added raid 50

src/tools/raid-calculator/raid-calculator.service.ts

@@ -4,14 +4,14 @@ const raidCalculations = {
   raid_0: {
     about: 'RAID 0 splits data evenly across 2 or more disks without redunancy or fault tolerance creating one large storage space. More info: <a href="https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_0" target="_blank">Wikipedia</a>',
     requirements: 'RAID 0 requires at least 1 disk',
-    validate(num, size) {
+    validate(num, size, stripeSize) {
       return num > 1;
     },
-    capacity(num, size, unit) {
+    capacity(num, size, stripeSize, unit) {
       // total disks * size
       return (num * size) * unit;
     },
-    efficiency(num) {
+    efficiency(num, stripeSize) {
       // uses 100% of space
       return 100;
     },
@@ -22,14 +22,14 @@ const raidCalculations = {
   raid_1: {
     about: 'RAID 1 consists of an exact copy of the data (mirror) across two or more disks. The array will operate as long as at least one drive is operational.  More info: <a href="https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_1" target="_blank">Wikipedia</a>',
     requirements: 'RAID 1 requires at least 1 disk',
-    validate(num, size) {
+    validate(num, size, stripeSize) {
       return num > 1;
     },
-    capacity(num, size, unit) {
+    capacity(num, size, stripeSize, unit) {
       // total size is size of a single drive
       return size * unit;
     },
-    efficiency(num) {
+    efficiency(num, stripeSize) {
       // 1/N
       return (1 / num) * 100;
     },
@@ -41,14 +41,14 @@ const raidCalculations = {
   raid_5: {
     about: 'RAID 5 uses block level striping with parity. This allows for fault tolerance with a storage reduction equal to one drive for the parity information. More info: <a href="https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_5" target="_blank">Wikipedia</a>',
     requirements: 'RAID 5 requires at least 3 disks',
-    validate(num, size) {
+    validate(num, size, stripeSize) {
       return num >= 3;
     },
-    capacity(num, size, unit) {
+    capacity(num, size, stripeSize, unit) {
       // (N-1) * S (one drive for parity)
       return ((num - 1) * size) * unit;
     },
-    efficiency(num) {
+    efficiency(num, stripeSize) {
       // 1 - (1/N)
       return (1 - (1 / num)) * 100;
     },
@@ -60,14 +60,14 @@ const raidCalculations = {
   raid_6: {
     about: 'RAID 6 is similiar to RAID 5 but with an additional parity block. This allows for an additional disk failure at the cost of storage reduction equal to two drives. More info: <a href="https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_6" target="_blank">Wikipedia</a>',
     requirements: 'RAID 6 requires at least 4 disks',
-    validate(num, size) {
+    validate(num, size, stripeSize) {
       return num >= 4;
     },
-    capacity(num, size, unit) {
+    capacity(num, size, stripeSize, unit) {
       // (N-2) * S (2 parity)
       return ((num - 2) * size) * unit;
     },
-    efficiency(num) {
+    efficiency(num, stripeSize) {
       // 1 - (2/N)
       return (1 - (2 / num)) * 100;
     },
@@ -77,16 +77,16 @@ const raidCalculations = {
     },
   },
   raid_10: {
-    about: 'RAID 10 is generally recognized as a stripe of mirrors (RAID 1 + RAID 0). Each set of drives is mirrored and striped together so that each drive in the set is fault tolerant within the group. More info: <a href="https://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_10_(RAID_1+0)" target="_blank">Wikipedia</a>',
+    about: 'RAID 10 is a stripe of mirrors (RAID 1 + RAID 0). Each set of drives is mirrored and striped together so that each drive in the set is fault tolerant within the group. More info: <a href="https://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_10_(RAID_1+0)" target="_blank">Wikipedia</a>',
     requirements: 'RAID 10 requires an even number of at least 4 disks',
-    validate(num, size) {
+    validate(num, size, stripeSize) {
       return num >= 4 && num % 2 === 0;
     },
-    capacity(num, size, unit) {
+    capacity(num, size, stripeSize, unit) {
       // Total disks (stripe)/2 (mirror)
       return ((num * size) / 2) * unit;
     },
-    efficiency(num) {
+    efficiency(num, stripeSize) {
       // 1/2 (1/strips per stripe, 2 in this case)
       return 50;
     },
@@ -95,4 +95,26 @@ const raidCalculations = {
       return '1 drive failure per mirrored set';
     },
   },
+  raid_50: {
+    about: 'RAID 50 stripes multiple RAID 5 arrays together (RAID 5 + RAID 0). Each RAID 5 set can sustain a single drive failure. More info: <a href="https://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_50_(RAID_5+0)" target="_blank">Wikipedia</a>',
+    requirements: 'RAID 50 requires at least 6 disks total with 3 minimum per stripe. Stripes must contain an equal number of disks.',
+    validate(num, size, stripeSize) {
+      return num >= 6 && stripeSize >= 3 && num % stripeSize === 0;
+    },
+    capacity(num, size, stripeSize, unit) {
+      // RAID 5 per strip
+      const perStripe = ((stripeSize - 1) * size) * unit;
+
+      // sum each stripe
+      return perStripe * (num / stripeSize);
+    },
+    efficiency(num, stripeSize) {
+      // 1 - (1 / strips per stripe)
+      return (1 - (1 / stripeSize)) * 100;
+    },
+    fault(num, size, unit) {
+      // one per mirror
+      return '1 drive failure per RAID 5 set';
+    },
+  },
 };