On 19/01/2016 12:33 pm, Piers Rowan wrote:
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.
sda = a usb backup drive dm-0 = / (MySQL) RAID dm-1 = / (MySQL) RAID
dm-2-5 = /home (also where VM's Live) [1 x hot spare]
Does this help at all?
Thanks for your input.
Cheers
Piers
Hi Piers I use a program called 'atop', it make seeing IO and other issues very easy. I suggest that your run this on the host and each of your guest VM. You need to find which guest is causing the IO load. Look for the line of the left with DSK, the busy number which is in % gives very good idea of the load on your disk subsystem. Also the 'avio' is a really good indication also. Mike