ZFS vs Directory - performance issues

jcbhltz22

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Mar 8, 2021
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I am running some tests after noticing some performance issues with guest disks. My guest has two disks, each is raw 4TB with default settings. One disk is using the ZFS storage, the other is using "directory" (which is using the ZFS disks root directory)

The storage is used for large media files, so mostly concerned with sequential write speeds.

ZFS:
WRITE: bw=105MiB/s (110MB/s), 105MiB/s-105MiB/s (110MB/s-110MB/s), io=50.0GiB (53.7GB), run=487705-487705msec

Directory (ZFS)
WRITE: bw=699MiB/s (733MB/s), 699MiB/s-699MiB/s (733MB/s-733MB/s), io=50.0GiB (53.7GB), run=73260-73260msec



Im wondering why the large difference in performance here?