#VDEV EVICTION OPENZFS HOW TO#

ZFS redundancy is at the vdev level, not the zpool level. Zpools cannot share vdevs with one another. Zpools are self-contained units-one physical computer may have two or more separate zpools on it, but each is entirely independent of any others.

A zpool contains one or more vdevs, each of which in turn contains one or more devices. The zpool is the uppermost ZFS structure. The first set of major building blocks to understand are zpools, vdevs, and devices. ZFS merges the traditional volume management and filesystem layers, and it uses a copy-on-write transactional mechanism-both of these mean the system is very structurally different than conventional filesystems and RAID arrays. To really understand ZFS, you need to pay real attention to its actual structure. Just know up front that in the understated words of OpenZFS developer Matt Ahrens, 'it's really complicated.'īut before we get to the numbers-and they are coming, I promise!-for all the ways you can shape eight disks' worth of ZFS, we need to talk about how ZFS stores your data on-disk in the first place. Well, today is the day to explore, ZFS-curious readers. In the second of those stories, we even promised a follow-up exploring the performance of various multiple-disk topologies in ZFS, the next-gen filesystem you have heard about because of its appearances everywhere from Apple to Ubuntu.

#VDEV EVICTION OPENZFS HOW TO#

Understanding RAID: How performance scales from one disk to eightĪs we all enter month three of the COVID-19 pandemic and look for new projects to keep us engaged ( read: sane), can we interest you in learning the fundamentals of computer storage? Quietly this spring, we've already gone over some necessary basics like how to test the speed of your disks and what the heck RAID is.ZFS 101-Understanding ZFS storage and performance.ZFS versus RAID: Eight Ironwolf disks, two filesystems, one winner.Return to RAID: The Ars readers “What If?” edition.OpenZFS 2.1 is out-let’s talk about its brand-new dRAID vdevs.

Vdev eviction openzfs