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VSAN Basics – Changing a VM’s storage policy

Duncan Epping · Mar 22, 2014 ·

I have been talking a lot about the architecture of VSAN and have written many articles. It seems that somehow some of the more basic topics have not been fully addressed yet like changing a VM’s storage policy. One of our field folks had a question from a customer which was based on this video.

The question was how do you change the policy of a single VM? And why would you change the policy for a group of VMs?

Lets answer the “group of VMs” question first. You can imagine setting a policy for VMs that perform a specific function, for instance web servers. It could be that after a period of monitoring you notice that these VMs are not performing as expected when data needs to come from spindles. By changing the policy, as demonstrated in the video, you can simply increase the stripe width for all virtual machines.

Now the question remains, how do I change the policy of a single VM? It is actually really straight forward:

  • Create a new policy
    • Go to VM Storage Policies
    • Click “Create a new storage policy”
    • Select the capabilities
  • Now go to your virtual machines and right click VM which needs a new policy
  • Click on “all vCenter actions”
  • Click on “VM Storage Policies”
  • Click on “Manage…”
  • Select a new policy
  • Apply to disks
  • Click “Ok”

Now the new policy will be applied to the VM. Depending on the selected policy this will take a certain amount of time as new components of your objects may need to be created.

 

Related

Server, Software Defined, Storage, vSAN 5.5, basics, u1, virtual san, vsan

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Comments

  1. Benjamin Bohec says

    25 March, 2014 at 16:15

    Hello Duncan,

    Thanks for all these VSAN information. It’s very helpful.

    I didn’t find information about VSAN configuration capabilities for VMware Stretch/Metro Clusters accross two datacenters (< 10km) with VSAN VLAN distribution.
    Is it possible to specify on a VSAN rule set that replicas must be on different "Server Groups" (DRS Host Groups/Labels/…) in order to avoid rack/room/campus/site failure?

    Thanks.

    • Duncan Epping says

      25 March, 2014 at 19:06

      Did you look here? http://www.yellow-bricks.com/virtual-san/

      • Benjamin Bohec says

        25 March, 2014 at 19:41

        Thanks Duncan, I have my answer.

        http://www.yellow-bricks.com/2013/10/31/vsphere-metro-storage-cluster-using-virtual-san-can/

        I hope there will be a roadmap for this feature soon.

        Regards,

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About the author

Duncan Epping is a Chief Technologist in the Office of CTO of the Cloud Platform BU at VMware. He is a VCDX (# 007), the author of the "vSAN Deep Dive", the “vSphere Clustering Technical Deep Dive” series, and the host of the "Unexplored Territory" podcast.

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