I have a 44-bay Supermicro JBOD which is connected to a MegaRAID 9280-8e. Upon boot, all drives show activity and the device scan reaches 100%. Then however, an eror message states:
Invalid SAS topology, please check your cabling, fix and restart.
(Or something highly similar, this is from memory).
The RAID controller has proven to work on a different JBOD and I was unable to find any option in the RAID or system BIOS related to SAS topology, so I assume it has to be some issue with the JBOD.
I did the following steps to identify the problem:
I pulled all disks to verify it's not an issue caused by a single faulty drive. The error message remains identical ("Invalid SAS topology")
I verified the internal SAS cabling is accodring the backplanes manuals (IN -> backplane1 -> backplane2 -> IN/OUT).
Leaving the system running for a while, it repeatedly prints the "Invalid SAS topology" error but eventually continues and allows to enter the RAID configuration tool. Once there I see all disks and can even assemble RAID6 volumes. The volumes are still there on next boot, as is the error message "Invalid SAS topology".
I am quite puzzled and would be very grateful for any help or suggestions.
