S2D Hybrid Storage Pool Cache only using 2 NVME Drives

Cajun 1 Reputation point
2020-08-04T21:07:26.543+00:00

I have a recently created 5 node Server 2019 S2D cluster that has the following config on each server.

2x 1.6TB NVMe
2x 1.6TB SSD
4x 8TB HDD

I ran the Enable-ClusterS2D and have working loads on the cluster. I have notice that only 2 of the NVMe drives are used as cache/journal, the remainder are listed as capacity but I didn't think that was a supported/suggested scenario.

I have noticed some odd latency issues at high utilization which may or may not be related to this.

Anyone else experienced this? Is this normal? What am I missing?

15613-image.png

EDIT: OS is Server 2019

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Windows Server Clustering
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  1. Xiaowei He 9,871 Reputation points
    2020-08-05T09:04:01.973+00:00

    Hi,

    As far as I know, S2D will be set automatically when we enable S2D. We can calculator the S2D capacity via the following link:

    https://s2dcalc.blob.core.windows.net/www/index.html

    According to your information, it results in 35.2 TB of physical capacity and 3.2 TB of cache per node.

    68.9TB usable, 75.1TB resiliency, and 32TB reserve. Please check if it is the same as your lab.

    15738-image.png

    If the reply could be of help, please help to accept it as an answer, thanks for your cooperation!
    Thanks for your time!
    Best Regards,
    Anne

  2. Pascal Slijkerman 91 Reputation points
    2020-09-30T13:50:20.907+00:00

    Do you see the same output if you run Get-PhysicalDisk on one of the cluster nodes?
    I have seen one cluster before were the cache devices were added as capacity

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