To better understand the SRM

Hello

We have 2 sites, each site, we have 4 ESX servers and on each site, we have a Clariion CX380 but everything is run by a single Virtual Center. All ESX servers are on the same VC data center. Finally, we have 2 physical sites that we have succeeded in one site.

I know with the MRS, we need two VCs, one on each site, but we need two data centers in VirtualCenter? Why I ask this question is in fact we use MirrorView/S sync LUNS and we have LUN will concern because we cannot display the mirror and lun mirrored with the same uid when all the ESX servers are managed by a single CR.

Can RS we manage this for us?

I hope I'm clear with my problem

Thank you

Dominic.

First of all the current version of MRS. can't a single VC use case, so if the customer doesn't move on this one there then you cannout currently using SRM. It has many disadvantages in terms of DR to use a single VC, so reason why SRM architecture uses two.

When you have two SRM of the VC can work active / active and by that I mean you can have two production datacenters each replicating to the other, each acting as DR to another in the event of a site loss. SRM supports this configuration.

From my experience of VMotion between sites with more current VC25/ESX35 never really gives you a lot in terms of use cases since it is really an option for customers which is DC are close together and even in this case you end up with is a virtual machine running on a site that is accessing its virtual disks at the other site not that desirable. Another point here is what to do with this way of working, you should also have areas of SAN that accepts the LUNS are accessible on the sites and also potentially beyond safe limits.

Granted, I can see some obsucre use cases you want to to be able to vmotion VM on the site but nothing which makes it really interesting architecture this now, ok one day you might want to vmotion all around for the other site while you perform a hardware upgrade of hugh, but there are other ways this round with storage vmotion which give you even without interruption... Go ahead there is much more to come that will make vmotion over distance, a closer integration with the most interesting storage replication.

When you're right, now I think that the more important thing to establish is that it really your customer wants, is it simply a solution allowing them to run two production DC so they don't have standing kit slowed to a place? If yes then MRS can do for them now in a configuration active / active. I find lots of customes think they must cross the vmotion site without really thinking through and without thinking about the implications for things like vCenter design, such as:

The VC inventory / layout, be careful with the design, because everything is tense, to be very consistent and accurate with conventions of naming across all objects of inventroy will use the virtual machine

DRS/HA settings, ensure that you know which VM is important and set the correct settings by VM for recovery. Unless you have N + 1 reserve capacity on each site, you will need to set up the parameters HA/DRS that highlight the most important line of the first VM and not end up in a situation of failure with all your virtual computer online dev/test and half the production of 'Down' of the VM because you have not set the correct priorities in HA. In SRM, it is something that the descriptors of recovery plan and you can control.

Half brain, if you run the two sites as a big cluster HA/DRS ensure test you different failure scenarios, for example if the DRS (or manual VMotion) moving a bunch of VM is site1 to site2 but no failures that took place at that time there will now be left with contexts of CPU/memory/network of the virtual computer running on hosts to Site2, but accessing their VMDK on site1. This will work but is not always desirable from a perspective of latency (maybe no problem if enough bandwidth) However, what will happen if you suffer now Site1 disk failure, at this point the VM will not crash immediately Site2 and HA will take awhile to achieve those VMS have a problem. Try it and see, if you disconnect the storage for a virtual machine, the virtual machine will cling to life (assuming that IO is normal) for some time before a blue screen appears.

Presentation of storage, if your customer wants the area sites to actually be 'open' to all ESX hosts, then check that understand you the implications of the ESX LVM parameters with regards instant / will of the disc. You will potentially have ESX hosts that might at one point access to a source and target LUNs at the same time if someone or something to change LVM default settings. As we discussed earlier, with architectures of SRM this is handled by RS as the SRM architecture, you would not have this kind of open area.

Zoning by-law if the vsan / zones are truly open or guests as well then as certain events of fabric can be a potential pain. No event of thugs this RSCN disrupt both sites at the same time if all ESX hosts are on the same fabric open so be careful here. Not something that is too often but I have seen hurt some customers, usually comes down to bad HBA or cable can be a real pain to track down.

VC / limits ESX, you build out of campus cluster design ensures the design will you quickly to reach the limits of what she has supported this concerning things like the maximum number of machines virtual/VC, max number of LUNS/ESX host, max number host ESX/lun/paths etc.

Tags: VMware

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