iSCSI Multipathing - really useful?

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• iSCSI multipath vs network redundancy?

  If I have a redundant network, say a VMkernel port on a vSwitch with two VMnic, maybe Port ID load balancing and the two vmnic goes to two different physical switches and there are redundant links on all switches between the ESXi host and iSCSI SAN and it is Rapid Spanning Tree set up, and there is a kind of Etherchannel / Link aggregation on the iSCSI Server , but only a single IP address...

  Is there an advantage to configuring iSCSI multipath and let the VMkernel manage failover, rather than let the network itself, make sure that there is a path between the host and the target?

  Primary storage provider use several IP for storage NIC (in some cases two different networks).

  With the VMware multichannel modules, you are limited to only one path (at that moment) to a LUN, but the seller might have is multichannel modules, or of course, you can use LUN more have used more of paths.

  Bandwidth could be interesting with several virtual machines... or I/O loads.

  André

• Why several vmkernels for iSCSI multipath?

  I'm a little confused about the iSCSI Multipathing. What is the reason for the creation of two vmkernel interfaces and then use command line tools to link them to a new vmhba? Is it different for the use of a software iSCSI initator on a vSwitch with multiple VMNIC, connected to different physical switches?

  There is the same discussion in thread Russian vmug.

  iSCSI Multipathing is not on the trail, its about us pairs - initiators (interfaces vmk) and targets.

  If you have two targets

  • and you need to fail over only - 1 vmk is enough (NIC in Active mode / standby)
  • If you need loadbalacing
    • and you can use the aggregation of links + Hash IP - 1 vmk is sufficient (PSP is Roundrobin and NICs in active/active mode)
    • If you cannot use THE - vmk 2 are needed.

• iSCSI multipath on a distributed vSwitch?

  I read that there are problems with this and I'm pretty positive, I read that it is still not supported in one of the documents ESX4u1 (although for the life of me I can't find this text of presentation this morning).  Is this even a question?  And if so, can someone explain why exactly this is not working?

  I'm documenting a config proposed for deployment using cards dual 10GbE and I do research using iSCSI multipath and dvSwitches.  Which raises another question, on a channel 10GbE same multipathing necessary?

  
  
  -Justin

  If you are talking about the use of links in the port, then you must use conventional switches for this purpose.  It is in the notes version of vSphere

  vExpert

  VMware communities moderator

  -KjB

• iSCSI multipath with Distributed Virtual Switch error

  Ive followed the iSCSI SAN guide and have iSCSI multipathing works well with a regular virtual switch. Ive cancelled all configurations and have begun to see if I can get this working with a dVSwitch.

  I get the error "Add Nic failed in IMA"

  Someone at - it ideas?

  I recently worked on a case of iSCSI with VMware support and they mentioned a known issue with iSCSI and dVS, this is also described in the release notes, but may still have a problem. You can contact the technical support for confirmation.

  • ESX/ESXi 4.0 4.0 does not support the compatible ports with DVS binding configuration VMkernel network interface cards

  If you configure compatible with vNetwork Distributed Switch port binding NICs VMkernel, the operation fails if you enter esxcli swiscsi nic adds - n vmkx d vmhbaxx and vmkiscsi-tool - V - a vmkx vmhbaxx orders through the service console or the vSphere CLI.

  Workaround: Use only inherited vSwitch VMkernel NIC for port binding.

  =========================================================================

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  VMware vExpert 2009

  Scripts for VMware ESX/ESXi and resources at: http://engineering.ucsb.edu/~duonglt/vmware/

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• iSCSI Multipathing - interesting questions

  Hi all

  Here is the scenario, I have an ESXi4.1 environment. I had 4 servers ESXi and vCenter server. I need to configure the iSCSI. I use a NetApp box for this. I create vSwitch which I create a VMkernel port and assign an IP address that is in the same subnet as NetApp box. I give this all active vSwitch 4 network cards and then activate the s/w iSCSI initiator. I am able to communicate with the NetApp box. now the question is through which nic I am communicating to the BOX iSCSI?

  What happens if one of the this vSwitch vmnic fails?

  Can I configure the aggregation of links for this configuration with a single port VMkernel, it balances the load in this case?

  For iSCSI, I do not recommend to use the aggregation of links, but to set up the network, in the right way (and as suggested by the storage for vSphere provider) to use MPIO.

  NIC working? Generally, one for each LUN... (so more LUNS are a good idea).

  André

• iSCSI Multipathing

  This feature is in part?

  Hi John

  When you say iSCSI multipathing are you askingif initiator iSCSI s/w supports iSCSI CIDs? As other posters have said, even in iSCSI 3.5.x load balancing / redundancy is supported. One of the best plates of search (over and top the iSCSI SAN configuration guide) is "TA2213 - VMware Infrastructure 3 storage: iSCSI implementation and best practices" presented at VMworld 2008.This apron covers some details very good implementation around load balancing and path multiple configurations.

  In vSphere, we made a lot of improvements iSCSI.  For example, we have ways to set up the iSCSI initiator ESX to each port allows to establish a session to a target.  This means more paths for failover or load balancing. It is documented in the new SAN iSCSI for vSphere config guide which will be online soon.

  hope this helps

  Lee Dilworth

• Reduce the number of iSCSI Multipathing in paths

  I'm experimenting with performance iSCSI on NAS. Currently I have 4 NICs on the host and 4 NICs on the NAS. That leaves me with 16 channels for iSCSI data store. I would like to disable multipathing so I find myself with 4 paths. I would try having NIC1 on the host go on the NAS NIC1 and NIC2 on the host then goes to NIC2 on the NAS, so on and so forth. Is this possible? I saw that I could disable paths but I did anyway to say which way goes to which nic so that I might finish with 4 paths all on the same network adapter. Any help would be appreciated.

  I found that if I broke to the top of each of the 4 NIC I used for iSCSI in different subnets traffic and then set the 4 network cards on the NAS in the same subnets I could get the number of paths down to 4. However with adapter for iSCSI for the VMware software there is no way to have more than 1 NIC of the flow value. Round Robin will use only 1 NETWORK with a value of debit card while I was stuck with the help of only 25% of the potential flow of the NAS for iSCSI traffic.

• iSCSI Multipathing - each path does refer to a specific target IP address?

  Dear Experts,

  I just set up a 6.0 ESXi host and a Synology NAS ds2015xs MPIO Multipathing. On the side of ESXi, I created two dedicated VMkernel with a physical NIC adapters each and every other network cards set to unused. I then added the adapters to the software iSCSI adapter in ESXi. On the side of SIN, I configured both interfaces in the same subnet as the VMkernel adapters. I then created a target which allows multiple iSCSI sessions, add LUNS and allowed access to the target for the IQN of the ESXi iSCSI Software adapter name.

  Back on the side of ESXi, I added a static discovery entry manually adding addresses to IP of NAS devices and target IQN. After a new analysis of the storage, ESXi showed two paths to the interface of the SIN for which I entered the IP address as a static discovery entry:

  

  With this configuration, multiple paths does not--once to stop the interface on the NAS, ESXi don't miss not automatically during the second interface of the NAS. After you have added a second static discovery entry with specifying the same target, but the second IP address of the NAS, ESXi showed all four lanes - two at each interface on the NAS:

  

  With this configuration, Multipathing works as expected. If an interface on the NAS fails, ESXi will automatically use a path for the second interface.

  In fact, it makes sense. At first, I was wondering about whether it is correct that I have to manually enter each interface of the target in order to obtain the corresponding paths to it. I first thought that I just need to enter an IP address of the target and that MPIO uses a kind of magic to automatically discover the paths to other interfaces available on the NAS. Later, I saw that this is the case when using dynamic discovery instead of static discovery. However, the same dynamic discovery adds all interfaces of the SIN as entries in static discovery. Once I have delete one of these entries in the list, the corresponding paths are also deleted.

  So my correct understanding that always information path refers to the corresponding IP address of the target and that a way will stop working once the corresponding IP address is no longer available?

  Thank you

  Michael

  When you configure access to storage, it is always important to follow the recommendations of the supplier. Not only to learn how the program setup the IP configuration, but also for the way political (e.g. Fixed, MRU, Round-Robin).

  Regarding your question, many storage arrays are configured with the extra VIP (virtual IP address) or IP address of the group, which is then used to configure the target (or another) dynamic on the ESXi hosts. When an initiator connects to such a VIP or group IP, the target will respond with all of its associated IP addresses. If this isn't an option for your storage device, you must provide all the IPS target manually (as you did).

  André

• Connect the NAS (iSCSI) to vSphere using the crossover Ethernet cable

  Hello

  I have a HP Proliant DL360 G5 in a data center (housing) directly connected to the internet. To save all the VM I would fix a NAS (QNAP with iSCSI) on the server. But given that the server is connected only to a 100 Mbps switch (supplier provide only 100 Mbit) I am looking for a direct solution to enjoy better performance.

  I use on my Proliant Server internal dual port NIC (VMNIC0 and VMNIC1) and an additional port of double NC360T NIC (VMNIC2 and VMNIC3). I made two switches, with VMNIC0 and VMNIC2 vSwitch0 and vSwitch1 with VMNIC1 and VMNIC3 for redundancy. Each vSwitch has its own service with the public IP console.

  Because I would like to continue using the above configuration, it came into my mind to buy an additional network (NC110T with 1 NIC) of the card and use a crossover cable directly to QNAP NAS. The NAS has two NIC, we'll be fixed as said to the ESX and directly to the internet (to manage from outside).

  But now I don't know how to configure it. What should I do that the ESX will intervene to the NAS, and what type of IP address I need to adjust on the NAS to talk to the ESX?

  What I have to configure a vSwitch2 (with physical adapter NC110T) and a new Console of Service with a private IP address: for example. 192.168.1.1 and the card NETWORK NAS Port that connects to the ESX, I put 192.168.1.2 and then it should be possible to work with ISCSI? I can then add the storage in vSphere?

  I would really appreciate if someone understands perfectly how such things can give me an advice!

  Thank you very much

  Best regards

  Phil

  It sounds like a good plan and you have the process down to the right.

  • After the installation of the new card as you did for the first configuration, you should see additional network cards.

  • • You create a new vSwitch for the internal network segment that connects the NAS and ESX you note and add these network adapters

    • Then you create the port console and IP address on the private network

  • Now both devices may be

  • In QNAP, you create your iSCSI target or your NFS volume

  • For iSCSI you go to storage adapters - properties - add the ip address of the NAS and then close and discover

  • • This should find the paths of the target.

    • Then you go into storage and add and format the iSCSI volume

  • For NFS, you go straight to the storage and add the name address and NAS volume and turn up the volume of storage

  All storage will be visible and usable by ESX.

  Steve Puluka

  JNCIA-ER

  JNCIA-EX

  Senior network administrator

  Liberty Dialysis

  http://puluka.com/home

• iSCSI Multipathing vs just make the NICs active/active (vSphere)

  Hello

  I have 2 physical cards in my iSCSI vSwitch for dedicated and I understand that if I want to use multipathing I need to create 2 VMKernel ports, assign to each NETWORK adapter and connect them to the iSCSI initiator using the CLI interface.

  It is, what are the benefits this new management feature gives multichannel just teaming network adapters in an Active / Active configuration? The two configurations are not only as redundant ones than the others?

  Thank you

  Pete

  MPIO allows a server with multiple NICs for transmitting and receiving of I/O across all interfaces available in a compatible SAN corresponding MPIO.  If a server had four 1 GB/s network adapters and SAN had four 1 GB/s network adapters, the theoretical maximum rate would be about 400 MB/s (3.2 Gbit/s).

  Aggregation by grouping NETWORK adapters (or LACP, PAgP, 802.3ad, etc.) doesn't work the same way. Aggregation of links does not improve the throughput of a single traffic flow (a single source of communication with a single destination).  Only one stream will always travel the SAME path.

  The advantage of the aggregation of links is seen when several 'unique' streams (each with different source / destination) exist.  Each individual stream is sent down from its own available NETWORK adapter interface (computed by a hash algorithm).  Most unique feeds, most used network cards, more view aggregate throughput achieved. Aggregation of links will not improve throughput for iSCSI, although it gives a degree of redundancy.

  I hope this helps.

  Paul

• Problems with iSCSI Multipath i/o

  Hi people,

  I just started testing with ESXi 4 and hit a snag with the software iSCSI adapter and Multipath i/o.

  A bit of background reading, I understand that the storage architecture is a little different to 3.5, with the new PUBLIC service announcement.

  Anyway, here's the implementation.

  Single host ESXi 4.0

  -vSwitch1

  -Two cards of uplink physical

  -Two ports, with a VMKernel interface in each group (see attachment "Storage4 - Network.jpg'")

  -10.42.80.107 & 10.42.80.108

  -L' order of the adapter has been supplanted in the port groups while only 1 adapter is active in two groups of offices

  -Added the two interfaces VMKernel (vmk1 & vmk2) for iSCSI adapter, using the commands 'esxcli nic swiscsi.

  -Basically, everything described in the VMWare "iSCSI SAN Configuration Guide"

  Thecus R4500i iSCSI SAN

  -Two physical network adapters

  -Each physical NETWORK card has it's own IP address

  -10.42.80.200 & 10.42.80.201

  So in this configuration, I should end up with 4 paths:

  ESXi 10.42.80.107 - SAN 10.42.80.200

  ESXi 10.42.80.107 - SAN 10.42.80.201

  ESXi 10.42.80.108 - SAN 10.42.80.200

  ESXi 10.42.80.108 - SAN 10.42.80.201

  That is what I get, if I look in the "Configuration\Storage Adaptors\iSCSI software adapter" (see attachment "Storage2 - Paths.jpg'").

  But here's the problem, when I take a look in "Configuration\Storage\Devices\iSCSI Software Adaptor\Manage paths", I get only one path (see attached "Storage3 - Paths.jpg").

  Can someone help explain this? Did I miss something?

  This same configuration (servers, network cards, SAN, etc.) everything is perfect with multiple paths in ESXi 3.5

  (And Yes, I know that the Thecus ' "is not on the HCL supported, but we are only talking about standard iSCSI here, no additional Plugins storage, etc.)

  Not uber-urgent, but annoying, as this lack of multipathing would stop a vSphere deployment.

  Thank you

  Graham.

  Looking at the trace, it seems that, the table is not confirming to the specification when it sends data VPD. Let's not id NAA format. According to "spc3r23, 7.6.3.6.1 basic format of identifier NAA", the first Quartet of the NAA id can be 0 x 2, 0 x 5 or 0 x 6. However, the trace shows 0 x 9. ESX 4.0 does not have several paths to the LUN b ' cos of this. Is there a way to disable 'Page of Identification of device' on the side table.