- **We do not recommend upgrading one MinIO server at a time, the product is designed to support parallel upgrades please follow our recommended guidelines.**

## Explore Further

- [MinIO Erasure Code Overview](https://min.io/docs/minio/linux/operations/concepts/erasure-coding.html)

	g := errgroup.WithNErrs(len(disks))

	// Start writing `xl.meta` to all disks in parallel.
	for index := range disks {
		index := index
		g.Go(func() error {
			if disks[index] == nil {
				return errDiskNotFound
			}
			// Pick one FileInfo for a disk at index.
			fi := files[index]

single process running those previous steps *even* if afterwards, you start **multiple processes** (multiple workers) for the application itself. If those steps were run by **multiple processes**, they would **duplicate** the work by running it in **parallel**, and if the steps were something delicate like a database migration, they could cause conflicts with each other.

Of course, there are some cases where there's no problem in running the previous steps multiple times, in that case, it's...

          lastGoodStreamId = streamId
          streams[streamId] = newStream

          // Use a different task queue for each stream because they should be handled in parallel.
          taskRunner.newQueue().execute("$connectionName[$streamId] onStream") {
            try {
              listener.onStream(newStream)
            } catch (e: IOException) {

	bootstrapTraceMsgFirstTime("loading policy documents")

	policyLoadStartTime := UTCNow()
	policiesList := listedConfigItems[policiesListKey]
	count := 32 // number of parallel IAM loaders
	for {
		if len(policiesList) < count {
			policyDocs, err := iamOS.loadPolicyDocConcurrent(ctx, policiesList...)
			if err != nil {
				return err
			}
			for index := range policiesList {

4 }} {{- end }} {{- if .Values.additionalAnnotation }} annotations: {{ toYaml .Values.additionalAnnotation | trimSuffix "\n" | indent 4 }} {{- end }} spec: updateStrategy: type: {{ .Values.StatefulSetUpdate.updateStrategy }} podManagementPolicy: "Parallel" serviceName: {{ template "minio.fullname" . }}-svc replicas: {{ mul $poolCount $nodeCount }} selector: matchLabels: app: {{ template "minio.name" . }} release: {{ .Release.Name }} template: metadata: name: {{ template "minio.fullname" . }} labels:...

4 }} {{- end }} {{- if .Values.additionalAnnotation }} annotations: {{ toYaml .Values.additionalAnnotation | trimSuffix "\n" | indent 4 }} {{- end }} spec: updateStrategy: type: {{ .Values.StatefulSetUpdate.updateStrategy }} podManagementPolicy: "Parallel" serviceName: {{ template "minio.fullname" . }}-svc replicas: {{ mul $poolCount $nodeCount }} selector: matchLabels: app: {{ template "minio.name" . }} release: {{ .Release.Name }} template: metadata: name: {{ template "minio.fullname" . }} labels:...

	for _, lstorageInfo := range storageInfos {
		storageInfo.Disks = append(storageInfo.Disks, lstorageInfo.Disks...)
	}

	return storageInfo
}

// Shutdown shutsdown all erasure coded sets in parallel
// returns error upon first error.
func (s *erasureSets) Shutdown(ctx context.Context) error {
	g := errgroup.WithNErrs(len(s.sets))

	for index := range s.sets {
		index := index
		g.Go(func() error {

typedef struct TFE_Executor TFE_Executor;

// Creates a new eager Executor. Nodes in one executor are guaranteed to be
// executed in sequence. Assigning nodes to different executors allows executing
// nodes in parallel.
// in_flight_nodes_limit: when is_async is true, this value controls the
// maximum number of in flight async nodes. Enqueuing of additional async ops
// after the limit is reached blocks until some inflight nodes finishes.

4 }} {{- end }} {{- if .Values.additionalAnnotation }} annotations: {{ toYaml .Values.additionalAnnotation | trimSuffix "\n" | indent 4 }} {{- end }} spec: updateStrategy: type: {{ .Values.StatefulSetUpdate.updateStrategy }} podManagementPolicy: "Parallel" serviceName: {{ template "minio.fullname" . }}-svc replicas: {{ mul $poolCount $nodeCount }} selector: matchLabels: app: {{ template "minio.name" . }} release: {{ .Release.Name }} template: metadata: name: {{ template "minio.fullname" . }} labels:...