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Ubuntu Server 20.04.3
Linux 5.4.0-89-generic
Dell Poweredge R630
Atto H1280 GT SAS HBA
Jetstor 824JXD storage shelf
22x Toshiba MG07SCA12TE 12TB SAS drives

I set all of this up on a bench and connected the shelf to the head with a pair of mini-SAS SFF-8644 cables and Ubuntu detected the 22 SAS drives in the shelf as expected. I then shipped everything to a datacentre where remote hands racked and recabled it all. Now that I'm able to ssh into the system, I see that Ubuntu is detecting 44 SAS drives, as evidenced by fdisk and the contents of /dev/, /sys/block/, /sys/class/sas_*/, etc.

It appears that the SAS drives are being detected twice and I have no idea why it would be when it didn't on the bench. Given that the shelf has more than two SAS ports, I suppose this has something to do with how it has been cabled, although I don't have those details at the moment.

Is this something to do with multipath? Is it a good thing or a bad thing? I have some experience with drive shelves and HBAs, but I have no experience with multipath and this is something I've never seen before. Any help in identifying what's going on here and recommendations on configuring the hardware or software are appreciated.
11-24-2021, 04:23 PM
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