jerry5
Enthusiast
Enthusiast
‎11-08-2021 12:50 PM

cache/capacity disks need to be in same ESXI-host?

I am new to vSan concept and practice.

I got a question on vSan concept:

  • Currently, I assign one disk as cache-disk in one ESXI host.
  •                 I assign one disk as capacity-disk in another ESXI host.
  • And I can not proceed as there are "Claiming issues" 
  • do cache/capacity disks need to be in the same ESXI host? 

Thanks!   

(For reference, I attached two screenshots)

cache-capacity.jpg

warn-error.jpg

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CyberNils
Hot Shot
Hot Shot
‎11-09-2021 12:28 AM

Yes, you need at least one cache disk and one capacity disk per host.



Nils Kristiansen
https://cybernils.net/
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TheBobkin
Champion
Champion
‎11-09-2021 12:28 AM

@jerry5 Yes - Disk-Groups are comprised of 1 Cache-tier SSD/NVMe and 1-7 Capacity-tier HDD/SSD/NVMe on each node, these are local-only (e.g. physically in a single ESXi host).

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TheBobkin
Champion
Champion
‎11-09-2021 12:46 AM

@CyberNils , Actually it is not mandatory for a vSAN node to have Disk-Groups - you can have compute-only nodes. If you meant you need minimum 1 Cache-tier device + Capacity-tier device per node to make a Disk-Group, that would be true.

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jerry5
Enthusiast
Enthusiast
‎11-09-2021 08:19 AM

Thank Nils, Bobkin: you guys save my time and energy!

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CyberNils
Hot Shot
Hot Shot
‎11-10-2021 12:01 AM

I know, but it was pretty obvious that this guy was not trying to add a compute only node to an existing cluster... :slightly_smiling_face:



Nils Kristiansen
https://cybernils.net/
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