Wu's Blog

Tag: network

  • vRealize Operation Manager Installation Pending on install.sh

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    If your company implemented firewall and blocked public NTP server, you may see installation of vRealize Operation Manager pending on ./install.sh on console. That’s because the installer tries to negotiate with NTP server www.iana.org. The firewall blocked the traffic. VMware TAM Manager Shan told me  there are two options on firewall to block traffic: REJECT…

  • Slow network performance on a virtual machine

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    It’s been a while since last technical post. I was pretty busy on preparation of holiday maintenance plan as well as few problems in virtual environment. There was one I’d like to share as it’s a sample to show how to ‘touch’ hardware layer from virtual layer. 🙂

  • Blue Screen with Bug Check 50 on ESXi 5.x

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    Some critical VMs got blue screen in last few weeks. After working with OS and hardware vendor, we figured out the root cause eventually. It’s a CPU problem related to Intel v2 CPU of E3, E5 and E7 families. The detail information is documented in VMware KB Windows 2008 R2 and Solaris 10 64-bit virtual…

  • Receive Side Scaling on UCS Blades

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    To implement enterprise application like SAP, Oracle or SQL on UCS virtualization environment. Default setting of UCS blades may not suitable for the application. We always expect highest performance by optimize hardware and ESXi. In my UCS training session, I noticed one “hidden” parameter may helpful for performance. Receive Side Scaling – So called RSS,…

  • Error: No NIC found with MAC address…

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    Your HP server may runs fine on ESXi 4.x or 5.0, but you may get error message No NIC found with MAC address xx:xx:xx:xx:xx:xx after upgrade to ESXi 5.1 or later. That’s caused by network adapter firmware, you have to upgrade server network adapter firmware by HP SPP 2013.02 or later. I would recommend you…

  • Port Groups not Work with VLAN Tag on Cisco Switch

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    Few weeks ago, I tried to standardize networking of a cluster, there were 4 VLANs for production virtual machines, I binded the VLANs on one virtual switch which had 4 physical vmnic. Then I created 4 port groups with different VLAN ID, but for some reason virtual machines unreachable via some vmnics. Network team verified port channel…