[OmniOS-discuss] OmniOS Panic on high ZFS Write Load

[Dan McDonald]

On May 16, 2014, at 12:57 PM, Rune Tipsmark <rt at steait.net> wrote:

> Hi guys,
> 
> After having tried various distros as mentioned and after having tried SLC and MLC PCI-E devices as well as SSD disks I think I actually found the issue.
> 
> Previously I had a bunch of SATA disks connected to my SAS controller as well as a bunch of SAS disks... now that I removed the SATA disks and only have SAS disks left I have not been able to reproduce the issue (regardless the fact I didn't even use the SAS controller for some tests that crashes). Very weird and what a waste of a few hundred hours of reinstalling/testing, swapping cables, switches, memory, messing with bios settings and what have we.
> 
> I now have two stable pools which each write a reasonable ~430 MB/sec with sync=always on without crashing.
> 
> Lesson - stay far away from SATA disks on LSI 9207-4i4e

Were you using a JBOD or other expander?  I've *heard* you can direclty attach SATA disks to an mpt_sas board if you're careful.

But generally speaking, it's operationally foolish to attach SATA drives anywhere other than to dedicated SATA ports.

Thanks,
Dan