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December 2nd, 2024 21:08
How to bypass the 405-AAZE : PERC H755N Front RAID controller
I have a PowerEdge R7525 that currently has the 405-AAZE : PERC H755N Front RAID controller.
I am looking for the cables required to delete the PERC so I can direct-attach the 379-BDSX : NVMe Backplane to the 384-BCWO : PowerEdge R7525 Motherboard.
This backplane is 8xNVMe and has 4 cables connecting it to the PERC. Would the C47DK cable be appropriate? The set contains 2 cables, would I need two sets?
Which motherboard PCIe headers would I connect them all to?
My goal is to be able to directly address all 8 NVMe drives using 4x lanes per drive.
Thanks
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DELL-Chris H
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December 3rd, 2024 21:14
PGR7W does look correct, and is also supported on the R7525 platform.
DELL-Joey C
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December 3rd, 2024 02:57
Hi,
I'm curious that you had 4 cables connecting to the fPERC, but based on the cabling guide, I'm not able to find the configuration that you are on.
Based on the guide, which configuration are you intending to recable to? https://dell.to/3Z9TKJG Figure 8. 8 x 2.5-inch with NVMe?
I'm not able to search on 379-BDSX, it is not a part number. Can you provide us the part number which is stated on the backplane.
JakeMohnkern
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December 3rd, 2024 13:45
Joey, the cabling diagram is extremely useful, thanks.
On the page you referenced, Figure 8. 8 x 2.5-inch with NVMe is probably the desired configuration but I am not sure of the effects of removing the jumpers between SL1-SL3 and SL2-SL4. Figure 9 would also do the job, each seems to provide 32 PCIe lanes to the backplane.
This server previously had a GPU and Figure 12 represents the current cabling. The GPU was removed so I have plenty of free PCIe lanes to work with.
Can you help me identify the part numbers for the cables in Fig 8 and 9?
Figure 8 seems to be part number C47DK which contains 2 cables.
Thanks again
JakeMohnkern
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December 3rd, 2024 15:27
The backplane is part number YD2C2
JakeMohnkern
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December 3rd, 2024 20:08
Correction, the cable set in figure 8 looks like Dell part number PGR7W. The labels on each cable end match what I see on the backplane and motherboard. Can you confirm that part number will work?