HP RAID 50 NPG raid info

Lately when buying HP servers I have started seeing what looks like a new type of RAID listed when choosing RAID 50. Depending on the number of disks you have you may see the following options available as part of RAID 50.

RAID 50 NPG:2
RAID 50 NPG:3
RAID 50 NPG:4

When I asked around what these were no one seemed to know so I started creating them on a D2700 and seeing what the result was. Below is a listing of what you end up with when you create each of these. It appears all the NPG means is Number of Parity Groups. I’ve seen a lot of confusion about this both inside and outside of HP support. One advantage to this is the ability to lose more than 1 disk as long as they are different parity groups. A disadvantage is to increase storage you would need to add the number of disks you have of parity groups.

RAID 50 NPG:2
Drives Assigned to Parity Group 1
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 1
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 2
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 3
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 4
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 5
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 6

Drives Assigned to Parity Group 2
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 7
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 8
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 9
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 10
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 11
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 12

RAID 50 NPG:3
Drives Assigned to Parity Group 1
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 1
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 2
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 3
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 4

Drives Assigned to Parity Group 2
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 5
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 6
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 7
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 8

Drives Assigned to Parity Group 3
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 9
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 10
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 11
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 12

RAID 50 NPG:4
Drives Assigned to Parity Group 1
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 1
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 2
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 3

Drives Assigned to Parity Group 2
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 4
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 5
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 6

Drives Assigned to Parity Group 3
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 7
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 8
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 9

Drives Assigned to Parity Group 4
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 10
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 11
146 GB 2-Port SAS Drive at Port 2E : Box 1 : Bay 12