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ZFS dataset IO statistics

[python] [zfs]

ioztat is to OpenZFS datasets what zpool-iostat(8) is to ZFS pools and vdevs.

Where zpool-iostat provides IO statistics for accesses to the lower level components that make up a ZFS filesystem — the devices that underpin it and the mirrored, striped, and parity-combined virtual devices these are part of — ioztat does so for the filesystems and virtual block devices layered on top.

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