We created a single dRAID vdev with 2 parity devices, 4 data devices, and 1 spare device per stripe-in condensed jargon, a draid2:4:1.Įven though we have 11 total disks in the draid2:4:1, only six are used in each data stripe-and one in each physical stripe. In the above example, we have 11 disks: wwn-0 through wwn-A. We can see this in action in the following example, lifted from the dRAID Basic Concepts documentation: zpool create mypool draid2:4d:1s:11c wwn-0 wwn-1 wwn-2. These numbers are independent of the number of actual disks in the vdev. When creating a dRAID vdev, the admin specifies a number of data, parity, and hotspare sectors per stripe. Distributed RAID (dRAID) is an entirely new vdev topology we first encountered in a presentation at the 2016 OpenZFS Dev Summit. Distributed RAID (dRAID) overviewįurther Reading ZFS 101-Understanding ZFS storage and performanceIf you already thought ZFS topology was a complex topic, get ready to have your mind blown. Since then, it's been heavily tested in several major OpenZFS development shops-meaning today's release is "new" to production status, not "new" as in untested. dRAID has been under active development since at least 2015 and reached beta status when merged into OpenZFS master in November 2020. Today, we're going to focus on arguably the biggest feature OpenZFS 2.1.0 adds-the dRAID vdev topology. This release offers several general performance improvements, as well as a few entirely new features-mostly targeting enterprise and other extremely advanced use cases. The new release is compatible with FreeBSD 12.2-RELEASE and up and Linux kernels 3.10-5.13. Understanding RAID: How performance scales from one disk to eightįriday afternoon, the OpenZFS project released version 2.1.0 of our perennial favorite "it's complicated but worth it" filesystem.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.
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