Index: sys/dev/mpr/mpr.c
===================================================================
--- sys/dev/mpr/mpr.c
+++ sys/dev/mpr/mpr.c
@@ -1376,6 +1376,7 @@
 	sc->max_io_pages = MPR_MAXIO_PAGES;
 	sc->enable_ssu = MPR_SSU_ENABLE_SSD_DISABLE_HDD;
 	sc->spinup_wait_time = DEFAULT_SPINUP_WAIT;
+	sc->use_phynum = 1;
 
 	/*
 	 * Grab the global variables.
@@ -1387,6 +1388,7 @@
 	TUNABLE_INT_FETCH("hw.mpr.max_io_pages", &sc->max_io_pages);
 	TUNABLE_INT_FETCH("hw.mpr.enable_ssu", &sc->enable_ssu);
 	TUNABLE_INT_FETCH("hw.mpr.spinup_wait_time", &sc->spinup_wait_time);
+	TUNABLE_INT_FETCH("hw.mpr.use_phy_num", &sc->use_phynum);
 
 	/* Grab the unit-instance variables */
 	snprintf(tmpstr, sizeof(tmpstr), "dev.mpr.%d.debug_level",
@@ -1421,6 +1423,10 @@
 	snprintf(tmpstr, sizeof(tmpstr), "dev.mpr.%d.spinup_wait_time",
 	    device_get_unit(sc->mpr_dev));
 	TUNABLE_INT_FETCH(tmpstr, &sc->spinup_wait_time);
+
+	snprintf(tmpstr, sizeof(tmpstr), "dev.mpr.%d.use_phy_num",
+	    device_get_unit(sc->mpr_dev));
+	TUNABLE_INT_FETCH(tmpstr, &sc->use_phynum);
 }
 
 static void
@@ -1510,6 +1516,10 @@
 	    OID_AUTO, "spinup_wait_time", CTLFLAG_RD,
 	    &sc->spinup_wait_time, DEFAULT_SPINUP_WAIT, "seconds to wait for "
 	    "spinup after SATA ID error");
+
+	SYSCTL_ADD_INT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
+	    OID_AUTO, "use_phy_num", CTLFLAG_RD, &sc->use_phynum, 0,
+	    "Use the phy number for enumeration");
 }
 
 int
Index: sys/dev/mpr/mpr_sas_lsi.c
===================================================================
--- sys/dev/mpr/mpr_sas_lsi.c
+++ sys/dev/mpr/mpr_sas_lsi.c
@@ -757,13 +757,24 @@
 		}
 	}
 
-	id = mpr_mapping_get_sas_id(sc, sas_address, handle);
+	/*
+	 * use_phynum:
+	 *  1 - use the PhyNum field as a fallback to the mapping logic
+	 *  0 - never use the PhyNum field
+	 * -1 - only use the PhyNum field
+	 */
+	id = MPR_MAP_BAD_ID;
+	if (sc->use_phynum != -1) 
+		id = mpr_mapping_get_sas_id(sc, sas_address, handle);
 	if (id == MPR_MAP_BAD_ID) {
-		printf("failure at %s:%d/%s()! Could not get ID for device "
-		    "with handle 0x%04x\n", __FILE__, __LINE__, __func__,
-		    handle);
-		error = ENXIO;
-		goto out;
+		if ((sc->use_phynum == 0)
+		 || ((id = config_page.PhyNum) > sassc->maxtargets)) {
+			mpr_dprint(sc, MPR_INFO, "failure at %s:%d/%s()! "
+			    "Could not get ID for device with handle 0x%04x\n",
+			    __FILE__, __LINE__, __func__, handle);
+			error = ENXIO;
+			goto out;
+		}
 	}
 
 	if (mprsas_check_id(sassc, id) != 0) {
@@ -772,9 +783,16 @@
 		goto out;
 	}
 
+	targ = &sassc->targets[id];
+	if (targ->handle != 0x0) {
+		mpr_dprint(sc, MPR_MAPPING, "Attempting to reuse target id "
+		    "%d handle 0x%04x\n", id, targ->handle);
+		error = ENXIO;
+		goto out;
+	}
+
 	mpr_dprint(sc, MPR_MAPPING, "SAS Address from SAS device page0 = %jx\n",
 	    sas_address);
-	targ = &sassc->targets[id];
 	targ->devinfo = device_info;
 	targ->devname = le32toh(config_page.DeviceName.High);
 	targ->devname = (targ->devname << 32) | 
Index: sys/dev/mpr/mprvar.h
===================================================================
--- sys/dev/mpr/mprvar.h
+++ sys/dev/mpr/mprvar.h
@@ -271,6 +271,7 @@
 	uint16_t			chain_seg_size;
 	u_int				enable_ssu;
 	int				spinup_wait_time;
+	int				use_phynum;
 	uint64_t			chain_alloc_fail;
 	struct sysctl_ctx_list		sysctl_ctx;
 	struct sysctl_oid		*sysctl_tree;
Index: sys/dev/mps/mps.c
===================================================================
--- sys/dev/mps/mps.c
+++ sys/dev/mps/mps.c
@@ -1353,6 +1353,7 @@
 	sc->max_io_pages = MPS_MAXIO_PAGES;
 	sc->enable_ssu = MPS_SSU_ENABLE_SSD_DISABLE_HDD;
 	sc->spinup_wait_time = DEFAULT_SPINUP_WAIT;
+	sc->use_phynum = 1;
 
 	/*
 	 * Grab the global variables.
@@ -1364,6 +1365,7 @@
 	TUNABLE_INT_FETCH("hw.mps.max_io_pages", &sc->max_io_pages);
 	TUNABLE_INT_FETCH("hw.mps.enable_ssu", &sc->enable_ssu);
 	TUNABLE_INT_FETCH("hw.mps.spinup_wait_time", &sc->spinup_wait_time);
+	TUNABLE_INT_FETCH("hw.mps.use_phy_num", &sc->use_phynum);
 
 	/* Grab the unit-instance variables */
 	snprintf(tmpstr, sizeof(tmpstr), "dev.mps.%d.debug_level",
@@ -1398,6 +1400,10 @@
 	snprintf(tmpstr, sizeof(tmpstr), "dev.mps.%d.spinup_wait_time",
 	    device_get_unit(sc->mps_dev));
 	TUNABLE_INT_FETCH(tmpstr, &sc->spinup_wait_time);
+
+	snprintf(tmpstr, sizeof(tmpstr), "dev.mps.%d.use_phy_num",
+	    device_get_unit(sc->mps_dev));
+	TUNABLE_INT_FETCH(tmpstr, &sc->use_phynum);
 }
 
 static void
@@ -1495,6 +1501,10 @@
 	SYSCTL_ADD_PROC(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
 	    OID_AUTO, "encl_table_dump", CTLTYPE_STRING | CTLFLAG_RD, sc, 0,
 	    mps_mapping_encl_dump, "A", "Enclosure Table Dump");
+
+	SYSCTL_ADD_INT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
+	    OID_AUTO, "use_phy_num", CTLFLAG_RD, &sc->use_phynum, 0,
+	    "Use the phy number for enumeration");
 }
 
 int
Index: sys/dev/mps/mps_sas_lsi.c
===================================================================
--- sys/dev/mps/mps_sas_lsi.c
+++ sys/dev/mps/mps_sas_lsi.c
@@ -669,13 +669,24 @@
 		}
 	}
 
-	id = mps_mapping_get_sas_id(sc, sas_address, handle);
+	/*
+	 * use_phynum:
+	 *  1 - use the PhyNum field as a fallback to the mapping logic
+	 *  0 - never use the PhyNum field
+	 * -1 - only use the PhyNum field
+	 */
+	id = MPS_MAP_BAD_ID;
+	if (sc->use_phynum != -1) 
+		id = mps_mapping_get_sas_id(sc, sas_address, handle);
 	if (id == MPS_MAP_BAD_ID) {
-		printf("failure at %s:%d/%s()! Could not get ID for device "
-		    "with handle 0x%04x\n", __FILE__, __LINE__, __func__,
-		    handle);
-		error = ENXIO;
-		goto out;
+		if ((sc->use_phynum == 0)
+		 || ((id = config_page.PhyNum) > sassc->maxtargets)) {
+			mps_dprint(sc, MPS_INFO, "failure at %s:%d/%s()! "
+			    "Could not get ID for device with handle 0x%04x\n",
+			    __FILE__, __LINE__, __func__, handle);
+			error = ENXIO;
+			goto out;
+		}
 	}
 
 	if (mpssas_check_id(sassc, id) != 0) {
@@ -684,9 +695,16 @@
 		goto out;
 	}
 
+	targ = &sassc->targets[id];
+	if (targ->handle != 0x0) {
+		mps_dprint(sc, MPS_MAPPING, "Attempting to reuse target id "
+		    "%d handle 0x%04x\n", id, targ->handle);
+		error = ENXIO;
+		goto out;
+	}
+
 	mps_dprint(sc, MPS_MAPPING, "SAS Address from SAS device page0 = %jx\n",
 	    sas_address);
-	targ = &sassc->targets[id];
 	targ->devinfo = device_info;
 	targ->devname = le32toh(config_page.DeviceName.High);
 	targ->devname = (targ->devname << 32) | 
Index: sys/dev/mps/mpsvar.h
===================================================================
--- sys/dev/mps/mpsvar.h
+++ sys/dev/mps/mpsvar.h
@@ -285,6 +285,7 @@
 	int				chain_free_lowwater;
 	u_int				enable_ssu;
 	int				spinup_wait_time;
+	int				use_phynum;
 	uint64_t			chain_alloc_fail;
 	struct sysctl_ctx_list		sysctl_ctx;
 	struct sysctl_oid		*sysctl_tree;