5 Nov
2015
5 Nov
'15
12:35 p.m.
From: Ulrich Windl Sent: Wednesday, November 04, 2015 11:26 PM
Maybe you have an I/O bottleneck? Could you try (for a test) to put the accesslog into a RAM disk? What filesystem are you using? Special mount options?
Yes, I'm pretty sure it is an I/O issue. The problem only occurs on the physical servers, the virtual machines (which are on a SAN with much better performance than local disks) don't exhibit this issue. While it is thrashing iotop shows the write load at about 2MB/s. It's on a linux system using ext4, the only special mount option is relatime.