Re: [developer] panic inside lmrc driver

[Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>]

On Mon, Aug 26, 2024 at 08:30:47AM -0400, manipm via illumos-developer wrote:
> I am also facing lmrc driver issue.  I recently purchased DELL R750xs with PERC H755(in passthrough mode) consisting of 5disk.
> 
> I am running latest DELL BIOS. Can someone help me on this.

I'm sorry that you ran into that problem. 

https://www.illumos.org/issues/15935

This is a known problem with the DELL PERC H755 which already occured
during the late stages of the driver development. The HBA firmware
pretty much drops dead after a while for no apparent reason, whether the
HBA is under load or completely idle. After a warm reset, the UEFI firmware
complains that it doesn't even see the device on the bus, and a full
power cycle is required to get the controller going again.

We've tried to root-cause this with the help from DELL and Broadcom, but
they didn't ever tell us what really happened to their firmware, nor
what our driver did to cause this. (That is not to say that our driver
did anything wrong in particular, nor that anything a driver could
possibly do should ever be considered an excuse for the HBA firmware to
behave that way.)

That being said, the PERC H355 worked flawlessly with lmrc, and so did
HBAs from other vendors such as Intel.


Hans


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