I'm afraid I don't know the answer to that, sorry.  Not sure if anyone does... 
I think the SCSI HBA driver is the same on SPARC64 as on AMD64, but then Sun 
had a habit of "improving" control interfaces for Solaris so who knows.  I do 
know under Solaris there is a bioctl-like tool to manage it, for what that's 
worth.
-Adam

On December 28, 2017 1:32:40 PM CST, Jordan Geoghegan <[email protected]> 
wrote:
>Yes I had considered using the onboard hardware raid, but I don't 
>particularly trust it. I also need the ability to rebuild my arrays 
>while the machine is online and was hoping to be able to do the 3 disk 
>RAID1 offered by OpenBSD softraid. Do you know if bioctl(8) is capable 
>of controlling the onboard raid controller, or will I need to do all 
>raid rebuilds via the hardware raid bios on the T4?
>
>
>On 12/28/17 08:58, Adam Thompson wrote:
>> On 2017-12-26 14:56, Jordan wrote:
>>> I've recently gotten my hands on a couple shiny new SPARC T4-1 and
>>> T3-1 servers and I was looking to install OpenBSD with a softraid
>>> mirror on them for production use. The problem is, is that I end up
>>> with this upon following the install instructions and rebooting:
>>
>> FWIW...
>> AFAIK every single T4-1 (probably T3-1s but not certain) is capable
>of 
>> hardware RAID-0/1/10 on the SCSI controller, and that's how they're 
>> shipped from Sun/Oracle even when running Solaris. I'm not absolutely
>
>> certain that it's supported by OpenBSD, but I do recall seeing that
>it 
>> could be used as-is when I was investigating running OpenBSD on my 
>> T-series gear.  There's Oracle documentation on how to access the 
>> on-card firmware to set up and manage the RAID set in a pre-OS
>situation.
>>
>> YMMV.  Unfortunately, both of mine are still running Solaris so I 
>> can't confirm right now.
>> -Adam

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