Austin's SWE Notes 😭

    Super Disk

    A super disk is a concept created by discord which utilised both local SSD and cloud SSD for a high performance read and high persistent write.

    The architecture is as follow:

    Pasted image 20230903193558.png

    We have all the local SSD disk which stripe using RAID 0 and a persistent disk on cloud.

    The cloud persistent disk (on cloud for example EBS or EFS) will have RAID 1 which mirroring all the local disk data which lead to high persistent write.

    They rewrite the kernel so that it re-direct all READ to the local SSD disk (high performance read) and all write to the persistent disk on cloud (EBS or EFS) (high persistent write)

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