Uncovering the Truth about HBAs and SMART data 

Excellent info! Thank you for clearly articulating the problem. Finding good content like this is so refreshing. I uncovered this same info when I was trying to figure out why I couldn't get SMART data in FreeNAS on my non-IT mode H310. Once I figured out how to flash it to IT mode and read through the pages describing the process I found the info about the driver. I'm looking forward to more content from you! Thanks again!

SO glad to get this straightened out! I have a R320 server with an H200 raid card and I was seriously considering flashing to IT mode.

Very informative. Such a world of difference when you have the time to rtfm and know what you're doing :) Thanks for sharing.

very informative. so, freenas devel team instead of fixing the bug and updating their drivers/utils/os etc, they just went with the "modern" solution, "don't use raid controllers" when this is clearly not a hardware problem. ok god to know. just wait till ppl start using nvme for their storage and then wonder why the performance is so so bad. freebsd is very behind in supporting new drivers, new schedulers and bleeding edge hardware. i think amazon aws had their first series problems with nvme performance. this will be fun!!!!

This was SUPER HELPFUL! I have a H700 with all my drives in a raid 0 vitual disk for each physical disk. I had tried the normal smartctl commands in TrueNas as well as the gui with negative results. Now i know i have to use the proper commands to get that smart info and ill be fine. Only question i have to ask. With this setup do i have to worry about rebuilding a failed drive when that happens. I mean will i beable to pop in a new drive make sure its initialized on the raid controller and import it into the data pool to replace the failed drive without issue?

Great video! I'm using M1015 megaraid card without changing it to IT mode and without defining any disk - it simply shows in the boot the disks as "JBOD disks" On FreeNAS latest it is indeed using the MFI driver and smartctl shows everything. One thing that I didn't see in your video: in IT mode, does FreeBSD and Linux shows the full output of smartctl for the drives?

Never mind accessing SMART data, I have an R420 with an H710p Mini and it wouldn't access 8Tb drives. I flashed it to IT mode last night and it works with 8Tb just fine now.

Nice to know 👍

Lots of people say truenas scale not stable in jbod mode. Can you do a video on jbod mode vs hba it mode. To sounds the same.

/dev/bus/0 would be the mask I think, and does obfuscate the way to get the smart data. that...quote very much looks like its from the freenas forum, and they ...definitely tend to just simplify things. for example, instead of explaining the correct ways that you *could* use SAS1 controllers, they would just say "do not use sas1 controllers", or "do not virtualize freenas unless you already know what you are doing". same thing with RAID controllers + zfs; there are cases where, if configured correctly you could use them, but so many ppl kill their pools, and then go to the forums in desparation because they don't know what they are doing, that it is safer to just blanket exclude them and avoid the hassle entirely, particularly because some raid controllers add extra stuff to the disk in "jbod or raid0" modes, that mangles the data on those disks if used with other controllers (hp). zfs does not care that you lost your mothers pictures because you didn't have a proper back, or were using IR instead of IT, and looks on indifferently as you struggle to learn what you did wrong.

Another lesson learned

Is there a way to get S.M.A.R.T data in freenas for SAS HDD?

Most awesome ebay seller indeed. I want to buy a server so I can buy a card from you! :D:D:D *** I can buy without even using a server but let's not be excessive... ahhaah

Amazing