On Tue, 19 Jan 2016 11:12:12 AM Piers Rowan via luv-main wrote:
RAM: 4.10 GB CPU: QEMU Virtual CPU version (cpu64-rhel6), 5 cores
The server is a VM on a host server that also provides http / mysql services. The host server runs cron jobs to poll the email server (importing data from mail boxes into the CRM) so - to clutch at straws - I am not sure if the host and guest are competing for the disk IO at the same time with these calls. Contrary to that is that the host server does not experience any slow downs.
The best way to see if disk IO is the problem is to run iostat. I run "iostat -x 10" as I find that if a disk is at high load for 10 seconds that usually means that there is a serious performance issue. In the top output you can see that multiple users have IMAP processes blocked on disk IO which is an indication that disk IO speed is probably the issue.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7067 clam 20 0 1771m 361m 1584 S 29.5 8.6 265:23.91 clamd 6450 kylier 20 0 19300 2828 1404 D 1.0 0.1 0:00.03 imap 6544 root 20 0 15396 1552 888 R 1.0 0.0 0:00.29 top 3848 root 20 0 78752 3024 2244 S 0.7 0.1 0:00.23 auth 6398 vickij 20 0 18528 2072 1400 D 0.7 0.0 0:00.48 imap 6419 uuu.s 20 0 18524 2024 1388 D 0.7 0.0 0:00.42 imap 6424 uuuu 20 0 19300 2812 1404 D 0.7 0.1 0:00.23 imap
-- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/