<div dir="ltr"><div>Using <b>top </b>and looki at <b>'wa' </b>value can tell you I/O wait time for each CPU<br>Dont forget to press "<b>1</b>" to expand list of CPUs</div><div><br>Tasks: 501 total, 4 running, 497 sleeping, 0 stopped, 0 zombie</div><div>Cpu0 : 31.9%us, 52.7%sy, 0.0%ni, 15.1%id, <b>0.0%wa</b>, 0.0%hi, 0.3%si, 0.0%st</div><div>Cpu1 : 29.7%us, 7.6%sy, 0.0%ni, 62.1%id, <b>0.0%wa,</b> 0.0%hi, 0.7%si, 0.0%st</div><div><br></div><div>Also, there is handy tool called: <b>iotop </b>which can tell how much process writes and read. We can see on our 6Gpbs SATAIII interface with SSD disks, the interfaces is being maxed out with writes at ~500MBs</div><div><br></div><div>At the end 7.2k disks can be easily maxed out while running a few VMs so no surprise here.<br><br>Lastly, setup some monitoring for example munin, its quite handy :<br><br><a href="http://demo.munin-monitoring.org/disk-day.html">http://demo.munin-monitoring.org/disk-day.html</a><br><br></div><div><br></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Feb 8, 2016 at 1:58 PM Gokan Atmaca <<a href="mailto:linux.gokan@gmail.com">linux.gokan@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">> Are the disk partitions properly aligned to 4k boundary on the host (and in<br>
> the guests too) ?<br>
><br>
There are 5 in total server. 32G ram. 2T r1 (soft) disk.<br>
<br>
<br>
On Mon, Feb 8, 2016 at 9:41 PM, Zoltan Frombach <<a href="mailto:zoltan@frombach.com" target="_blank">zoltan@frombach.com</a>> wrote:<br>
> Are the disk partitions properly aligned to 4k boundary on the host (and in<br>
> the guests too) ?<br>
><br>
> See<br>
> <a href="http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.html" rel="noreferrer" target="_blank">http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.html</a><br>
> and this:<br>
> <a href="http://unix.stackexchange.com/questions/247387/check-if-partitions-are-aligned-properly-for-performance" rel="noreferrer" target="_blank">http://unix.stackexchange.com/questions/247387/check-if-partitions-are-aligned-properly-for-performance</a><br>
><br>
><br>
> On 2/8/2016 8:12 PM, Gokan Atmaca wrote:<br>
>><br>
>> Hello<br>
>><br>
>> I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very<br>
>> increases. It consumes up to 99%. For this reason, slowing down the<br>
>> other virtual machine. What should I do to solve the problem. ?<br>
>><br>
>> Thanks..<br>
>> _______________________________________________<br>
>> CentOS-virt mailing list<br>
>> <a href="mailto:CentOS-virt@centos.org" target="_blank">CentOS-virt@centos.org</a><br>
>> <a href="https://lists.centos.org/mailman/listinfo/centos-virt" rel="noreferrer" target="_blank">https://lists.centos.org/mailman/listinfo/centos-virt</a><br>
><br>
><br>
> _______________________________________________<br>
> CentOS-virt mailing list<br>
> <a href="mailto:CentOS-virt@centos.org" target="_blank">CentOS-virt@centos.org</a><br>
> <a href="https://lists.centos.org/mailman/listinfo/centos-virt" rel="noreferrer" target="_blank">https://lists.centos.org/mailman/listinfo/centos-virt</a><br>
_______________________________________________<br>
CentOS-virt mailing list<br>
<a href="mailto:CentOS-virt@centos.org" target="_blank">CentOS-virt@centos.org</a><br>
<a href="https://lists.centos.org/mailman/listinfo/centos-virt" rel="noreferrer" target="_blank">https://lists.centos.org/mailman/listinfo/centos-virt</a><br>
</blockquote></div></div>
<br>
<pre><br><font face="Verdana" size="1"><br>Mintel Group Limited | 333 West Wacker Drive Suite 1100 | Chicago, Illinois USA 60606<br><br>Contact details for our other offices can be found at <a href="http://www.mintel.com/office-locations" target="_blank">http://www.mintel.com/office-<wbr>locations</a>.<br><br>This email and any attachments may include content that is confidential, privileged <br> or otherwise protected under applicable law. Unauthorized disclosure, copying, distribution <br> or use of the contents is prohibited and may be unlawful. If you have received this email in error,<br> including without appropriate authorization, then please reply to the sender about the error <br> and delete this email and any attachments.</font></pre><br>