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Advanced Raid Calculation explained
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Advanced RAID 5 Explained

Example: HP Proliant DL380.

System description:.
  • HP Proliant DL380 server (Windows 2003)
  • HP Smart Array 5i Controller
  • 6 - 36Gig SCSI drives
  • basic Block size: 32 sectors (16K)
  • Parity Cluster size: 16 Blocks (Raid order listed below)

The Raid configuration of the array is such that standard Data Recovery tools such as R-Studio or UFS Explorer although fine for most standard Raid formats, cannot be used to extract data from such a complex Raid configuration. The solution was to reverse engineer the Raid and build software to re-assemble the broken Raid. Note: this software is custom designed for this Server and is for use by our Raid Data Recovery Labs, is is not for sale.

RAID ARRAY CONFIGURATION:

BLOCK
Sector Offset HD0 HD1 HD2 HD3 HD4 HD5
1089 0 1 2 3 4 P
1121 5 6 7 8 9 P
1153 10 11 12 13 14 P
1185 15 16 17 18 19 P
1217 20 21 22 23 24 P
1249 25 26 27 28 29 P
1281 30 31 32 33 34 P
1313 35 36 37 38 39 P
1345 40 41 42 43 44 P
1377 45 46 47 48 49 P
1409 50 51 52 53 54 P
1441 55 56 57 58 59 P
1473 60 61 62 63 64 P
1505 65 66 67 68 69 P
1537 70 71 72 73 74 P
1569 75 76 77 79 79 P
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Parity Order:

CLUSTER ORDER
Sector Offset HD0 HD1 HD2 HD3 HD4 HD5
1089 0 1 2 3 4 P
1601 5 6 7 8 P 9
2113 10 11 12 P 13 14
2626 15 16 P 17 18 19
3137 20 P 21 22 23 24
3649 P 25 26 27 28 29
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Acknowledgements