I disagree. With co-located boxes and drop shipped drive replacements the time between a FAULT and the resilver event can be multiple days. Even though the re

I disagree. With co-located boxes and drop shipped drive replacements the time between a FAULT and the resilver event can be multiple days. Even though the resilver will go faster with a mirror having one disk remaining on a mirror vdev compared to raidz2 (or higher) mirrors will increase risk of data loss irrespective of resilver times because of drop ship drive replacement time. 3TB resilver on my last mechanical drive failure took 6 hours 30 minutes. Plus an additional 3 days for the drive to arrive. With mirror vdev setups you lose significantly more space as well. If you argue speed is worth it, then I would instead invest that money you saved going with a raidz2 with NVME cache and SLOG. Users won't notice the resilver event at all with a significant amount of memory and NVME cache + nvme SLOG tuned with a high /sys/module/zfs/parameters/zfs_dirty_data_max and larger than default /sys/module/zfs/parameters/zfs_txg_timeout.