diff --git a/include/msched.h b/include/msched.h
index 1c04bed..35238d3 100644
--- a/include/msched.h
+++ b/include/msched.h
@@ -2160,6 +2160,7 @@ typedef struct {
   int   SPVJobIsPreemptible;        /* (config boolean) */
 
   mbool_t EnableEncryption;
+  mbool_t PercentBasedFS;
 
   char *Argv[MAX_MARG];
 
diff --git a/src/moab/MFS.c b/src/moab/MFS.c
index 279279f..50195cc 100644
--- a/src/moab/MFS.c
+++ b/src/moab/MFS.c
@@ -886,6 +886,9 @@ int MFSProcessOConfig(
 
     case pFSPolicy:
 
+      if (strchr(SVal,'*'))
+        MSched.PercentBasedFS = TRUE;
+
       if (MUBoolFromString(SVal,FALSE) == TRUE)
         {
         /* enable backlevel support */ 
diff --git a/src/moab/MPar.c b/src/moab/MPar.c
index 4b3da58..c7dafd2 100644
--- a/src/moab/MPar.c
+++ b/src/moab/MPar.c
@@ -2462,6 +2462,11 @@ int MParConfigShow(
 
     sprintf(Buffer,"%s%-30s  %s\n",Buffer,MParam[pFSPolicy],MFSPolicyType[F->FSPolicy]);
 
+    sprintf(Buffer,"%s%-30s  %s%s\n",
+      Buffer,
+      MParam[pFSPolicy],MFSPolicyType[F->FSPolicy],
+      (MSched.PercentBasedFS == TRUE) ? "%" : "");
+
     if ((F->FSPolicy == fspNONE) || (VFlag || (PIndex == -1) || (PIndex == pFSPolicy)))
       {
       sprintf(Buffer,"%s%-30s  %s\n",Buffer,MParam[pFSInterval],MULToTString(F->FSInterval));
diff --git a/src/moab/MPriority.c b/src/moab/MPriority.c
index efca285..964259d 100644
--- a/src/moab/MPriority.c
+++ b/src/moab/MPriority.c
@@ -761,9 +761,18 @@ int MJobGetStartPriority(
 
       if (FSTargetUsage > 0.0)
         {
-        SFactor[mpsFU] = FSTargetUsage - 
-          (J->Cred.U->F.FSUsage[0] + J->Cred.U->F.FSFactor) / 
-          (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+        if (MSched.PercentBasedFS == TRUE)
+          {
+          SFactor[mpsFU] =  1.0 - 
+            (((J->Cred.U->F.FSUsage[0] + J->Cred.U->F.FSFactor) / 
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0)/FSTargetUsage);
+          }
+        else
+          {
+          SFactor[mpsFU] = FSTargetUsage - 
+            (J->Cred.U->F.FSUsage[0] + J->Cred.U->F.FSFactor) / 
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+          }
 
         switch(FSMode)
           {
@@ -797,9 +806,18 @@ int MJobGetStartPriority(
  
       if (FSTargetUsage > 0.0)
         {
-        SFactor[mpsFG] = FSTargetUsage -
-          (J->Cred.G->F.FSUsage[0] + J->Cred.G->F.FSFactor) /
-          (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+        if (MSched.PercentBasedFS == TRUE)
+          {
+          SFactor[mpsFU] =  1.0 - 
+            (((J->Cred.G->F.FSUsage[0] + J->Cred.G->F.FSFactor) / 
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0)/FSTargetUsage);
+          }
+        else
+          {
+          SFactor[mpsFG] = FSTargetUsage -
+            (J->Cred.G->F.FSUsage[0] + J->Cred.G->F.FSFactor) /
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+          }
  
         switch(FSMode)
           {
@@ -833,9 +851,18 @@ int MJobGetStartPriority(
       {
       if (J->Cred.A != NULL)
         {
-        SFactor[mpsFA] = FSTargetUsage -
-          (J->Cred.A->F.FSUsage[0] + J->Cred.A->F.FSFactor) /
-          (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+        if (MSched.PercentBasedFS == TRUE)
+          {
+          SFactor[mpsFA] = 1.0 -
+            (((J->Cred.A->F.FSUsage[0] + J->Cred.A->F.FSFactor) /
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0)/FSTargetUsage);
+          }
+        else
+          {
+          SFactor[mpsFA] = FSTargetUsage -
+            (J->Cred.A->F.FSUsage[0] + J->Cred.A->F.FSFactor) /
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+          }
         }
       else
         {
@@ -873,9 +900,18 @@ int MJobGetStartPriority(
       {
       if (J->Cred.C != NULL)
         {
-        SFactor[mpsFC] = FSTargetUsage -
-          (J->Cred.C->F.FSUsage[0] + J->Cred.C->F.FSFactor) /
-          (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+        if (MSched.PercentBasedFS == TRUE)
+          {
+          SFactor[mpsFC] = 1.0 -
+            (((J->Cred.C->F.FSUsage[0] + J->Cred.C->F.FSFactor) /
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0)/FSTargetUsage); 
+          }
+        else
+          {
+          SFactor[mpsFC] = FSTargetUsage -
+            (J->Cred.C->F.FSUsage[0] + J->Cred.C->F.FSFactor) /
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+          }
         }
       else
         {
@@ -913,9 +949,18 @@ int MJobGetStartPriority(
       {
       if (J->Cred.Q != NULL)
         {
-        SFactor[mpsFQ] = FSTargetUsage -
-          (J->Cred.Q->F.FSUsage[0] + J->Cred.Q->F.FSFactor) /
-          (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+        if (MSched.PercentBasedFS == TRUE)
+          {
+          SFactor[mpsFQ] = 1.0 - 
+            (((J->Cred.Q->F.FSUsage[0] + J->Cred.Q->F.FSFactor) /
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0)/FSTargetUsage);
+          }
+        else
+          {
+          SFactor[mpsFQ] = FSTargetUsage -
+            (J->Cred.Q->F.FSUsage[0] + J->Cred.Q->F.FSFactor) /
+            (GP->F.FSUsage[0] + GP->F.FSFactor) * 100.0;
+          }
         }
       else
         {