diff -rup grub2-1.99~rc1.orig/grub-core/kern//emu/hostdisk.c grub2-1.99~rc1/grub-core/kern//emu/hostdisk.c
--- grub2-1.99~rc1.orig/grub-core/kern//emu/hostdisk.c	2011-06-30 11:38:10.825408016 +1200
+++ grub2-1.99~rc1/grub-core/kern//emu/hostdisk.c	2011-06-30 11:32:41.455407974 +1200
@@ -454,9 +454,15 @@ find_partition_start (const char *dev)
 	grub_dprintf ("hostdisk", "no dm target\n");
 	goto devmapper_fail;
       }
-    if (strcmp (target_type, "linear") != 0)
+    if (strcmp (target_type, "striped") == 0)
       {
-	grub_dprintf ("hostdisk", "ignoring dm target %s (not linear)\n",
+	grub_dprintf ("hostdisk", "treating dm target %s (striped) as real disk\n", dev);
+	return 0;
+      }
+    if (strcmp (target_type, "linear") != 0 &&
+	strcmp (target_type, "striped") != 0 )
+      {
+	grub_dprintf ("hostdisk", "ignoring dm target %s (not linear/striped)\n",
 		      target_type);
 	goto devmapper_fail;
       }
@@ -1533,9 +1539,21 @@ static int
 device_is_wholedisk (const char *os_dev)
 {
   int len = strlen (os_dev);
+  const char *working;
 
   if (os_dev[len - 1] < '0' || os_dev[len - 1] > '9')
     return 1;
+/* dmraid devices are enumerated - e.g. /dev/mapper/isw_myuuidNAME0 but still
+   whole disk. An initial heuristic follows:
+   They are a whole disk device IFF:
+    - the name contains /dev/mapper/
+    - the name does not contain - (so NAME0-0) will not count
+    - we ignore partitions (NAME0p1) because they return non-zero partition
+      offsets and device_is_wholedisk is not called.
+ */
+  working = strstr(os_dev, "/dev/mapper/");
+  if (working != 0 && strstr(working + 12, "-") == 0)
+    return 1;
   return 0;
 }
 #endif
Only in grub2-1.99~rc1/grub-core/kern//emu: .hostdisk.c.swp