It is a common misconception that ZFS "stripes" writes across the pool-but this is inaccurate. Modern zpools can survive the loss of a CACHE or LOG vdev-though they may lose a small amount of dirty data, if they lose a LOG vdev during a power outage or system crash. 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.
#OPENZFS LZ4 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.
Jim Salter reader comments 259 with Storage fundamentals
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