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=== Ztop Links: + link:https://github.com/asomers/ztop[Repository] + link:https://www.freshports.org/sysutils/ztop[Port] + Contact: Alan Somers <[email protected]> + `ztop` is a new utility that displays ZFS datasets' I/O in real time, like `top`, but for ZFS. Unlike the existing `zpool iostat`, which only displays traffic at the level of a pool, `ztop` displays it at the level of individual datasets. Previously, there was no tool that could display this information. The link:https://github.com/prometheus/node_exporter/pull/1632[Prometheus Node Exporter] can export it into Prometheus, from which it can be viewed after the fact with various other tools, but that requires a large stack of software, and isn't real-time. I started `ztop` this quarter, and it is now fully functional. However, it has revealed a performance problem within the kernel. In the presence of more than a few thousand datasets, the sysctl interface is too slow and `ztop` becomes sluggish. Future work, if I have the time, will address that problem. Sponsor: Axcient