Can we use "Round Robin" political path active / Passive SAN?

Similar Questions

• Why not want to use Round Robin now (vSphere)?

  Given a configuration of storage fibre channel with more than one of THEM in each server (and more than one switch in the fabric) and what VMWare calls a table "active/passive" (where a single SP both "owns" a logic unit number), I saw messages in the last (see links at the bottom of this message) explaining how over time MRU can cause all of your traffic to fibre channel end on

  a single switch/HBA.

  So I wonder now because it is supported in vSphere, why I would want to use round robin for a table where vSphere uses by default a path MRU policy?  What's the downside for RR?  Is it safe (according to the docs RR is smart enough to only use 'active' paths in an active-passive array, but that is the case)?  Everybody use it now?  Alternatives that involve manually the balancing/re-balancing active links?

  These are positions that made me question initially MRU:

  • http://virtualgeek.typepad.com/virtual_geek/2009/04/understanding-MRU-behavior-in-VMware-ESX-3x.html

  • http://virtualgeek.typepad.com/virtual_geek/2009/02/are-you-stuck-with-a-single-really-busy-array-port-when-using-ESX-script-for-balancing-Multipathing-in-ESX-3x.html

  Thanks in advance.

  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
  "Now available on Rough Cuts: url = http://www.astroarch.com/wiki/index.php/VMware_Virtual_Infrastructure_Security' VMware vSphere (TM) and Virtual Infrastructure Security: ESX security and virtual environment ' [url]
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• Can definition of Round Robin way strategy - I just use the GUI?

  I have HP EVA6400 arrays and also HP XP20000.

  I use ESX 4.1 U1 and the recommendation of HP is using Multipathing Round Robin policy.

  I guess I could just use the vSphere client and select configuration > storage > datastore > properties > manage paths > Round Robin > change

  
  This approach would have certainly changed politics of this server for the selected LUN path, then repeat for each.

  But I read something on a blog lastnight that said having to perform the setting of the path of the CLI to set VMW_PSP_RR nmp esxcli.

  
  Can someone enlighten me please.

  
  Thank you

  You can use the command-line like esxcli well:

  List of devices esxcli nmp

  esxcli device setpolicy - device - psp VMW_PSP_RR nmp

• Is it possible to install oracle fail-safe-kind-of (active-passive) SAN replication for oracle?

  Dear Experts,

  Is it possible to configure replication of SAN (active-passive) integrated security for oracle for oracle?

  To get the RTO < 60 seconds

  • If the primary host fails, the remote site should have the option to start the oracle database.
  • Sites are geographically remote.

  SAN storage replication, can it be used in my scenario?

  • I have no option to implement oracle Data Guard as its very expensive.

  Is that what someone achieved something similar with SAN storage replication?

  • I have oracle SE.
  • It is obvious that the all-flash backup can be quick.

  What should be the strategy to have DR site get a few seconds, if the primary site failed for some reason any

  • Daily incremental backup with RMAN. And archive backup runs for every 1 minutes
  • To have the site of DR upward and running within 60 seconds, it still requires too much time to restore the database on remote site and have archive APPLIED setpoint
  • What could be the solution with san replication? RTO is 60 seconds

  Thanks and greetings

  SAN storage replication, can it be used in my scenario?

  I have no option to implement oracle Data Guard as its very expensive.

  --> If you want to use the data that it is free of CHARGE, additional license is not required for normal data guard

  --> additional license is only for the ADG

  Is that what someone achieved something similar with SAN storage replication?

  I have oracle SE.

  It is obvious that the all-flash backup can be quick.

  --> Here, I understand that if oraclle EA is going to be expensive

  --> Again, you can use manual standby

  --> What you are looking for SAN replication, you will need to check with the storage vendor

  --> If your intention is to check with oracle storage, then this may be the correct discussion room

  What should be the strategy to have DR site get a few seconds, if the primary site failed for some reason any

  Daily incremental backup with RMAN. And archive backup runs for every 1 minutes

  To have the site of DR upward and running within 60 seconds, it still requires too much time to restore the database on remote site and have archive APPLIED setpoint

  What could be the solution with san replication? RTO is 60 seconds

  --> If your intention is to check with oracle storage, then this may be the correct discussion room

  Check in this

  https://community.Oracle.com/community/Server_%26_storage_systems/storage

• MSA 2000 fc vSphere and round robin

  I have a number of CF 2212 G1 MSA and MSA fc storage arrays 2312 G2 connected to 4 guests, I plan to upgrade to vsphere 4.0 ESXi 3.5. They have all two controllers and are run as active/active using fixed path. Licenses have been improved under the support agreement and will be the company licenses (as opposed to companies more)

  Can I use round robin on vsphere 4 with this configuration to provide the best balance between the 2 fabrics of SAN? Does anyone else has used alternate with this type of storage? I am a little concerned do this with the MSA212fc G1 because they do not have true active/active.

  Hello

  The VMware Compatibility Guide indicates the path policy should be set except HP make you otherwise it would not be supported.

  Kind regards

  Mike

  http://blog.laspina.ca/

  http://blog.laspina.ca/

  vExpert 2009

• 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.

• Round Robin PSP

  Buenas,

  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).

  In Relación a esto, ¿habeis hecho algun cambio in los para operation IO Round Robin, monitor objetivamente showing of flow limitation?

  Por otra parte, con Round Robin, in case of caida UN camino (is corta el cable, oh), if el camino vuelve life, Robin volvera a utilizarlo para enviar comandos o ¿Round is el aislara?

  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.

  Desde mi experiencia, is can pasar a Round Robin con el limited IO operation has 1, siempre as manufacturer of the cabina datos el asi lo explains in its document of best practices.

  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

  Pablo

  P.D1: Algo of information of este tema en UN vmware kb:

  VMware KB: Setting limit Round Robin IOPS / s by default of 1000 to 1

  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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• Change the path to the Round Robin of the newest storage used

  Dear Experts,

  For one of our guests (on two hosts total), which is presented with two data warehouses:

  -Storage 1 (works with RoundRobin vmware)

  -Storage 2 (works with most recent used vmware)

  I need to know if I can change it so that things work and there are two VM in this data store 'storage 2'.

  All the foregoing gave two data warehouses are working with (Round Robin vmware) with host 2nd in our environment

  Please notify

  Just did on one of the used data stores. No problems.

  Just follow this Article

  VMware KB: Changing the path information for ESX ESXi hosts to access

• 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

• Why you should not use NMP/round robin MPIO with MSCS in ESXi &lt; 5.5?

  There, could someone explain to me why MSCS do not work well with turnstile NMP on ESXi < v5.5?  Best explanation I've seen is that each path is "seen" differently by the guest operating system continuously, send commands to reset and SCSI reservation everything slow.  No doubt this could complicate situations requiring a turnaround as well...

  Looking for a good explanation - which would also help me to understand how it "works" in ESXi 5.5 + now.

  According to Cormac Hogan:

  In the past, political path of round robin might not supported on MSCS shared storage. It was because of the inability to release SCSI reservations on some routes when the reserve has been placed on a different path on the same disk. With the release of vSphere 5.5, this problem has now been addressed and we support RR on storage that is consumed by the MSCS nodes.

  source

• DEOs change to the political necessity of round robin to restart the ESX Server

  Hi friends,

  When set politics multi-path set to Round robin, is it necessary to restart the ESX Server?

  Thank you.

  No.... You should see that paths become active after you change the setting.

  André

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