ARPL has made a huge difference in my journey to get DSM virtualized on my Dell Poweredge T550. I thought I would add a few notes here if anyone is trying to get this working with the same hardware.
The T550 came with a Dell PERC H345 RAID controller. I've got this set to JBOD currently as I did not want to do hardware RAID. I wanted to flash IT mode firmware here, but this runs on the newer SAS3416 (SAS 3.5 gen), which so far does not have a flashing guide available.
I had planned on keeping my current Proxmox install and using PCI passthrough to give all of the attached disks to the DSM VM. Unfortunately with the Dell PERC firmware, there are some memory mapping issues that require a lot of tinkering in Proxmox to get around. I switched to ESXi as it is a little more stable and requires less work to PCI passthrough a controller card.
The next hurdle was getting DSM to recognize the PERC H345. The included megaraid_sas kernel module is a few years old and did not have the correct vendor and device IDs to recognize the H345. I went to Broadcom's support site and downloaded a more recent version of their MegaRAID Linux driver, which includes the megaraid_sas kernel module source code.
Using the Synology open source DSM 7 kernel source tree and the DSM 7 tool chain, you can build the kernel source to get a newer kernel module that is still compatible with the Linux kernel version DSM uses. After that, I booted ARPL config and edited the ramdisk patch script to also copy over the custom built kernel module. Used wget and a local file server to get the built module copied over.
Thanks to everyone's hard work and all the documentation available here! It is impressive to see this getting easier to pull off compared to a few years ago.
