ISCSI enabling jumbo frames

Similar Questions

• 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

• 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.

• iSCSI without Jumbo frames for 15 Virtual Machines

  I have a physical to VME to be implemented which took the material for the SAN already purchased and resources research I see I have a HP MSA2324i table, two HP DL 380 G6 servers with two HP 2512 switches, but I found that this switch does not support jumbo frames.

  This means that I'll have to stick to the default 1 500 bytes for Ethernet iSCSI frames and I worry, how this may affect the performance of storage network.  I have migrated 15 servers, and of them, I have both SQL Server 2005 and a role of mailbox Exchange 2010 for 100 users.

  My thought is that I have a load of really light work that the SQL Server, databases don't support every 20 users and I should be able to keep these virtual machines running efficiently without the use of frames.

  Are there experiences of the V sphere 4.1 functioning when using standard Ethernet iSCSI?

  See you soon

  Kyle

  I don't have not upgraded to 4.1 yet, but we ran standard ethernet iSCSI on 3.5 for several different machines and never encountered any problems.    VSphere is out with enabled frames, but I did not notice a huge difference.   I think you'll be fine, but you should definilty keep an eye on things.

  Here's a nice blog on putting in place of iSCSI for vSphere environments, http://virtualgeek.typepad.com/virtual_geek/2009/09/a-multivendor-post-on-using-iscsi-with-vmware-vsphere.html

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• 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

• 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

• Jumbo frames

  I want to know the general thoughts on enabling Jumbo frames on my 5548 (stacked 4).  I do not use frames now on any device, but I'd like to in the future.  There has traps enabled on my switches Jumbo frames?  These stacked 4 5548 are my only switches of companies, all servers, devices and clients are running.  Thank you!  -Mark

  Here's a great article discussing the Need To Know: Jumbo frames in small networks

  www.SmallNetBuilder.com/.../30201-Need-to-Know-Jumbo-Frames-in-Small-Networks

  In general the frames are set up when connecting a switch to a storage device.  You can get a good idea if you've addressed this topic in the Forum of storage.

  Hope this helps,

• cannot ping vmk2 on other servers with jumbo frames

  I had 3 servers esxi 5.1 configure each with 2 NICs vmk - vmk1, vmk2

  vmk1 is on fabA

  vmk2 is on fabB

  the chassis is connected to the FI and the FI, its goes directly to the heart of nexus 7 k. Frames is enabled on the core switches.

  I have CoS of vmotion gold and a Qos policy of gold with the default values shown.

  the problem is each esxi host, when I try to vmkping (vmkping s 8000 vmk1 or ip vmk2), the vmk2 of another esxi host, it does not. but the fact of vmk1.

  I checked my vmnic political and especially on fabB models and they are all set to 9000.

  any ideas here?

  I ping the host local esxi itself and vmk1 vmk2

  Tony,

  One of the things to keep in mind is that traffic of FI - A IF-E passes by the upstream layer 2 network site.  Make sure the LAN past what uplink you also have enabled jumbo frames.

  David

• How to activate traffic iSCSI jumbo frames?

  Hi all

  I have my separate iSCSI coming out of a NETWORK card dedicated to one vlan traffic.

  Now, I have activated the switch to extended frames, qnas 869 pro for jumbo frames also and I (AFAIK) activated my extended frames ESXI host.

  However on the stats of the switch, I can't have counters increase jumbo frames.  others are but not huge.

  After reading all that I Although jumbo frames can help increase performance?

  So I appreciated if you could help me!

  Thank you

  Josh

  Well some how I made jumbo frames work on my ESXI host.

  I enabled frames for each unique interface on the ESXI host and on my NAS that provides iSCSI (qnap 869 pro), I enabled frames extended on both interfaces on it.

  Now it works no problem!

• 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.

• 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

• Jumbo frames based on VI3 3.5 / iSCSI initiator of material?

  Hello

  Apologies if this has already been posted. If so please point me to the thread, but I just wanted to confirm with you guys jumbo frames based on VI3 3.5.

  As much as I know frames are not taken in charge for software iSCSI but it is supported for the hardware iSCSI initiators but please correct me if I'm wrong. Now what hardware initiator you recommend for jumbo frames?

  Thanking you in advance,

  Saludos,

  Jose Maria Gonzalez,

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  In ESX 3.5, 10 gigabit Ethernet and jumbo frame are NOT supported on storage traffic (for example, the software initiator).

  In ESX 4 are supported.

  André

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• Best practices of Jumbo frames

  Hello

  I'm looking to use a pair of N3048s in a branch, as the heart of the network and for iSCSI (connected to a new equallogic).

  If I understand correctly, you can set the jumbo frames on the basis of a single port so it must be enabled on all ports.

  Will this cause a problem with the LAN network (i.e. not an iSCSI storage) that none of the devices are configured to use frames?

  Bravo for any advice,

  Huw

  It will not cause any problems. Frames allows the switch works with larger packets. If the switch receives a smaller package, it will be the leash at this size and it transmits on. If a larger packet is sent to a device that cannot receive the biggest package, then the package will be broken down into smaller.

• Jumbo Frame on 1 Gig network

  Hello

  I'm using iSCSI based shared the storage configuration on the 1 Gig host connectivity, iSCSI, physical switch software and storage.

  Should I enable the jumbo frame on all devices of connection in order to have a higher flow rate?

  It will cause no problem as the connection to the store of data or something like that?

  Kind regards

  Sushil

  Allow executives to Jumbro for the IP storage is recommended, in any case may be a glance on the following link to see a few considerations and test results on the Jumbo Frames: Jumbo Frames comparison test with storage over IP and vMotion & raquo; boche.net & #8211; VMware vEvangelist

• TSO and jumbo frames

  Hi guys

  Question: to enable frames and TSO.

  Needs active on ESX Jumbo frames, but not OSI?

  The two needs enhanced VMXnet adapter in VM and much-needed replacement NIC so it wasn't EV adapter?

  no support for iSCSI on frames?

  Also only windows 2003 entperprise (in the range of windows server familty products) supports these features?

  Thanks in advance

  See you soon

  The enhanced vmxnet (or vmxnet2) is avaible in ESX 3.5 and 4.0.

  The vmxnet3 only in 4.0

  André