Network Latency on Virtual Machine

Slight network latency may cause application problem  on sensitive virtual machines. Even the network responding time is just 3 or 7 ms. There is a way to improve the  stability of responding latency – Enable RSS on NIC.

Network traffic is handled by single CPU core when RSS is disabled. Enable it will distribute the workload to 4 cores by default. You can increase CPU for RSS by change registry.

To summarize the solution. Go to Device Manager -> NIC properties -> Advance -> Find RSS option  and enable it. You will see 2 – 3 network drops when applying it.

You can refer following articles for detail.

Poor network performance or high network latency on Windows virtual machines

Virtual Receive-side Scaling in Windows Server 2012 R2

Regarding increase CPU for RSS. Read following article to learn how to modify it.

Setting the Number of RSS Processors


vRealize Operation Manager Installation Pending on

If your company implemented firewall and blocked public NTP server, you may see installation of vRealize Operation Manager pending on ./ on console. That’s because the installer tries to negotiate with NTP server The firewall blocked the traffic.

VMware TAM Manager Shan told me  there are two options on firewall to block traffic: REJECT and DROP. REJECT means firewall responding to the request and let source device knows it’s rejected. DROP means firewall immediately ignores the request and no responding to source device. Looks like there is a bug in vROPs code that it hung if NTP request gets drop and no responding.

The workaround is create a port group without physical uplinks and install vRealize Operation  Manager. Then move it to proper network after installation  is completed. You can configure correct IP addresses when import the OVF file so later on you just need simply move the network.

Flash menu appears when right click on vSphere Web Client in Chrome

There is a KB describes how to fix right click issue in IE on vSphere Web Client. But my problem was in Chrome. I searched a lot in internet but no lucky till today.

The problem was flash menu appears when I right click anything in vSphere Web Client in Chrome. I have two computers that both has Chrome installed but one has issue, other one works fine. I compared version of Chrome, noticed working one was 55.x, problematic one was 49.x. The issue gone after upgraded to 57.x.

After dig into that problem, looks like Google fixed the problem on version 54.0.2840 that there was a bug related to right click. Check out release notes here.


My New Toy Raspberry Pi 3

I own Raspberry Pi 1 and 2 both. I used to do some small projects and learn Python on its. It’s great computer to learn scripting and Linux. But not something can be used in daily based.

I was excited when I hear Raspberry Pi foundation released Pi 3. Thanks foundation brought our world a powerful, cheap and flexible computer that can replace my laptop. In general, I think Pi 3 can be used for daily work in GUI interface. It comes with embedded WiFi, Bluetooth and quad-core 1.2GHz CPU! It frees up the 4 USB ports so I can use it for other purpose.

I have a laptop that motherboard was dead, screen still works. So I bought driver board for the LED screen. Connected Pi 3 to the driver board by HDMI cable. The official Pi 2 case is compatible with Pi 3 except power LED in the other side. I use the latest OS “RASPBIAN JESSIE WITH PIXEL“. I have to say the graphical interface is awesome! It’s more like a modern, real computer. I use default browser Chromium which is similar with Chrome PC version. I also installed “Google Input Tool” extension on Chromium so I can input Chinese. Since most of my work on websites so I don’t have to install input tool on OS. And I saw some interface problem when use Chinese input tool for Linux. I also tried bluetooth headset, not working well. So I turned to USB headset, it works perfectly.

I opened 10 more tabs in Chromium just like how do I use my PC. I also ran a online website to streaming music to USB headset. Wrote blog, brows photos, edit files…etc. I didn’t see any performance issue so far. I guess my high performance TF card may helped. I bought Samsung 64GB UHS-1 Class10 for my Pi 3.


vSphere Data Protection将停止更新

VDP在未来的vSphere版本中将不再继续更新。在2022年以前对于现有的VDP客户没有影响。如果客户想迁移到其他备份方案,VMware提供限定时间内的免费迁移至Dell EMC Avamar Virtual Edition的促销。客户依旧可以通过vCenter的存储API把第三方备份解决方案和vCenter整合。