diff --git a/nexus/db-queries/src/db/datastore/physical_disk.rs b/nexus/db-queries/src/db/datastore/physical_disk.rs
index 0e1fd56881..f8d0282117 100644
--- a/nexus/db-queries/src/db/datastore/physical_disk.rs
+++ b/nexus/db-queries/src/db/datastore/physical_disk.rs
@@ -242,12 +242,10 @@ mod test {
     }
 
     // Only checking some fields:
-    // - The UUID of the disk may actually not be the same as the upserted one;
-    // the "vendor/serial/model" value is the more critical unique identifier.
-    // NOTE: Could we derive a UUID from the VSM values?
     // - The 'time' field precision can be modified slightly when inserted into
     // the DB.
-    fn assert_disks_equal_ignore_uuid(lhs: &PhysicalDisk, rhs: &PhysicalDisk) {
+    fn assert_disks_equal_ignore_time(lhs: &PhysicalDisk, rhs: &PhysicalDisk) {
+        assert_eq!(lhs.uuid(), rhs.uuid());
         assert_eq!(lhs.time_deleted().is_some(), rhs.time_deleted().is_some());
         assert_eq!(lhs.vendor, rhs.vendor);
         assert_eq!(lhs.serial, rhs.serial);
@@ -257,9 +255,9 @@ mod test {
     }
 
     #[tokio::test]
-    async fn physical_disk_upsert_different_uuid_idempotent() {
+    async fn physical_disk_upsert_uuid_generation_deterministic() {
         let logctx = dev::test_setup_log(
-            "physical_disk_upsert_different_uuid_idempotent",
+            "physical_disk_upsert_uuid_generation_deterministic",
         );
         let mut db = test_setup_database(&logctx.log).await;
         let (opctx, datastore) = datastore_test(&logctx, &db).await;
@@ -280,7 +278,7 @@ mod test {
             .await
             .expect("Failed first attempt at upserting disk");
         assert_eq!(disk.uuid(), first_observed_disk.uuid());
-        assert_disks_equal_ignore_uuid(&disk, &first_observed_disk);
+        assert_disks_equal_ignore_time(&disk, &first_observed_disk);
 
         // Observe the inserted disk
         let pagparams = list_disk_params();
@@ -290,9 +288,12 @@ mod test {
             .expect("Failed to list physical disks");
         assert_eq!(disks.len(), 1);
         assert_eq!(disk.uuid(), disks[0].uuid());
-        assert_disks_equal_ignore_uuid(&disk, &disks[0]);
+        assert_disks_equal_ignore_time(&disk, &disks[0]);
 
-        // Insert the same disk, with a different UUID primary key
+        // Insert the same disk, but don't re-state the UUID.
+        //
+        // The rest of this test relies on the UUID derivation being
+        // deterministic.
         let disk_again = PhysicalDisk::new(
             String::from("Oxide"),
             String::from("123"),
@@ -300,15 +301,14 @@ mod test {
             PhysicalDiskKind::U2,
             sled_id,
         );
+        // With the same input parameters, the UUID should be deterministic.
+        assert_eq!(disk.uuid(), disk_again.uuid());
+
         let second_observed_disk = datastore
             .physical_disk_upsert(&opctx, disk_again.clone())
             .await
             .expect("Failed second upsert of physical disk");
-        // This check is pretty important - note that we return the original
-        // UUID, not the new one.
-        assert_ne!(disk_again.uuid(), second_observed_disk.uuid());
-        assert_eq!(disk_again.id(), second_observed_disk.id());
-        assert_disks_equal_ignore_uuid(&disk_again, &second_observed_disk);
+        assert_disks_equal_ignore_time(&disk_again, &second_observed_disk);
         assert!(
             first_observed_disk.time_modified()
                 <= second_observed_disk.time_modified()
@@ -318,13 +318,9 @@ mod test {
             .sled_list_physical_disks(&opctx, sled_id, &pagparams)
             .await
             .expect("Failed to re-list physical disks");
-
-        // We'll use the old primary key
         assert_eq!(disks.len(), 1);
-        assert_eq!(disk.uuid(), disks[0].uuid());
-        assert_ne!(disk_again.uuid(), disks[0].uuid());
-        assert_disks_equal_ignore_uuid(&disk, &disks[0]);
-        assert_disks_equal_ignore_uuid(&disk_again, &disks[0]);
+        assert_disks_equal_ignore_time(&disk, &disks[0]);
+        assert_disks_equal_ignore_time(&disk_again, &disks[0]);
 
         db.cleanup().await.unwrap();
         logctx.cleanup_successful();
@@ -364,7 +360,7 @@ mod test {
             first_observed_disk.time_modified()
                 <= second_observed_disk.time_modified()
         );
-        assert_disks_equal_ignore_uuid(
+        assert_disks_equal_ignore_time(
             &first_observed_disk,
             &second_observed_disk,
         );
diff --git a/nexus/preprocessed_configs/config.xml b/nexus/preprocessed_configs/config.xml
new file mode 100644
index 0000000000..9b13f12aea
--- /dev/null
+++ b/nexus/preprocessed_configs/config.xml
@@ -0,0 +1,41 @@
+<!-- This file was generated automatically.
+     Do not edit it: it is likely to be discarded and generated again before it's read next time.
+     Files used to generate this file:
+       config.xml      -->
+
+<!-- Config that is used when server is run without config file. --><clickhouse>
+    <logger>
+        <level>trace</level>
+        <console>true</console>
+    </logger>
+
+    <http_port>8123</http_port>
+    <tcp_port>9000</tcp_port>
+    <mysql_port>9004</mysql_port>
+
+    <path>./</path>
+
+    <mlock_executable>true</mlock_executable>
+
+    <users>
+        <default>
+            <password/>
+
+            <networks>
+                <ip>::/0</ip>
+            </networks>
+
+            <profile>default</profile>
+            <quota>default</quota>
+            <access_management>1</access_management>
+        </default>
+    </users>
+
+    <profiles>
+        <default/>
+    </profiles>
+
+    <quotas>
+        <default/>
+    </quotas>
+</clickhouse>
\ No newline at end of file