extremely slow disk I/O after updating to 12.0

Robert Schulze rs at bytecamp.net
Wed Jul 3 11:44:03 UTC 2019


Am 03.07.19 um 13:34 schrieb David Demelier:
> Hello folks,
> I've upgraded one of my servers to 12.0-RELEASE. Now I'm having
> extremely slow performances regarding I/O writes.

we have seen a drop in I/O performance beginning with 11.2-RELEASE.
Try disabling scattered ABD:

sysctl vfs.zfs.abd_scatter_enabled=0

Robert Schulze

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