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I'll have to research how well FreeBSD can control the fans in an R720.

I may have access to an IBM FRU 46M0861 (LSI SAS9220-8i)ServeRaid M10158 , would this be suitable for the purpose of driving the backplane in JBOD/ZFS ?

Hmm, thanks for the info. I should probably verify that these Constellation.2 drives power up on 5v only.

Yeah all of our stuff is hardware raid still. Unless you count the witchcraft that NetApp does as software raid. Which I would say it is except it requires the NetApp hardware...

I did some digging and almost all of the servers we get have H7xx cards. Why is it that these (I assume) higher end cards are less capable than the 3xx series?

Yeah, checked the cable there's no printing on it at all. The power wires to the backplane are yellow/grey/black, they aren't very long, will be a bit cumbersome. I wish there was a better way to run OS drives separate from the array in this thing. I did some digging, there's PCIE cards and...

I want to run a pair of these "Dell Constellation.2" drives. 2.5" 500GB 7200RPM SATAs. On 5v they indicate 0.8A max, do you think the 5v lines for the optical would handle 1.6A ?

That's what I was thinking, the drives I want to use appear to indicate that they need the 12v line as well? They say "RATED: +5v 0.80A +12v 0.20A"

In an unrelated note, I was planning on using a pair of 2.5" SATA drives hanging out in the rear of the R720 for the OS, however there's no power back there. Any ideas on getting SATA power near the back of the machine?

Matt G I found this: Updated: SAS HBA crossflashing or flashing to IT mode, Dell Perc H200 and H310 Which specifically says do not do this on Mini cards.

Well, I definitely don't want the fans to spin up. Are there ANY Dell controllers that allow disk passthru? I tend to have access to a lot of Dell parts, though a quick check shows mostly PERC6/i as the cards in the other readily accessible machines.

H220 looks reasonably priced on ebay, lots of sellers advertising "IT Mode" etc. I'll have to get new cabling as the R720 cabling uses the single double-wide to two smaller SAS cables, ie...

I have acquired a decent R720 but unfortunately the backplane is powered by an H710 Mini which from my research (eg. https://forums.servethehome.com/index.php?threads/jbod-adventures-with-dell-perc-h710p-mini-lsi-2208.22019/ ) does NOT support pass through and my ZFS system will be sad. What's...