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Monitoring: better safe than sorry…
/0 Comments/in News, Tech-Blog /by flipStumbling 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 […]
Maximum volume size on DRBD
/2 Comments/in News, Tech-Blog /by flipFrom time to time we get asked things like this: I want to use a 100TiB volume with DRBD, is that supported”? The biggest public device size with DRBD known to LINBIT is currently ~600TiB. (JUNE 2019 UPDATE)
Trust, but verify
/1 Comment/in News, Tech-Blog /by flipDRBD 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 […]
DRBD and the sync rate controller (8.3.9 and above)
/2 Comments/in News, Tech-Blog /by flipThe 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.
DRBD causes too much CPU-load
/3 Comments/in News, Tech-Blog /by flipThe TL;DR version: don’t use data-integrity-alg in a production setup.
“al-extents” explained
/2 Comments/in News, Tech-Blog /by flipThere is quite a bit of confusion about the DRBD configuration value al-extents (activity log extents), so here’s another shot at explaining it.