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seamon

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  1. seamon's post in ZFS SLOG + L2ARC on one device was marked as the answer   
    Okay I figured out a dirty way to do this.

    Follow this guide to partition your Optane Drive into 2 Partition (I did 10GB for SLOG and 100GB for L2ARC).

    SLOG is /dev/nvme0n1p1 and L2ARC is /dev/nvme0n1p2

    You can't start the array with SLOG and L2ARC enabled, they have to be added after array is started so I created a User Script that runs at Array Startup.

    zfs set compression=lz4 cache #zfs compression gets sets to on instead of lz4, this step is optional
    zpool add cache log /dev/nvme0n1p1
    zpool add cache cache /dev/nvme0n1p2

    At Array Shutdown, the vdevs have to be removed.

    zpool import cache #if unraid was improperly shutdown, this script will instead import the zpool, remove and support vdevs and then you have to restart unraid again to make this work.
    zpool remove cache /dev/nvme0n1p1
    zpool remove cache /dev/nvme0n1p2


    Any help in refining this further would be appreciated.

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