Hi, I'm a bit confused by your question the 'drive bays' or backplane is the same for an NVMe system, it's either a SATA/SAS/NVME backplane or a NVMe backplane. I don't understand why you believe that my configuration has to be 3.5" as it isn't. It's a 16x2.5" chassis with two H755N controllers (one for each set of 8 drives). The H755N controller is a hardware raid adapter for NVMe. I hope this clarifies the confusion. Thank you, -Drew -----Original Message----- From: Frank Schilder <frans@xxxxxx> Sent: Thursday, July 11, 2024 9:57 AM To: Drew Weaver <drew.weaver@xxxxxxxxxx>; 'ceph-users@xxxxxxx' <ceph-users@xxxxxxx> Subject: Re: Repurposing some Dell R750s for Ceph Hi Drew, as far as I know Dell's drive bays for RAID controllers are not the same as the drive bays for CPU attached disks. In particular, I don't think they have that config for 3.5" drive bays and your description sounds a lot like that's what you have. Are you trying to go from 16x2.5" HDD to something like 24xNVMe? Maybe you could provide a bit more information here, like (links to) the wiring diagrams you mentioned? From the description I cannot entirely deduce what exactly you have and where you want to go to. Best regards, ================= Frank Schilder AIT Risø Campus Bygning 109, rum S14 ________________________________________ From: Drew Weaver <drew.weaver@xxxxxxxxxx> Sent: Thursday, July 11, 2024 3:16 PM To: 'ceph-users@xxxxxxx' Subject: Repurposing some Dell R750s for Ceph Hello, We would like to repurpose some Dell PowerEdge R750s for a Ceph cluster. Currently the servers have one H755N RAID controller for each 8 drives. (2 total) I have been asking their technical support what needs to happen in order for us to just rip out those raid controllers and cable the backplane directly to the motherboard/PCIe lanes and they haven't been super enthusiastic about helping me. I get it just buy another 50 servers, right? No big deal. I have the diagrams that show how each configuration should be connected, I think I just need the right cable(s), my question is has anyone done this work before and was it worth it? Also bonus if anyone has an R750 that has the drives directly connected to the backplane and can find the part number of the cable that connects the backplane to the motherboard I would greatly appreciate that part number. My sales guys are "having a hard time locating it". Thanks, -Drew _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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