diff --git a/2025/xg-infra-upgrade-2025.md b/2025/xg-infra-upgrade-2025.md
index 5169a0f..0ab8f1b 100644
--- a/2025/xg-infra-upgrade-2025.md
+++ b/2025/xg-infra-upgrade-2025.md
@@ -97,6 +97,11 @@ root@mango:/data/test-dataset/dataset-1 # zfs list | grep dataset-1
 data/test-dataset/dataset-1   128M   410G   128M  /data/test-dataset/dataset-1
 ```
 
+# OpenZFS VM performance and database block size
+
+https://klarasystems.com/articles/openzfs-storage-best-practices-and-use-cases-part-3-databases-and-vms/
+https://github.com/openzfs/zfs/issues/7631 
+
 ## ZFS snapshot visibility
 
 Hide the `.zfs/snapshot` directory in the dataset so Syncthing doesn't sync it by accident when not ignored via `.stignore`: