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 😉
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 […]
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) receiver side.
The TL;DR version: don’t use data-integrity-alg in a production setup.
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 easily. Whether it’s too colorful can be discussed, though 😉 A current version can be found here, and the mailing list post is here. For correlating resource names I recommend […]