12/24/2023 0 Comments Openzfs snapshotA hundred datasets each with one hundred snapshots will see no performance impact on listing, while a single dataset with 2000 snapshots may take many seconds to return the list of snapshots. The performance impact is not related to the total number of snapshots on the system, but the snapshots on each dataset. Is it OK to have hundreds of snapshots? Assuming sufficient storage capacity, what about having thousands or tens of thousands of snapshots? In our experience, over 1000 snapshots per dataset starts to cause significant performance issues when listing, creating, replicating, and destroying snapshots. However, the performance of administrative operations, like listing and deleting snapshots, are impacted by the number of snapshots that exist in each dataset. But at what point will snapshots result in a performance hit? Unlike other filesystems, the existence of one or one thousand snapshots has no impact on the performance of the filesystem, reading and writing files performs the same either way. If you’re already using snapshots and aren’t an aggressive snapshot pruner, you’ve probably wondered: How many snapshots is too many? Since there’s no such thing as infinite storage capacity, your available disk space is an obvious limiting factor. If you haven’t used snapshots yet, give them a try! We’re confident you’ll quickly wonder how you ever got along without them. If you have been following this series, you may have already discovered how easy it is to create and manage OpenZFS snapshots. In this article, we’ll learn how ZFS boot environments (BEs) are used to boot the operating system itself into a previous point in time. In Basics of ZFS Snapshot Management, we demonstrated how snapshots and clones can be used to access data from a given point in time.
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