// errors on a previous write(2) operation are reported only on the final close() that releases
	// the open file descriptor.
	//
	// Failing to check the return value when closing a file may lead to silent loss of data.
	// This can especially be observed with NFS and with disk quota.
	return w.Close()
}

	}

	atomic.StoreInt64(&p.health.lastStarted, time.Now().UnixNano())
	p.health.waiting.Add(1)

	ctx = context.WithValue(ctx, healthDiskCtxKey{}, &healthDiskCtxValue{lastSuccess: &p.health.lastSuccess})
	si := p.updateStorageMetrics(s, paths...)
	var once sync.Once
	return ctx, func(errp *error) {
		p.health.waiting.Add(-1)
		once.Do(func() {
			if errp != nil {
				err := *errp

			Optional:    true,
			Type:        "number",
		},
		config.HelpKV{
			Key:         apiRequestsDeadline,
			Description: `set the deadline for API requests waiting to be processed` + defaultHelpPostfix(apiRequestsDeadline),
			Optional:    true,
			Type:        "duration",
		},
		config.HelpKV{
			Key:         apiClusterDeadline,

			retries++
			// after 20 retries start logging that servers are not reachable yet
			if retries >= 20 {
				logger.Info(fmt.Sprintf("Waiting for at least %d remote servers with valid configuration to be online", len(clnts)/2))
				if len(offlineEndpoints) > 0 {
					logger.Info(fmt.Sprintf("Following servers are currently offline or unreachable %s", offlineEndpoints))

	}
}

func getNodeDriveWaitingIOMD() MetricDescription {
	return MetricDescription{
		Namespace: nodeMetricNamespace,
		Subsystem: driveSubsystem,
		Name:      "io_waiting",
		Help:      "Total number I/O operations waiting on drive",
		Type:      counterMetric,
	}
}

func getNodeDriveFreeBytesMD() MetricDescription {
	return MetricDescription{
		Namespace: nodeMetricNamespace,

	// Migrate storage format if needed.
	for {
		// Migrate IAM configuration, if necessary.
		if err := saveIAMFormat(retryCtx, sys.store); err != nil {
			if configRetriableErrors(err) {
				logger.Info("Waiting for all MinIO IAM sub-system to be initialized.. possible cause (%v)", err)
				time.Sleep(time.Duration(r.Float64() * float64(time.Second)))
				continue
			}

		HTTPStatusCode: 499, // No official code, use nginx value.
	},
	ErrTooManyRequests: {
		Code:           "TooManyRequests",
		Description:    "Deadline exceeded while waiting in incoming queue, please reduce your request rate",
		HTTPStatusCode: http.StatusServiceUnavailable,
	},
	ErrUnsupportedMetadata: {
		Code:           "InvalidArgument",

	}

	// Return error when quorum unformatted disks - indicating we are
	// waiting for first server to be online.
	unformattedDisks := quorumUnformattedDisks(sErrs)
	if unformattedDisks && !firstDisk {
		return nil, nil, errNotFirstDisk
	}

	// Return error when quorum unformatted disks but waiting for rest
	// of the servers to be online.
	if unformattedDisks && firstDisk {

	driveTimeoutErrorsTotal      = "timeout_errors_total"
	driveIOErrorsTotal           = "io_errors_total"
	driveAvailabilityErrorsTotal = "availability_errors_total"
	driveWaitingIO               = "waiting_io"
	driveAPILatencyMicros        = "api_latency_micros"
	driveHealing                 = "healing"
	driveOnline                  = "online"

	driveOfflineCount = "offline_count"
	driveOnlineCount  = "online_count"

	defer close(cacheStmt.prepared)

	// Reason why cannot lock conn.PrepareContext
	// suppose the maxopen is 1, g1 is creating record and g2 is querying record.
	// 1. g1 begin tx, g1 is requeue because of waiting for the system call, now `db.ConnPool` db.numOpen == 1.
	// 2. g2 select lock `conn.PrepareContext(ctx, query)`, now db.numOpen == db.maxOpen , wait for release.