adding zfs-fast-copying post

homepage/content/blog/zfs-fast-copying/index.md

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+---
+title: 'ZFS Fast File Copy'
+date: 2024-05-11T19:45:09+02:00
+draft: false
+description: How you can copy files between different ZFS datasets at lightning fast speeds
+authors: ["DerLev"]
+tags: ["zfs"]
+---
+
+Just a quick thing that I recently discovered:  
+ZFS can copy/move files between datasets very fast.
+
+To do this you will need at least `ZFS 2.2` on your pool. To check that you can run the first command. If that command returns a dash for the pool version use the second command, your pool uses feature flags instead of version numbers. If the feature filtered by grep returns `enabled` you are good to go.
+
+{{< file "bash" "/bin/bash" >}}
+
+```bash
+zpool get version PoolName
+
+# if above returns '-' use this
+zpool get all PoolName | grep feature@block_cloning
+```
+
+To copy or move a file you will just need to use `--reflink=auto` with the copy command. Sadly this does not work with the `mv` command so you will need to delete the original file if you want to move it.
+
+{{< file "bash" "/bin/bash" >}}
+
+```bash
+cp --reflink=auto /mnt/zpool/from/path /mnt/zpool/to/path
+```
+
+This operation should be really fast because ZFS just needs to edit its journal (ZIL/SLOG) to reference the same blocks for the file in the new dataset.
+
+That's it for this short article. As I wrote in the about page, this is what most of the articles will look like. Just short notes for special commands or other things.
+
+```box { type=tip }
+Further reading & sources:  
+https://github.com/openzfs/zfs/discussions/15447  
+https://github.com/openzfs/zfs/issues/405  
+https://github.com/openzfs/zfs/pull/13392
+```

homepage/content/tags/zfs/_index.md

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+---
+title: 'zfs'
+description: OpenZFS is the Open Source implementation of Sun's ZFS file system and volume manager
+---