Resource pool reservation/expandable reservation

EssendonEssendon Member Posts: 4,546 ■■■■■■■■■■
I have 24GB of RAM available at the cluster level (there are 3 hosts). I created two resource pools and called them Development_VMs and Production VM's. See screenshot for settings.



Note how Expandable Reservation is enabled. I understand that this is to satisfy virtual machine-level reservation set within the resource pool. Questions:

1. How is the used reservation = 576MB? I added up the virtual machine overhead memory and it comes to 300MB, there is no reservation set at the VM level so how is it 576MB? Is it some other kind of overhead?

2. I realize I have Expandable Reservation enabled, how did it calculate that the available reservation is 9341 MB? I have 24GB RAM at the cluster level and the other pool (Development_VMs) has the following config:



So I guess the question is how it arrived at 9341 MB? Configured RAM on each VM is (AppVM2 = 256MB, Dummy = 4GB, VM1 = 256MB and VM2 = 4GB)

Thanks!
NSX, NSX, more NSX..

Blog >> http://virtual10.com

Comments

  • dave330idave330i Member Posts: 2,091 ■■■■■■■■■■
    Essendon wrote: »
    I have 24GB of RAM available at the cluster level (there are 3 hosts). I created two resource pools and called them Development_VMs and Production VM's. See screenshot for settings.



    Note how Expandable Reservation is enabled. I understand that this is to satisfy virtual machine-level reservation set within the resource pool. Questions:

    1. How is the used reservation = 576MB? I added up the virtual machine overhead memory and it comes to 300MB, there is no reservation set at the VM level so how is it 576MB? Is it some other kind of overhead?

    2. I realize I have Expandable Reservation enabled, how did it calculate that the available reservation is 9341 MB? I have 24GB RAM at the cluster level and the other pool (Development_VMs) has the following config:



    So I guess the question is how it arrived at 9341 MB? Configured RAM on each VM is (AppVM2 = 256MB, Dummy = 4GB, VM1 = 256MB and VM2 = 4GB)

    Thanks!

    Expandable reservation allows the resource pool to borrow resource from the parent cluster/resource pool. As for the 576 MB resource used, did you add the CPU & memory overhead?
    2018 Certification Goals: Maybe VMware Sales Cert
    "Simplify, then add lightness" -Colin Chapman
  • EssendonEssendon Member Posts: 4,546 ■■■■■■■■■■
    I know it borrows from its ancestor, but how did it arrive at that figure?

    That might be it but how do I find out the CPU overhead?
    NSX, NSX, more NSX..

    Blog >> http://virtual10.com
  • dave330idave330i Member Posts: 2,091 ■■■■■■■■■■
    My bad. For some reason I thought vCenter reported CPU & RAM overhead seperately.
    2018 Certification Goals: Maybe VMware Sales Cert
    "Simplify, then add lightness" -Colin Chapman
  • EssendonEssendon Member Posts: 4,546 ■■■■■■■■■■
    Bumping this up guys.
    NSX, NSX, more NSX..

    Blog >> http://virtual10.com
  • jibbajabbajibbajabba Member Posts: 4,317 ■■■■■■■■□□
    Check the overhead reservation

    VM > Resource Allocation > Overhead Reservation
    My own knowledge base made public: http://open902.com :p
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