Found the cause. sync_binlog was set to 1. I suspect that the default value is 5.5 was 0 and that is has changed to 1 sometime after that.
Setting it to 0 boosted the performance back to normal (4x speed) and the HD LED indicated much lower stress on the hard disk. Found this after I found out what caused it: https://www.percona.com/blog/2009/01/21/beware-ext3-and-sync-binlog-do-not-play-well-together/ I suspect that this also apply to ext4, or? -- Jørn Dahl-Stamnes homepage: http://photo.dahl-stamnes.net/ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
