converted in adapter network lost 2 Server esxi Server

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  njh1976 wrote:

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• Adding a new NETWORK adapter to the ESX Server

  I have an ESX 3.5 server that has two NIC onboard.  I decided that I will join the ESX Server to the SAN, so I need these two NICS for iSCSI.  I'm going to install a NETWORK card in the PCI - X slot.  Unfortunately, without GUI, I'm confused as to how it will work.  Can someone give me some advice on how to add a new NETWORK card?  I checked esxcfg and I don't know if that's what I'm trying to use.  Any help would greatly be appreciated.

  In the VI client, you should be able to go on the tab network management under configuration see the NIC it to add them to the correct vSwitch.

  • Kyle

• Grouping of NETWORK cards causing the ESXi to retransmit ethernet frames received.

  I had an HP Proliant DL380 G5 ESXi 5.1.0 connected to a Cisco 3750 Switch stack.

  All by performing a tcpdump on a host without a report, I discovered that he was under the bombardment with ethernet frames for the MAC address of a computer virtual located on a host across the data center. After a few brief troubleshooting, I discovered that I was able to stop those erroneous frames by disabling NETWORK adapters on my VMWare host group.
  
  I believe that in my situation when ESXi is configured to use two network cards to all frames received on vmnic0 and retransmits them on vmnic1 and vice-vesa. I experienced these symptoms when ESXi is configured for failover with an active adapter and adapter mode standby and I also experienced the same symptoms in the following load balancing configuration.
  

  
  

  Symptoms: some time after activating the load balancing, all frames Ethernet for the MAC address of a virtual computer on the affected host are broadcast on each switch port in the entire data center.
  
  Steps to reproduce:
  (1) implementation below configuration.
  (2) unplug the ethernet cable connecting vmnic1 and switch1 port gi2/0/4
  (3) run the host 1.1.1.1 EI - n - q tcpdump on any machine physics linux in the data center (don't even have to be connected directly to 1).
  Confirm there is no packet seen with the IP address of 1.1.1.1 destination
  (4) plug the cable between vmnic1 and switch1 gi2/0/4 port ethernet
  (5) wait 60 to 120 seconds
  (6) watch a burst of frames ethernet with the destination MAC address of the VM (which owns 1.1.1.1) in the output of tcpdump

  Cisco Configuration:

  hostname switch1
  !
  src-dst-ip port-channel load-balance

  !

  interface GigabitEthernet1/0/4

  Description vmnic0.host0 (NIC 1)

  switchport trunk encapsulation dot1q

  switchport mode trunk

  channel-group mode 4 on

  spanning tree portfast trunk

  end

  !

  interface GigabitEthernet2/0/4

  Description vmnic1.host0 (NIC 2)

  switchport trunk encapsulation dot1q

  switchport mode trunk

  channel-group mode 4 on

  spanning tree portfast trunk

  end

  !

  Interface Port-Channel 4

  Host0 description

  switchport trunk encapsulation dot1q

  switchport mode trunk

  spanning tree portfast trunk

  end

  
  Configuration of ESXi
  vSwitch0

  Grouping of NETWORK cards / Load Balancing: route based on IP Hash
  Grouping of NETWORK cards / failover detection network: link status only
  Grouping of NETWORK cards / notify switches: Yes
  NIC Teaming / relief: Yes
  Grouping of NETWORK cards / adapters active: vmnic0, vmnic1
  NIC Teaming / standby adapters: nothingness
  NIC adapters grouping / unused: nothingness
  Security / Promiscious Mode: reject

  Security / MAC address changes: accept
  Security / forged passes: accept

  
  #1 Virtual Machine port group
  Network label: 'Public '.

  VLAN: 27
  Grouping of NETWORK cards: all unchecked (inherited)

  #2 Virtual Machine port group
  Network label: "trunk".
  VLAN: 4095
  Grouping of NETWORK cards: all unchecked (inherited)

  VM kernel Port #1
  Network label: 'management '.
  VLAN: 2

  Grouping of NETWORK cards: all unchecked (inherited)

  VM #1
  

  OS: Windows Server 2003
  NIC 1 / adapter: Flexible
  NIC 1 / network Label: 'Public '.

  IP address: 1.1.1.1/24

  I apologize for the delay in my response.

  Unplug physically 2 cable NETWORK card on the host and configuration mirrored port on the switchport to 1 NETWORK adapter of the host, I have been able to confirm that the host VMWare issues guides on NIC1 with a destination MAC address of one of its own VM.

  After carefully reviewing the captured data, I noticed that the destination frames wrong "02:bf:cb:50:a2:76" MAC address actually belonged to "Local Area Connection 1' one of my Windows 2003 Server WHAT VM installed on the suspected host.

  Dig a little deeper, I discovered that this virtual NETWORK card is presented to the operating system as
  Name: Local 1 network connection
  "Type: VMware Accelerated AMD PCNet adapt."
  MAC: 02-BF-CB-50-A2-76

  But the configuration of the virtual machine in vCentre is
  Name: Network adapter 1
  Type: Flexible
  MAC: 00: 0C: 29:fa:e8:83

  Note the different MAC addresses.

  Digging a little further I discovered that Windows 2003 server has configured on "Local 1 network connection" network load balancing and NLB is the cause of the altered MAC address.

  Rather than to investigate further I have just placed a load balancer linux before the server windows 2003 cluster and that you turn off NLB.

  But I suspect that there is still a fundamental problem in the Virtual Switch VMware with how he learns the MAC addresses of the virtual machine is using flexible vNIC. In particular, with a virtual machine that uses a form to override the MAC address such as that used by NLB.

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  I'm a newbie VMWare test performance using 5 ESXi (free) to see if VMWare will be a satisfactory solution.  The thin hypervisor runs on a years 4u Dell with Xeons @2.66 8, 32 G ram, ethernet ports 4 gigabit ports (currently connected to ports on a cisco switch - they don't have to share their bandwidth with other machines) and 4 drives in RAID5 (450 GB).  I have 4 CentOS5 virtual machines running at the same time and I'm trying to measure the bandwidth of file transfers.  Each of the virtual machines VMware tools installed and use the 3 VMXNET network adapter.  The VMs and VMkernel are currently attached to a vswitch that is connected to an etherchannel (hash IP) two of the gig ethernet ports.  The main questions are:

  • establishing an ssh connection to a virtual computer takes about 15 + / 4 seconds of "Do you want to trust in this regard" at the password prompt
  • file transfer (scp) between the two machines is consistently 11.5 + / 1 MB/s.  This is true for the transfer of files between the virtual machines hosted on this box or any of the virtual machines and any other device on the subnet.

  Any other relevant information:

  • pings between two virtual machines: first ping about 1.4 ms and all the 0.4 Ms
  • pings between VM and another server: first ping about 2 ms and every 1 ms
  • Each virtual machine and the vmkernel use DHCP
  • There no lag once sshed in a virtual machine
  • The data store is about 1/4 full.
  • All virtual machines are thinly provisioned.
  • execution of SSH on Port IP VMkernel is instantaneous from other servers and takes about 2 seconds of a virtual machine.
  • In addition to my manual tests, there is no other traffic on the network and CPU usage and disk are minimal
  • a scp pushing a file to the virtual machine to the VMkernel quickly established, but a scp a file from the VM to the VMkernel traction expires entirely
  • While scping a single file between two virtual machines, the CPU usage goes to 75% on one heart.  All other seem unchanged.
  • hdparm - Tt/dev/sda tells me that my maximum reading speed on the RAID5 array is around 200 MB/s.  Even including the overhead associated with reading blocks and then write them on the same unit, the drive speed is probably not the bottleneck for the speeds of the scp.
  • However, cping a single large in a virtual machine file goes to about 30 MB/s - considerably less than 50% of the response of hdparm (what I was waiting for the operating system to completely load the file into RAM, wait a seektime, then réécrirait in a contiguous block), but still well above the reported by scp transfer speed.

  Thoughts:

  11.5 Mbps is strangely close to 100 Mbps - is there an artificial constraint on the free version of ESXi do max on all network connections to 100 Mbps?

  If the transfer is limited by the CPU, which seems ridiculous.  A single 2.66 Xeon is barely able to administer a file transfer of 12 MB/s via the ssl Protocol?

  Resources or ideas are welcome.  Thank you, all.

  Good job digging around.

  Number of things (IMO):

  -File copy tests should not be used to test the performance of the storage subsystem.  Launch Windows 2003/2008 1-2 VMs and get IOMeter running.  It is a sure way to put crab on your drives.  The problem with the copy of file is that there is a lot of overhead involved (CIFS, TCP/IP, file systems), IOmeter bypasses all this (except the file system) and gives you a gross rate.  Your hdparm is a good indication of good performance.

  -scp uses a lot of CPU, it's a way slow (but safe & convenient) to transfer files.

  -You look good pings, ARP can take 500-1500 ms to make a difference

  -Re: your slow ssh connections, try disabling DNS lookups that are reversed in your/etc/ssh/sshd_config (')UseDNS no')

  Ben