establish Federal Cloud Infrastructure in Germany. This infrastructure will provide additional legal and security protections for hosted data. No longer will small businesses be exposed to the legal risk of losing their website presence without a trial (an unfortunate reality when doing business on transatlantic clouds). The natural […]
Stumbling upon the Holy time-travellin’ DRBD, batman! blog post there’s only one thing to be said … Be strict in what you emit, liberal in what you accept[1. Thanks, Larry] is simply not true when dealing with mission-critical systems. It’s ok to be alerted on upgrading a machine because the “old, working” RegEx that did […]
From time to time we get asked things like this: I want to use a 10TiB volume with DRBD, is that supported”? The easiest way to answer things like that is to say look for yourself on the public DRBD usage page – the biggest public device size is ~220TiB, so go figure 😉 (JUNE […]
DRBD tries to ensure data integrity across different computers, and it’s quite good at it. But, as per the old saying Trust, But Verify[1. attributed either to Lenin or Kennedy] it might be a good idea to periodically test whether the nodes really have identical data, similar to the checks that are[1. or at least […]