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Home  > Data Recovery Using R-Studio > Volume Sets and RAIDs  > Working with RAIDs with Parity Delays

Working with RAIDs with Parity Delays


R-Studio allows you to create RAIDs with parity delays (any level that allows that). For example, let us create a RAID 5 the parity delays with the following layout:

• Three disks,

• Delay=16

• Block size: 16 KB

• Offset: 1088 sectors (544 KB)

• Block order: Left Asynchronous (Continuous)

Block order table:

 

A

B

C

Delay=16

1

1

2

PD

2

3

4

PD

3

5

6

PD

4

7

8

PD

5

9

10

PD

6

11

12

PD

7

13

14

PD

8

15

16

PD

9

17

18

PD

10

19

20

PD

11

21

22

PD

12

23

24

PD

13

25

26

PD

14

27

28

PD

15

29

30

PD

16

31

32

PD

17

33

PD

34

Delay=16

18

35

PD

36

19

37

PD

38

20

39

PD

40

21

41

PD

42

22

43

PD

44

23

45

PD

46

24

47

PD

48

25

49

PD

50

26

51

PD

52

27

53

PD

54

28

55

PD

56

29

57

PD

58

30

59

PD

60

31

61

PD

62

32

63

PD

64

33

PD

65

66

Delay=16

34

PD

67

68

35

PD

69

70

36

PD

71

72

37

PD

73

74

38

PD

75

76

39

PD

77

78

40

PD

79

80

41

PD

81

82

42

PD

83

84

43

PD

85

86

44

PD

87

88

45

PD

89

90

46

PD

91

92

47

PD

93

94

48

PD

95

96

To create such RAID 5,

1 Click the Create virtual volume sets or RAIDs button and select Create Virtual Block RAID & Autodetect

or select Create Virtual Block RAID & Autodetect on the Create menu

Check that the Apply changes immediately check box is clear on the Parents tab. This will prevent R-Studio from trying to start processing the RAID configuration until you specify it completely.

2 Drug the required objects from the Drives pane to the Parents tab and select RAID 5 on the RAID type

Click to expand/collapse Other ways to add objects

• Control-click the Parents tab and select the required partition from the contextual menu ,

or

• Control-click the partition on the Drives panel, select Add to RAID on the contextual menu, and select the RAID object you want to add the partition to.

These objects may be hard drives, logical disks, or images . Check that the objects are correctly placed.

Note: Objects should be placed in the same order as they were in the original RAID 5. If this order is incorrect, you must change it by dragging the parents to place them in the correct order.

Object control buttons

Locate

Click this button to locate the selected object in the Drives panel.

Add Empty Space/Add Missing Disk

Click this button to add an empty space or missing disk object to the RAID

Remove

Click this button to remove the selected object from the RAID

Move Up

Click this button to move up the selected object in the RAID

Move Down

Click this button to move down the selected object in the RAID

Synchronize Offsets

Click this button to make the offsets the same for all objects in the RAID

Reset changes

Click this button to return the configuration to the initial state (after clicking the Apply button or immediately after loading)

3 Specify the Block size and Offset parameters on the Parents tab

Disregard the Block order field.

4 Specify the parity delay number in the Parity delay control on the Parents tab.

The number of rows will change to 48.

By default, this parameter is set equal to Parity delay . By changing it, you may "shift" the block order table. For example, when the First parity parameter is set as 1 for the RAID 5 of 3 disks with Parity delay of 3., the block order table will be the following:

Click to enlarge

First parity parameter

 

5 Select Left Asynchronous (Continuous) on the Block Order Field and click the Apply button on the Parents tab
> The created Virtual Block RAID 1 object can now be processed like regular drives/volumes

If R-Studio detects a valid file system on this RAID object, a partition object will appear on the Drives panel.

The Description Files for RAID Configurations topic shows the RAID description file for this RAID configuration.

You also may check the RAID consistency, if necessary. See the Checking RAID Consistency help page for details.

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