Technology

The noapic kernel parameter disables the Advanced Programmable Interrupt Controller, a useful workaround for interrupt routing issues on older or misconfigured systems.

A deep dive into why MySQL on NUMA systems suffers from unpredictable swapping, and how a single numactl interleave fix eliminates the problem entirely.

A follow-up to the original MySQL NUMA swap post, explaining why the real issue is memory pressure on a single NUMA node rather than swap itself, and outlining a three-part solution for balanced allocation in production.

Percona XtraDB Cluster can recover a crashed node and rejoin it to the cluster using an incremental state transfer. This post walks through how GTID-based position recovery works under the hood and what you will see in the error log during the process.

A quick reference for backing up and restoring full ACL permissions across an entire directory tree using getfacl and setfacl.

A quick reference for understanding the key qualifiers that appear in RAID controller error codes, so you can pinpoint the exact failure condition instead of guessing from a generic error message.