vSAN re-design options?

Hi all - I have the following vSAN and environment need to input the direction in which you think I should go to achieve the best design

Current configuration:

3-node Dell R720 vSAN

Dedicated network 10Gig for VSANs

Each node has two groups of disks

First group of disks = 200 GB SSDS with SAS 10 K 4 x 1.2 TB disks

Second group of disks = 200 GB SSDS with SAS 10 K 3 x 1,2 TB disks

I would have liked to have had more large SSDS when buying, but the budget was not available.

I now have the option to buy another server to make a 4 node vSAN environment. Best for greater redundancy and my ultimate goal.

I hope to be able to pull in the budget for the largest drives in this server costs that I can reuse additional SSD to other servers.

Question 1:

If I have the new server with a higher spec big (400 GB) SSD drive and add it to the current cluster vSAN, vSAN will have problems with the gap between performance and size of disc between the nodes? I don't think so but asking anyway

Question 2:

If I am able to upgrade an SSD drive in each existing server will there be problems running a 2 disk group per server with different sizes (400 GB and a 200 GB) SSD - I don't think so but asking anyway

Question 3:

How would re-design of my new vSAN given that if I buy new disks SSD of 400 GB that I will still have available 200 GB SSDs for use somewhere should I change the number and size of my groups of disks per server for example? There are so many possibilities, I'd be interested to hear your opinions?

Thank you.

Question 1:

If I have the new server with a higher spec big (400 GB) SSD drive and add it to the current cluster vSAN, vSAN will have problems with the gap between performance and size of disc between the nodes? I don't think so but asking anyway.

It works perfectly.  However, Cormac and Duncan vSAN essential guide, it is recommended that all hosts are the same.

Question 2:

If I am able to upgrade an SSD drive in each existing server will there be problems running a 2 disk group per server with different sizes (400 GB and a 200 GB) SSD - I don't think so but asking anyway.

Same answer as above.

Question 3:

How would re-design of my new vSAN given that if I buy new disks SSD of 400 GB that I will still have available 200 GB SSDs for use somewhere should I change the number and size of my groups of disks per server for example? There are so many possibilities, I'd be interested to hear your opinions?

I think you pretty much designed it perfectly.  4 knots are the best because you have place to rebuild, if there is a failure.  You have dedicated 10 GB for vSAN.  All other components look too in the correct order.  And I don't think it's a big problem to mix and match the size of the SSD layer as long as they are equal performance of latency and/or throughput perspective.  And if you get to vSphere 6, you can use the plugin from health to make sure everything is functioning.  vSphere 6 offers also an add-in for Operations Manager vRealize for an additional view in how works the SSD layer.


What a load of work is on your vSAN?


Nice work!  Thank you, Zach.

Tags: VMware

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