[Bug 60644] MPT2SAS drops all HDDs when under high I/O

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60644

--- Comment #37 from Jeff Johnson <jeff.johnson@aeoncomputing.com> ---
I can confirm Tommy's observations about disabling PERR and SERR solving the
issue.

The motherboard I am using (Supermicro X8DTH-iF) does not have those exact BIOS
settings to control. In my case the following BIOS changes and kernel command
line arguments eliminated the issue:

MB BIOS: BIOS->Advanced->Advanced Chipset Configuration->North Bridge
Configuration->ASPM=Disabled

Linux boot command line options: pcie_aspm=off disable_msi=1 

With these changes a very intense fio run has gone four days without a single
error or issue on a Linux-ZFS filesystem.

Before these changes I could not go four hours without multiple HBAs
disappearing (in my config there are three HBAs). Sometimes the HBAs would
disappear within 15-20 minutes of benchmark runtime.

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