CF, multipath round robin ESXi 4.1 and HP MSA1000
Hello
I'm trying to set up a path of multi round robin on the FC san to access the 1 test data store.
Our FC network is 4 GB. The ESXi server have 2 HBA must provide ~2*4Gb/s path of Round Robin selection.
But there aren't any.
By default, the configuration was MRU and one path marked as 'Active i/o' and another 'Active'.
Change to round robin, reboot, changed the limit of operation I/O 1, nothing has worked. I see in the performance graph, that a path is never used.
See the screenshots and the results of the following command.
Any ideas?
~ # esxcli nmp roundrobin methods - device naa.60060b0000839530ab5e8a224fc10023
The byte limit: 10485760
Feature: naa.60060b0000839530ab5e8a224fc10023
IO operation limit: 1
Limit Type: Ops / s
Use paths Active not optimized: false
~ # esxcli nmp ATAS methods - device naa.60060b0000839530ab5e8a224fc10023
{implicit_support =; explicit_support =; explicit_allow =; alua_followover =; {TPG_id = 2, TPG_state = AO} {TPG_id = 1, TPG_state = year}}
I can't run the commands for the other HBA device because it says that the device do not exist:
~ # ls/vmfs/devices/drives/naa *.
/VMFS/devices/disks/NAA.60060b0000839530ab5e8a224fc10023 /vmfs/devices/disks/naa.60060b0000839530ab5e8a224fc10023:1
~ # esxcli nmp roundrobin methods - device naa.60060b0000839530ab5e8a224fc10023:1
Errors:
Could not find the device with the name naa.60060b0000839530ab5e8a224fc10023:1
I'm missing something but what?
Thanks for help
Hello
Right, in the creation of 10 X 100 GB LUN then extenting considers them together is certainly NOT a recommended option. Lets take your scenario of 2 virtual machines with 100 GB VMDK, Yes this would spread the work of two controllers, but why bother. Simply create two LUNS to 100 GB with controllers of different managers, and you have reached the same goal end, more removed the complexity and potential problems in the future.
With extents, the metadata is stored on the first measure, and so when he changes (snapshot, VMDK growth, turn on/off VMs, etc.) then all of the LUNS that make up this data store get "locked". If you have something that does this too in the first measurement, then you will take on the complete data store.
Other things to think about with extents: If you lose a LUN (one of the scopes), then you lose the entire data store. Damaged metadata will take on the entire data store (all the LUNS that compose). Let's say you must remove a scope, you must destroy the whole extent, etc.. Personally, it is more flexible and easier to manage individual data warehouses, that is if you have the unit number logic that is no longer used (IOs) then you can move the virtual machines assigned to another data store.
No, I'm not saying that EVA is not able to use two controllers, just that it is not designed to have two controllers maintenance the same LUN (vDisk). Regarding the EVA, you configure the same, i.e. each LUN is assigned to another controller management and so you are balancing the full workload through both of them.
If you want a unit number logic to use all possible paths (i.e. two controllers) then you need to use Round Robin and configure it to use the non optimized paths. If your unit number logic is mainly written so you can get some benefits from that cache is reflected across both controllers, i.e. any controller made writing as well get it. However, you take a penalty (overhead) for all readings in this configuration as a request for a read on the non management controller is transmitted to the management controller. Since the vm workloads are normally random (ours is 50: 50 read/write) the gains you make on the Scriptures will be lost on read and actually exceed the delivery, i.e. latency increased, controllers overloaded, etc..
Kind regards.
Tags: VMware
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queria formular una pregunta relacionada con the caminos Round Robin balanceo politica. Por el defecto e/s operation limit of esta politica in vsphere 5 are of 1000 comandos E/S.
Hay several recommandations al respecto, sobretodo TR el trafico cabina dado por alguna VM than genere viene muchas helps in las una config del IO operation limits con bajos values (1 to 3 E / S in los detrimento 1000 comandos E/S por defecto), pueden ser mejores.
Hay of autores that defienden esa causa having into account back handicaps, como el mayor consumo procesador nuestro ESXi host para manage el traspaso los comandos por los cada tan poco tiempo o paths well cabinas that can use hidden a nivel puerto y hacerlas volver a poco Louis (hidden lately aunque a nivel puerto aren't often find in las nuevas cabinas).
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Saludos thanks
Hola compañero,
answering intento a tus dudas.
None are to change el PSP obligado a Round Robin. ES mas hacerlo sin a good reason can give problems.
VMware is select los protocolos multipathing than van a funcionar in 99.99% of cases, para 'tocarlo' hay than estar seguro what y porque is hace.
If to select el operation IO limit a 1 en PSP el, usually to experimenta UN Mayor flow acceso a esa LUN in concreto of the cabina.
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Por ultimo, if to cae UN camino, y to vuelve a recover pasado a tiempo, el alternating vuelve a usar el camino con normal. No todos los types for PSP is compartan asi (consulta P.D2 mi)
Espero ayuda sido acercado
Kind regards
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P.D1: Algo of information of este tema en UN vmware kb:
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PD2: Te perfect consultar el siguiente PSP, vale la Peña las sober vmware kb:
VMware KB: Policies of Multipathing in ESXi ESXi/ESX 4.x and 5.x
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Just did on one of the used data stores. No problems.
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http://virtualgeek.typepad.com/virtual_geek/2009/04/understanding-MRU-behavior-in-VMware-ESX-3x.html
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Hello
If you have only 2 HBA ports on your host and they are active/passive then alternating really does not benefit anyone. If you have more than 2 ports and more than 1 port zoned on the active storage processor or your San is active/active then alternating would work fine.
Best regards, Edward L. Haletky VMware communities user moderator, VMware vExpert 2009
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change the path of the fixed path selection strategy to round robin
two questions
1. is it safe to change the strategy of selection of the fixed path to round robin with the servers in the data store (round robin done work in our environment)
2 can "lost access to the volume" messages be caused by too many servers using the same path of data warehouses. Many of the servers here use a couple of paths on a fixed track, instead of all four paths on round robin. I was wondering if the lost volume messages access were caused due to heavy traffic causing data 'pulse' written in the expiration time.
1. is it safe to change the strategy of selection of the fixed path to round robin with the servers in the data store (round robin done work in our environment)
You can, but first make sure that your table provider supports this configuration.
2 can "lost access to the volume" messages be caused by too many servers using the same path of data warehouses. Many of the servers here use a couple of paths on a fixed track, instead of all four paths on round robin. I was wondering if the lost volume messages access were caused due to heavy traffic causing data 'pulse' written in the expiration time.
Check if help: VMware KB: Host Connectivity degraded in ESX/ESXi
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Hello, a few weeks ago, I found a command when issued via an SSH session, set multiple paths for all the LUNS of Round-Robin. It was a single line command that worked for all LUNS existing and new LUNS after a reboot.
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