Comment by StavrosK

6 years ago

Same here (4-drive raidz for many years), though I do have an issue where deleting large files (~1 GB) takes around a minute and nobody seems to know why (I have plenty free space and RAM)...

6 comments

StavrosK

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dekhn  6 years ago

do you have lots of snapshots? every snapshotting FS I've worked with has really slow deletes, especially when the volume is near capacity.

  • rleigh  6 years ago

    Snapshots are one thing ZFS is fast at. All the blocks for a given snapshot are placed on a "deadlist". Snapshot deletion is essentially just returning this list of blocks back to the free pool. A terabyte snapshot will take a short while (in the background) to recycle those blocks. But the deletion itself is near instantaneous.

    • dekhn  6 years ago

      I think you misunderstand: file deletions are what is slow (I don't use ZFS, my reference is WAFL, but my understanding is that all snapshotting file systems have this problem).

      2 replies →

  • StavrosK  6 years ago

    I have 400 in total, though none on the slow volume :/ That shouldn't affect it, right?