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behind the scenes
DRBD Proxy 3.1: Performance improvements
The threading model in DRBD Proxy 3.1 received a complete overhaul; below you can see the performance implications of these changes.
“umount is too slow”
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
DRBD 8.4.3: faster than ever
For the people who don’t already have DRBD 8.4.3 deployed: here’s another good reason — Performance.
Change the cluster distribution without downtime
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
Raspberry Tau: a Pi cluster
The Raspberry PI is a small ARM computer (hardware specifications in wiki, outline and FAQs). Of course, you can build a cluster with it!
Backup ideas: using a double-stacked setup
Have you ever wanted to do a file based backup of your data without impacting your application, and without stopping your HA replication? Here is
Mirrored SAN vs. DRBD
Every now and then we get asked “why not simply use a mirrored SAN instead of DRBD”? This post shows some important differences.
Best Practice: Use Backup with your DRBD cluster!
We want to take an opportunity to explain LINBIT’s best practices in regards to DRBD and backup procedures.
“read-balancing” with 8.4.1+
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
LINBIT participates in the German Cloud (“Deutsche Wolke”)
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.
Monitoring: better safe than sorry…
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
Maximum volume size on DRBD
From time to time we get asked things like this: I want to use a 100TiB volume with DRBD, is that supported”? The biggest public
Trust, but verify
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
DRBD and the sync rate controller (8.3.9 and above)
The sync-rate controller is used for controlling the used bandwidth during resynchronization (not normal replication); it runs in the SyncTarget state, ie. on the (inconsistent)
DRBD causes too much CPU-load
The TL;DR version: don’t use data-integrity-alg in a production setup.
Editing the Pacemaker configuration with VIM
For people using the VIM editor I’ve got two small tips when editing Pacemaker configurations: Use syntax highlight. This helps to see unmatched quote characters
