diff --git a/app/import/main.go b/app/import/main.go
index 71a99341..f49e16ba 100644
--- a/app/import/main.go
+++ b/app/import/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"os"
 
@@ -35,7 +36,7 @@ func main() {
 	}
 }
 
-func doImport(logger log.Logger, fs fs.Filesystem, configstore cfgstore.Store) error {
+func doImport(logger log.Logger, filesystem fs.Filesystem, configstore cfgstore.Store) error {
 	if logger == nil {
 		logger = log.New("")
 	}
@@ -74,8 +75,8 @@ func doImport(logger log.Logger, fs fs.Filesystem, configstore cfgstore.Store) e
 
 	logger = logger.WithField("database", v1filename)
 
-	if _, err := fs.Stat(v1filename); err != nil {
-		if os.IsNotExist(err) {
+	if _, err := filesystem.Stat(v1filename); err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
 			logger.Info().Log("Database doesn't exist and nothing will be imported")
 			return nil
 		}
@@ -88,7 +89,7 @@ func doImport(logger log.Logger, fs fs.Filesystem, configstore cfgstore.Store) e
 
 	// Load an existing DB
 	datastore, err := jsonstore.New(jsonstore.Config{
-		Filesystem: fs,
+		Filesystem: filesystem,
 		Filepath:   cfg.DB.Dir + "/db.json",
 	})
 	if err != nil {
@@ -116,7 +117,7 @@ func doImport(logger log.Logger, fs fs.Filesystem, configstore cfgstore.Store) e
 	importConfig.binary = cfg.FFmpeg.Binary
 
 	// Rewrite the old database to the new database
-	r, err := importV1(fs, v1filename, importConfig)
+	r, err := importV1(filesystem, v1filename, importConfig)
 	if err != nil {
 		logger.Error().WithError(err).Log("Importing database failed")
 		return fmt.Errorf("importing database failed: %w", err)
diff --git a/cluster/leader.go b/cluster/leader.go
index 035cdce7..bbde80b2 100644
--- a/cluster/leader.go
+++ b/cluster/leader.go
@@ -853,9 +853,9 @@ func synchronize(wish map[string]string, want []store.Process, have []proxy.Proc
 	// A map from the process ID to the process config of the processes
 	// we want to be running on the nodes.
 	wantMap := map[string]store.Process{}
-	for _, process := range want {
-		pid := process.Config.ProcessID().String()
-		wantMap[pid] = process
+	for _, wantP := range want {
+		pid := wantP.Config.ProcessID().String()
+		wantMap[pid] = wantP
 	}
 
 	opStack := []interface{}{}
@@ -1007,16 +1007,29 @@ func synchronize(wish map[string]string, want []store.Process, have []proxy.Proc
 	}
 
 	// The wantMap now contains only those processes that need to be installed on a node.
+	// We will rebuild the "want" array from the wantMap in the same order as the original
+	// "want" array to make the resulting opStack deterministic.
+	wantReduced := []store.Process{}
+	for _, wantP := range want {
+		pid := wantP.Config.ProcessID().String()
+		if _, ok := wantMap[pid]; !ok {
+			continue
+		}
+
+		wantReduced = append(wantReduced, wantP)
+	}
 
 	// Create a map from the process reference to the node it is running on.
 	haveReferenceAffinityMap := createReferenceAffinityMap(have)
 
 	// Now, all remaining processes in the wantMap must be added to one of the nodes.
-	for pid, process := range wantMap {
+	for _, wantP := range wantReduced {
+		pid := wantP.Config.ProcessID().String()
+
 		// If a process doesn't have any limits defined, reject that process
-		if process.Config.LimitCPU <= 0 || process.Config.LimitMemory <= 0 {
+		if wantP.Config.LimitCPU <= 0 || wantP.Config.LimitMemory <= 0 {
 			opStack = append(opStack, processOpReject{
-				processid: process.Config.ProcessID(),
+				processid: wantP.Config.ProcessID(),
 				err:       errNoLimitsDefined,
 			})
 
@@ -1029,9 +1042,9 @@ func synchronize(wish map[string]string, want []store.Process, have []proxy.Proc
 		nodeid := ""
 
 		// Try to add the process to a node where other processes with the same reference currently reside.
-		if len(process.Config.Reference) != 0 {
-			for _, count := range haveReferenceAffinityMap[process.Config.Reference+"@"+process.Config.Domain] {
-				if hasNodeEnoughResources(resources[count.nodeid], process.Config.LimitCPU, process.Config.LimitMemory) {
+		if len(wantP.Config.Reference) != 0 {
+			for _, count := range haveReferenceAffinityMap[wantP.Config.Reference+"@"+wantP.Config.Domain] {
+				if hasNodeEnoughResources(resources[count.nodeid], wantP.Config.LimitCPU, wantP.Config.LimitMemory) {
 					nodeid = count.nodeid
 					break
 				}
@@ -1040,29 +1053,29 @@ func synchronize(wish map[string]string, want []store.Process, have []proxy.Proc
 
 		// Find the node with the most resources available
 		if len(nodeid) == 0 {
-			nodeid = findBestNodeForProcess(resources, process.Config.LimitCPU, process.Config.LimitMemory)
+			nodeid = findBestNodeForProcess(resources, wantP.Config.LimitCPU, wantP.Config.LimitMemory)
 		}
 
 		if len(nodeid) != 0 {
 			opStack = append(opStack, processOpAdd{
 				nodeid:   nodeid,
-				config:   process.Config,
-				metadata: process.Metadata,
-				order:    process.Order,
+				config:   wantP.Config,
+				metadata: wantP.Metadata,
+				order:    wantP.Order,
 			})
 
 			// Consume the resources
 			r, ok := resources[nodeid]
 			if ok {
-				r.CPU += process.Config.LimitCPU
-				r.Mem += process.Config.LimitMemory
+				r.CPU += wantP.Config.LimitCPU
+				r.Mem += wantP.Config.LimitMemory
 				resources[nodeid] = r
 			}
 
 			reality[pid] = nodeid
 		} else {
 			opStack = append(opStack, processOpReject{
-				processid: process.Config.ProcessID(),
+				processid: wantP.Config.ProcessID(),
 				err:       errNotEnoughResourcesForDeployment,
 			})
 		}
diff --git a/config/store/json.go b/config/store/json.go
index 976d18a0..91a200e1 100644
--- a/config/store/json.go
+++ b/config/store/json.go
@@ -2,8 +2,8 @@ package store
 
 import (
 	gojson "encoding/json"
+	"errors"
 	"fmt"
-	"os"
 	"path/filepath"
 
 	"github.com/datarhei/core/v16/config"
@@ -121,8 +121,12 @@ func (c *jsonStore) load(cfg *config.Config) error {
 		return nil
 	}
 
-	if _, err := c.fs.Stat(c.path); os.IsNotExist(err) {
-		return nil
+	if _, err := c.fs.Stat(c.path); err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			return nil
+		}
+
+		return err
 	}
 
 	jsondata, err := c.fs.ReadFile(c.path)
diff --git a/iam/access/adapter.go b/iam/access/adapter.go
index 23926df2..e444e793 100644
--- a/iam/access/adapter.go
+++ b/iam/access/adapter.go
@@ -2,8 +2,8 @@ package access
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
-	"os"
 	"sort"
 	"strings"
 	"sync"
@@ -63,9 +63,13 @@ func (a *adapter) LoadPolicy(model model.Model) error {
 }
 
 func (a *adapter) loadPolicyFile(model model.Model) error {
-	if _, err := a.fs.Stat(a.filePath); os.IsNotExist(err) {
-		a.domains = []Domain{}
-		return nil
+	if _, err := a.fs.Stat(a.filePath); err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			a.domains = []Domain{}
+			return nil
+		}
+
+		return err
 	}
 
 	data, err := a.fs.ReadFile(a.filePath)
diff --git a/iam/identity/adapter.go b/iam/identity/adapter.go
index d288e31d..dd21f4b6 100644
--- a/iam/identity/adapter.go
+++ b/iam/identity/adapter.go
@@ -2,8 +2,8 @@ package identity
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
-	"os"
 	"sync"
 
 	"github.com/datarhei/core/v16/io/fs"
@@ -48,8 +48,12 @@ func (a *fileAdapter) LoadIdentities() ([]User, error) {
 	a.lock.Lock()
 	defer a.lock.Unlock()
 
-	if _, err := a.fs.Stat(a.filePath); os.IsNotExist(err) {
-		return nil, nil
+	if _, err := a.fs.Stat(a.filePath); err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			return nil, nil
+		}
+
+		return nil, err
 	}
 
 	data, err := a.fs.ReadFile(a.filePath)
diff --git a/restream/store/json/json.go b/restream/store/json/json.go
index 2ca51b65..cf8237d3 100644
--- a/restream/store/json/json.go
+++ b/restream/store/json/json.go
@@ -2,8 +2,8 @@ package json
 
 import (
 	gojson "encoding/json"
+	"errors"
 	"fmt"
-	"os"
 	"sync"
 
 	"github.com/datarhei/core/v16/encoding/json"
@@ -180,9 +180,8 @@ type storeVersion struct {
 func (s *jsonStore) load(filepath string, version uint64) (Data, error) {
 	r := NewData()
 
-	_, err := s.fs.Stat(filepath)
-	if err != nil {
-		if os.IsNotExist(err) {
+	if _, err := s.fs.Stat(filepath); err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
 			return r, nil
 		}