Disk duplicates with dual-port HBA

TrueNAS General
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I have set up TrueNas on a Dell R630 which is booting off SSD and using another internal SSD for the ZFS scratch disk. It has an external array of 24 SAS disks attached to it, which is an old Dell SC220 disk shelf from our retired Compellent storage array. It’s basically a dual-controller SAS box.

Each controller on the card has two SAS Ports, so I’ve connected the HBA in the server to one port of each controller. However, Truenas is reporting that there are multiple disks with non-unique serial numbers, which I suppose if it’s seeing each disk reported twice (once from each controller) is technically correct.

Was this a sensible cabling choice? From a resilience point of view I would have thought so (if one controller dies the other should take over) but things may be different in TrueNas land.

Is there a way to tell Truenas that the disks are in the same unit, and it might want to be doing something like Multipath IO?

Thanks,

James

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You basically set up multipathing if i understood you correctly, which is not supported in truenas. remove 1 connected cable. This should fix it.

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Fair enough! Thanks for the quick confirmation.

J