VSAN migration

sword12
sword12 used Ask the Experts™
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Dear Vmware Experts


We have VSAN Hybrid cluster 18 nodes  with around 370 VMs  

Every server has 2 ports every port 10 G

Our core switches has 40 G   speed

Right now we have some performance issues most of the performance issues related to the Storage and network performance

So we are going to buy a new 6 servers and we are going to build all Flash VSAN cluster

The new servers will have 2 ports  10 G each  and 2 ports 40 G each

Both cluster new one and the old one will be managed under the Vcenter  (( we are using VMware distributed switch ))

After we build the new cluster we will start to migrate the most critical VMs from the old cluster to the new cluster one


And here my questions


1-      Using V motion changing host and data store between two clusters it will work without issues?
2-      When I V motion a VM like file server 40 TB can our user still use this file server or this not possible due to performance issues


My main concern for such plan the effect for availability and performance for the VMs which I want to V motion between the two cluster


Do you have any recommendations to achieve such target with fewer end users interruptions


Kindly advice
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AlexSenior Infrastructure Analyst

Commented:
1-      Using V motion changing host and data store between two clusters it will work without issues?

As long as it's configured correctly yes, your host server needs access to both datastores, That's the only requirement.

2-      When I V motion a VM like file server 40 TB can our user still use this file server or this not possible due to performance issues.

In theory it won't be an issue, from my understanding as long as the host server has access to both the source and destination datastores, it'll move the changed files as expected.

Realistically though, I'd configure this for an OOH migration just to be on the safe side, I doubt it's needed though.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
1. Yes.
2. Yes. to "When I V motion a VM like file server 40 TB can our user still use this file server "

Do you have any recommendations to achieve such target with fewer end users interruptions

there are no end user interruptions, otherwise the only other method is emergency downtime, and move with the VMs Powered OFF, which is then a migration with downtime, and not a vMotion.

Which will then affect service ?

But you first add....

Right now we have some performance issues most of the performance issues related to the Storage and network performance

So something is wrong with the current environment, and how do you know the new environment which you are migrating to, to get away from the issue, is going to fix it.

and if you have something WRONG with current environment, we cannot guarantee that your Storage vMotion's of VMs, is going to go well.

If you already have performance issues, storage vmotion may make the performance on the old cluster even worse, storage vMotions may fail, end user may experience more issues before you've even moved VMs to new cluster.

Have you been advised and had your vSAN design verified by VMware ? Most of the issues with vSAN is the hardware is no vSAN Ready Node approved.

I remember you implementing vSAN....

Author

Commented:
Hi Alex

As long as it's configured correctly yes, your host server needs access to both datastores, That's the only requirement.

here the question as i said it is two VSAN clsuters

two VSAN data store

so how can i give an access  the old Hybird VSAN cluster hosts to the new all FLASH VSAN cluster data store ?
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AlexSenior Infrastructure Analyst

Commented:
Good point, well presented.

Author

Commented:
as we all know the only wayes to let a vsphere host to see data store

1- directly attched storage
2- NFS
3- FC
4- ISCSI
5- VSAN data sstore

so here my issue how can i let the old VSAN cluster hosts be able to see the new VSAN data store

so i can start VMs Vmotins to change hosts and data stores

should i use iscsi ?

Author

Commented:
as i said before because we are using VMware distributed switch

so the hosts which member's in the old VSAN cluster  will be able to see the hosts in the new VSAN cluster

so all hosts connected on network level

now my question which i am thinking about how can i or which approach i have to take to let the old VSAN cluster hosts be able to access the new VSAN data store

if i found the right approach then i can  make vmotion to our production VMs


about performance issues (( it just because the old cluster over loaded )) so in worst case i can shutdown our test systems to reduce the load

but now i need an advice about my question

thnaks
VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
Build a NEW Environment, e.g. new VCSA, new Datacenter, new Cluster and do a

Cross vCenter Migration

https://kb.vmware.com/s/article/2106952

or add new servers to existing datacentre, and create a new cluster with new vSAN datastore, and then complete storage vMotions between Clusters.

OR

use a different tool, to perform workload migrations..

e.g.

HOW TO: Migrate physical, virtual and cloud based workloads with real-time replication to VMware vSphere (ESXi) using Double-Take MOVE

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