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6 metrics for zpool performance, 2FA with ssh on OpenBSD, ZFS maintaining file type information in dirs, everything old is new again, netcat demystified, and more. ##Headlines Six Metrics for Measuring ZFS Pool Performance Part 1 The layout of a ZFS storage pool has a significant impact on system performance under various workloads. Given the importance of picking the right configuration for your workload and the fact that making changes to an in-use ZFS pool is far from trivial, it is important for an administrator to understand the mechanics of pool performance when designing a storage system. To quantify pool performance, we will consider six primary metrics: Read I/O operations per second (IOPS) Write IOPS Streaming read speed Streaming write speed Storage space efficiency (usable capacity after parity versus total raw capacity) Fault tolerance (maximum number of drives that can fail before data loss) For the sake of comparison, we’ll use an example system with 12 drives, each one sized at 6TB, and say