distributed-XL: Support to run one minio process per export even on the same machine. (#2999)

fixes #2983

cmd/prepare-storage.go

@@ -20,7 +20,6 @@ import (
 	"time"
 
 	"github.com/minio/mc/pkg/console"
-	"github.com/minio/minio-go/pkg/set"
 )
 
 // Channel where minioctl heal handler would notify if it were successful. This
@@ -250,34 +249,35 @@ func retryFormattingDisks(firstDisk bool, firstEndpoint string, storageDisks []S
 }
 
 // Initialize storage disks based on input arguments.
-func initStorageDisks(disks, ignoredDisks []string) ([]StorageAPI, error) {
+func initStorageDisks(endPoints, ignoredEndPoints []storageEndPoint) ([]StorageAPI, error) {
 	// Single disk means we will use FS backend.
-	if len(disks) == 1 {
-		storage, err := newStorageAPI(disks[0])
+	if len(endPoints) == 1 {
+		storage, err := newStorageAPI(endPoints[0])
 		if err != nil && err != errDiskNotFound {
 			return nil, err
 		}
 		return []StorageAPI{storage}, nil
-	} // Otherwise proceed with XL setup.
-	if err := checkSufficientDisks(disks); err != nil {
-		return nil, err
-	}
-	disksSet := set.NewStringSet()
-	if len(ignoredDisks) > 0 {
-		disksSet = set.CreateStringSet(ignoredDisks...)
 	}
+	// Otherwise proceed with XL setup.
 	// Bootstrap disks.
-	storageDisks := make([]StorageAPI, len(disks))
-	for index, disk := range disks {
+	storageDisks := make([]StorageAPI, len(endPoints))
+	for index, ep := range endPoints {
 		// Check if disk is ignored.
-		if disksSet.Contains(disk) {
+		ignored := false
+		for _, iep := range ignoredEndPoints {
+			if ep == iep {
+				ignored = true
+				break
+			}
+		}
+		if ignored {
 			// Set this situation as disk not found.
 			storageDisks[index] = nil
 			continue
 		}
 		// Intentionally ignore disk not found errors. XL is designed
 		// to handle these errors internally.
-		storage, err := newStorageAPI(disk)
+		storage, err := newStorageAPI(ep)
 		if err != nil && err != errDiskNotFound {
 			return nil, err
 		}