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behind the scenes
DRBD causes too much CPU-load
The TL;DR version: don’t use data-integrity-alg in a production setup.
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December 20, 2011
“al-extents” explained
There is quite a bit of confusion about the DRBD configuration value al-extents (activity log extents), so here’s another shot at explaining it.
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December 18, 2011
Make the kernel start write-out earlier
Similar to the recent post about setting the vm.min_free_kbytes value there’s another sysctl that might improve the behaviour: the dirty ratio.
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December 3, 2011
DRBD resources need different monitor intervals
As briefly mentioned in Pacemaker Explained, DRBD devices need two different values set for their monitor intervals: primitive pacemaker-resource-name ocf:linbit:drbd \ params drbd_resource=”drbd-resource” \ op
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December 2, 2011
Increase vm.min_free_kbytes for better OOM resistance
Depending on your setup and your workload (eg. within a virtual machine with little memory and much I/O) you could get into the situation that
flip
December 2, 2011
