Bsd Now

Why ZFS is doing filesystem checksumming right, better TMPFS throughput performance on DragonFlyBSD, reshaping pools with ZFS, PKGSRC on Manjaro aarch64 Pinebook-pro, central log host with syslog-ng on FreeBSD, and more. Headlines Checksumming in filesystems, and why ZFS is doing it right (https://oshogbo.vexillium.org/blog/73/) One of the best aspects of ZFS is its reliability. This can be accomplished using a few features like copy-on-write approach and checksumming. Today we will look at how ZFS does checksumming and why it does it the proper way. Most of the file systems don’t provide any integrity checking and fail in several scenarios: Data bit flips - when the data that we wanted to store are bit flipped by the hard drives, or cables, and the wrong data is stored on the hard drive. Misdirected writes - when the CPU/cable/hard drive will bit flip a block to which the data should be written. Misdirected read - when we miss reading the block when a bit flip occurred. Phantom writes - when the write operat