diff --git a/internal/hostmetrics/collector.go b/internal/hostmetrics/collector.go
index d0e4efa4b..2be3d7a9a 100644
--- a/internal/hostmetrics/collector.go
+++ b/internal/hostmetrics/collector.go
@@ -412,12 +412,13 @@ func collectDiskIO(ctx context.Context, diskExclude []string) []agentshost.DiskI
 		if isPartition(name) {
 			continue
 		}
-		// Skip loop devices and ram disks
-		if strings.HasPrefix(name, "loop") || strings.HasPrefix(name, "ram") {
-			continue
-		}
-		// Skip device-mapper and md devices (report at physical level)
-		if strings.HasPrefix(name, "dm-") {
+		// Skip virtual/pseudo block devices (loop, ram, dm-, md, zvols,
+		// zram, nbd, rbd, drbd, ...). ZFS-backed Proxmox hosts expose one
+		// zd<N> device per zvol, so without this a host with a few hundred
+		// guests reports a few hundred phantom disks on every collection
+		// cycle (issue #1671). The prefix list is shared with SMART
+		// collection and the server-side resource registry.
+		if fsfilters.IsVirtualBlockDevice(name) {
 			continue
 		}
 		// Skip user-excluded devices (issue #1142)
diff --git a/internal/hostmetrics/coverage_additional_test.go b/internal/hostmetrics/coverage_additional_test.go
index ca2632f4f..9b318e2f0 100644
--- a/internal/hostmetrics/coverage_additional_test.go
+++ b/internal/hostmetrics/coverage_additional_test.go
@@ -189,20 +189,30 @@ func TestCollectDiskIOFiltersAndError(t *testing.T) {
 			"ram0":      {ReadBytes: 7},
 			"dm-0":      {ReadBytes: 8},
 			"sdb":       {ReadBytes: 9},
-			"md0":       {ReadBytes: 10},
+			// Aggregate virtual devices whose counters restate the I/O of
+			// the physical members underneath them.
+			"md0": {ReadBytes: 10},
+			// ZFS zvols. A Proxmox host with ZFS-backed guest storage
+			// exposes one of these per zvol (issue #1671).
+			"zd0":   {ReadBytes: 11},
+			"zd16":  {ReadBytes: 12},
+			"zd160": {ReadBytes: 13},
+			"zram0": {ReadBytes: 14},
+			"nbd0":  {ReadBytes: 15},
+			"rbd0":  {ReadBytes: 16},
 		}, nil
 	}
 
 	disks := collectDiskIO(context.Background(), []string{"sdb"})
-	if len(disks) != 3 {
-		t.Fatalf("expected 3 disk I/O entries after filtering, got %d: %+v", len(disks), disks)
+	if len(disks) != 2 {
+		t.Fatalf("expected 2 disk I/O entries after filtering, got %d: %+v", len(disks), disks)
 	}
 
 	gotDevices := make([]string, 0, len(disks))
 	for _, disk := range disks {
 		gotDevices = append(gotDevices, disk.Device)
 	}
-	wantDevices := []string{"md0", "nvme0n1", "sda"}
+	wantDevices := []string{"nvme0n1", "sda"}
 	if !reflect.DeepEqual(gotDevices, wantDevices) {
 		t.Fatalf("unexpected disk I/O devices: got %v, want %v", gotDevices, wantDevices)
 	}