@anzo@programming.dev is correct, it’s the order you connected them in (see tldp). Use UUIDs or devices lables for consistency or connect them in the order you want.
AFAIK the a-b-c enumeration comes from hardware, so for example whichever sata port you use in a motherboard would always get the same identifier. You’d need to turn off all four nodes and check the disks are indeed connected in exactly the same ports. If that fails, then I’d assume the motherboards are from different batched or soldered differently for whatever reasons.
I have four identical machines. Each with the following set of disks:
2x NVMe
2x 2.5" SSD
4x 3.5" HDD in hardware RAID6
now, the device nodes for the SSDs and the RAID seems random. These populate /dev/sda through sdc, but which is which varies between the machines.
Is it possible to somehow reassign the device nodes so that I have the RAID show up as sdc on all machines?
@anzo@programming.dev is correct, it’s the order you connected them in (see tldp). Use UUIDs or devices lables for consistency or connect them in the order you want.
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AFAIK the a-b-c enumeration comes from hardware, so for example whichever sata port you use in a motherboard would always get the same identifier. You’d need to turn off all four nodes and check the disks are indeed connected in exactly the same ports. If that fails, then I’d assume the motherboards are from different batched or soldered differently for whatever reasons.
How about using labels in etc-fstab ? That should be all you really need to be able to refer to disks in a cohesive fashion between nodes.