Jumbo Frame (MTU) option is missing on vSwitch (vSphere Client)

Similar Questions

• MTU precedence between Portgroup and Vswitch Standard

  I have a simple question to realitvly. The situation that I was asking about is - it. There is a standard vswitch with MTU value 1500 and a portgroup to ISCSI software adapter on the same vswitch with MTU value 9000 (jumbo frames). The setting on the vswitch would lead executives to be cut level vswitch or which occur at the level of the physical switch?

  Fragmentation is supported only on the IP layer. There is just no fragmentation at the level of the Ethernet (Layer 2), so if an IP base card sends a packet larger than the MTU of 1500 bytes supported by the vSwitch or the physical switch, he fell silent.

  If you configure an adapter on your host computer to support jumbo frames Ethernet switches must also be configured to support the same MTU.

  Concerning

• Jumbo frames, change the MTU size without VM guest tension

  I'm trying to disable jumbo frames, specifically to change the size of the mtu to 1500 (instead of 9000) in vcenter on some hosts. Some hosts run esxi 4.1, others are running esxi 5.0. I wonder if it is absolutely necessary to turn off the virtual machines that are connected to the iscsi san network while making this change, or is it relatively safe to make this change, while VMS are running.

  Each VM has active multipathing, 2 vswitches with 1 NIC associated with each.

  I know how to make the changes, regarding my questions whether it is possible to safely make changes while VMS still access the SAN.

  Yes, it is something that I do in my lab quite frequently without using maintenance mode. Memaad notes, maintenance mode is always preferable to avoid unnecessary risks, but it's finally to you.

  See you soon.

• VMware ESXi4.1 with Jumbo Frames on iSCSI (how to install?)

  Hello

  I've read various articles relating to ESXi 4.1 and frames. They all pretty much say the same thing. I'm having some trouble understanding step 3 in the section "Creating a Jumbo Frames - enabled VMkernel interface" in the link below. Could break you the order for me?

  http://KB.VMware.com/selfservice/microsites/search.do?language=en_US & cmd = displayKC & externalId = 1007654

  Step 3 says: to create a VMkernel connection with Jumbo Frame support, run the command:

  esxcfg-vmknic - a-i

  My stacked switches cisco 3750G are configured for frames.

  Thank you all. This is my first post.

  Mike

  Assuming you want to create a vSwitch separated with NIC dedicated to iSCSI traffic, you should do this:

  1.) create a new virtual switch, i.e.

  esxcfg-vswitch - an iscsi switch

  2.) enable Jumbo on this virtual switch, i.e.

  esxcfg-vswitch - m 9000 iscsi switch

  3.) create a port for the VMkernel module group

  esxcfg-vswitch - a GRPE-iscsi iscsi-switch ports

  4.) create VMkernel. You must specify an IP address for use with the VMkernel, and a network mask and the MTU size, i.e.

  esxcfg-vmknic - a-i 192.168.100.1 - n 255.255.255.0 m 9000 iscsi-portgroup

  5.) associate a physical NETWORK card with the new switch, i.e.

  esxcfg-vswitch - L VMNIC5 iscsi switch

  You must run the command-line jumbos steps since there is no GUI Option - at least none that I'm aware off the coast.

• Airport Extreme Gigabit Ethernet and Jumbo frames

  Hi all.

  Can anyone support me kindly about Gigabit Ethernet & Jumbo Frames with Airport Express?

  I currently have and use a 5th generation Airport Express and you want to buy the QNAP TS - 453 Pro NAS. In any implementation of storage NAS, Gigabit Ethernet, the frames extended as matching Ethernet card well, are all very important to achieve broadband performance, so my questions are:

  5th generation Airport Express

  
  

  • Are the NETWORK Gigabit NIC Ethernet card?
  • It also works with extended frames (QNAP NAS supports 4074, 9000 and 7418 bytes for MTU)?
  • QNAP can trunk NIC (if more then one) with the following options:
    • IEEE 802.3ad (dynamic link aggregation)
    • Balance-tlb (Adaptive Transmit Load Balancing)
    • Balance-alb (Adaptive Load Balancing)
    • others (mainly for failover)

  Is 5th generation Airport Express enough or should I think about moving to the 6th generation?

  Thank you.

  You mix up the terminology... Express and Extreme are totally different.

  The title is correct... Extreme... your question text replaces by Express... they are only 10/100... and gen only 2 of them.

  Any airport extreme Gen2 - Gen6

  Use the Gigabit ports.

  Do not support jumbo frames

  Do not support pairing.

• iSCSI Flow Control vs Jumbo Frames

  It seems with my setup (HP 1800 - 24G switches) I'll have to choose between two frames of flow of GOLD for iSCSI san access control. I am running of frames with a MTU of 9000 bytes. Enabling flow control in addition to yields close to zero rate transfer jumbo frames, so I guess that its not supported by ProCurve 1800-24 G.

  Which option would you recommend to improve the performance of a 2 esx Server (HP DL380G5 ESX 3.5 U2), 1 san installation (HP MSA 2012i, two controllers)?

  Virtualized applications include databases (SAP, Exchange) aswell as moderate use fileserver (actions of the user, company documents).

  I have read other threads on this topic but did not come to a clear conclusion.

  Best regards, Felix Buenemann

  the 1800-24 has a size of 500KB packet buffer.  The specs don't say if this is by port or chassis however since 1800-8A 144KB of buffer space I guess it's chassis, it is not very good news for iSCSI.

  If you have not enough space buffer per port, you can run with a loss of images during periods of high flow.  Loss of images means that TCP will re-transimt the framework and which is slow (compared to normal operation).  I would choose allow control of flow on Jumbos, flow control indicate the end device to stop sending framesuntil the switch has had time to process these images.

  Ben

• The e2000 wireless router does support jumbo frames?

  I can't find (unless I missed it) and in the e2000 on how documentation set sizes of frame of reference.  Is that supported?  If so, what are the steps?

  A fact important is jumbo frames are not compatible at a speed lower than 1000 Mbps

  I think that Linksys E2000 already has Gigabit Ethernet ports.

  And I think that you can change the size of the image on the properties of the Ethernet adapter if the card is a Gigabit Ethernet card.

• EqualLogic SAN and Jumbo frames

  I can't get the jumbo frames to work on our Equallogic PS6000.  We have the following configuration PS6000-> Dell PowerConnect 6248 (bunk)-> Windows 2008 Server.

  The network cards on the SAN has been set at 9000 MTU, ports on switches are set to MTU 9216 and the NIC on Server 2008 is fixed to 9014 with active RX & Tx flow control.

  When the server connects to the SAN, newspapers account connection iSCSI target to the initiator "172.21.X.X:3260, iqn.2001-05.com.equallogic:0-8a0906-xxxxxxxxxxx-23a001a955452af6-server1" ' 172.21.X.X:49156, iqn.1991 - 05.com.microsoft:server1' managed, using the length of the standard framework.

  When I ping the SAN of Server 2008 with a shitload of 8972 bytes, it works very well.

  C:\Users\system>ping 172.21.x.x f-l 8972
  Ping 172.21.x.x with 8972 bytes of data: reply from 172.21.x.x: bytes = 8972 times<1ms ttl="255" reply="" from="" 172.21.x.x:="" bytes="8972"><1ms ttl="255" reply="" from="" 172.21.x.x:="" bytes="8972"><1ms ttl="255" reply="" from="" 172.21.x.x:="" bytes="8972"><1ms ttl="">

  Why 8972?  Told that some genius on the internet.  Any help would be greatly appreciated.

  Well we got it to work.  On Server 2008, we have Broadcom and Intel network adapters.  For our tests, we were just using the Broadcom NIC.  Properties Advanced NETWORK adapter, we initially have the value package Jumbo 9014 and it did not work.  So, we opened the Broadcom Advanced Control Suite that came with the NIC and searched and found that there are two parameters that need to be addressed.  There is a jumbo packet definition which has been set at 9014, which is what we wanted it in the advanced NIC Properties.  There is another parameter, MTU, which can be seen on the advanced NIC Properties.  It has been set at 1500.  Once we define to 9000, frames jumbo started working.  We then uncabled Broadcom NIC and wired the card NETWORK Intel and the value of frames 9014 on advanced network adapter properties.  Once we have that frame has worked on this NETWORK adapter, no other measures were needed.  If it's working now.  Thanks to everyone for their help.

• Enabling Jumbo frames on VMXNET3 adapter in Windows Server 2012

  Hello everyone on the forums of wonderful Equallogic :)

  We have a PS4100X of the virtual computer running on vSphere 5.1 EQL. Everything works very well, and we are about to migrate a VM 2012 SQL our database. I did some research on the issue of whether we should allow the frames extended on the VMXNET3 adapter in the virtual machine.

  Reading this white paper, it seems there are large performance benefits to enable jumbo frames and a few other options in the NETWORK adapter settings:

  http://en.community.Dell.com/TechCenter/Extras/m/white_papers/20403565.aspx

  Just curious as to how other people and if they saw an improvement in performance. Someone at - he had experience with this?

  Thank you

  Lee

  Frames being good or bad, is highly dependent on the switching infrastructure.   If the switches do not manage flowcontrol and frames, then performance could be worse with frames enabled.

  If the switches are not on the list certified for EQL tables, I tend to start with the standard frames, get a baseline run, then try frames gradually and do things of course worsen.

  Extended frames may provide an advantage, he will never be a huge increase, but it improves the efficiency of the network and could reduce the overhead of the processor.    Which are not mandatory for EQL iSCSI environments.

  Please check best practices with document ESX.  That can really help to maximize your performance with storage EQL.

  http://en.community.Dell.com/TechCenter/Extras/m/white_papers/20434601.aspx

  Kind regards

• How do I configure jumbo frames

  PC 3548p

  Could not find orders for frames / mtu setting?

  want to set overall n switch?

  I don't see any mention in the technical specifications for the P switch 3548 it supports Jumbo frames.  The 5500 series is the first model to offer the frames extended as a supported feature.

  Thank you

• 5524 - jumbo Frames - entire unit or only to certain ports / vlan

  Hello

  is - anyone idea, if possible to use frames only for ports specific it s?

  After enable JumboFrames, it will create a problem of common computers network traffic? I intended to create a VIRTUAL LAN to connect to the storage and r.620 (under XenServers).

  * We plan to use this unit to connect a Dell Power Vault MD3200i volumes as iSCSI offering.

  * According to our (ftp://ftp.dell.com/Manuals/all-products/esuprt_ser_stor_net/esuprt_powerconnect/powerconnect-5524_User%27s%20Guide_en-us.pdf ) switch mannual: "Activation iSCSI automatically enables Jumbo frames and allows the control of flow on all interfaces.

  Allowing the frames on the switch will allow the frames extended on all interfaces. I don't see a way on this option to activate the frames extended on a specific interface or VLAN. Allowing the Jumbo will not create any problem with common computer network traffic. If this switch is connected to another switch, it's a good idea to have some Jumbo frames enabled on the interface of switches connection also.

  Here is a white paper with some info good iSCSI.

  www.dell.com/.../Dell_EqualLogic_%20iSCSI_Optimization_for_Dell_Power_onnect_%20Switches.pdf

  See you soon

• Help understand Jumbo frames

  question.PNG

  

  I was hoping to get help in the frames of understanding. I have the following Setup in our network. If host 1 sends a frame jumbo to accommodate 2 what will happen on the switch. The SVI VLAN 10 has the MTU 9216 and VLAN 11 SVI MTU is 1518. Will the switch be fragmenting the packet to 1518 bytes when it send traffic to host 2?

  Hi Dave,.

  When a jumbo frame is only Layer 2, it will be dropped.

  When a jumbo frame is sent, it will be fragmented. (except if the df bit is set, in which case it falls)

  The display below treats in detail jumbo frames.

  https://supportforums.Cisco.com/discussion/11399941/does-Jumbo-frames-ever-get-fragmented

  Hope this helps,

  Please note the useful answers.

  Thank you.

• ISCSI enabling jumbo frames

  Hello world

  I want to just make sure I'm on the right track here.

  In theory, I should be able to enable jumbo frames 9000 on my switch and SAN without affecting guests. The scenario would be:

  • Stop all ESXi hosts
  • Reconfigure the SAN and switches to take in charge extended frames
  • Turn on ESXi hosts

  Basically, I want to make sure that the switches and SAN work correctly with change before changing anything on the hosts. Ideally, if all goes well with the hosts stable (vmkping d s 1500 x.x.x.x and turn VMs) I then change the MTU on the VMKernel ports and try again the hosts.

  Its good in theory?

  Sounds good to me, even if it is not necessary to stop the ESXi host. Stop the virtual machines should be sufficient.

  A good post on the frames: http://rickardnobel.se/troubleshoot-jumbo-frames-with-vmkping/

  André

• question of vMotion iSCSI and jumbo frames

  Hello

  I have a cluster ESXi 4.1 using vCenter and a SAN MD3200i.  I'll do an upgrade to optimize the installation, which includes the installation of four NIC ports in hosts that will be used for iSCSI.  I struggle to enable frames or not, but if I do, I just want to do for the iSCSI, at least for now.  Currently, the maps iSCSI network on the hosts and the MD3200 iSCSI connections are connected to two switches separated, although I have seven other switches in the building connected to the PC, printers, etc.  What I only turn frames on two switches that iSCSI is connected, or do I have to enable frames on all my switches?  There is a Dell 2724 and eight 6224Ps of Dell.  ISCSI is connected to the 2724 and one from the 6224Ps.

  The two switches that are connected to the iSCSI ports are not dedicated iSCSI switches; they have other devices on them, but I can only enable the frames extended globally on the switch.  Would there be any problem allowing the frames extended on the switches, otherwise all connected devices are configured for them?

  Another question about vMotion: I will create four ports on each host for iSCSI vmkernel.  Currently, there is also a port configuration vmkernel for traffic management and vMotion.  Is it possible to set up each of the four iSCSI for vMotion vmkernel channels, or should I leave it configured on the port of vmkernel management?

  Thank you!

  Sure. If you're going to enable Jumbo frames, you need to have dedicated switches for that, or a switch that may have different units MTU on their ports.

• vMotion and Jumbo frames

  Enabling Jumbo frames ever advantage vMotion traffic bad? We will migrate out of our HP EVA on Netapp Storage soon. Currently, we are a single Fibre Channel shop now, but consider using NFS on Netapp only to align virtual machines (recommendation of Netapp Professional Services to increase the speed of the mbralign of a Linux VM).

  As we will only use really based on IP storage for the storage of virtual machine production, someone suggests to go even bother to change the size of the MTU on our switches and virtual switches?

  We are currently using 4.0U1 ESX and vCenter 4.0U1 but will be upgrading to 4.1 ASAP.

  I have never heard or read something about enabling Jumbo frames for vMotion. I don't think it's even a supported configuration.

  There are docs on activation of traffic iSCSI Jumbo frames. Most say, there is no advantage to 1 GBit networks but a significant advantage for 10 Gbps networks.

  André