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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
mkstage4 has always been my goto on Gentoo. Boot from live media, create your partitions, mount, extract the tarball to the destination and chroot into the new installation for cleanup... emerge -avuDn @world for good measure.
If you have another system but it can only fit one storage device, put the new one in there, use NBD (or ATAoE, or iSCSI) to expose that storage device over the network to the old system, and use the regular ZFS tools to migrate data. This is how I typically clone systems in the scenario you’re describing (albeit usually using other tooling as I typically do not use ZFS), and if you’ve got a reliable network it generally works very well.
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