[OmniOS-discuss] iSCSI target hang, no way to restart but server reboot

[Dan McDonald]

> On Mar 27, 2015, at 10:54 AM, Matej Zerovnik <matej at zunaj.si> wrote:
> 
> I read in the archives, that this errors happens when you have SATA drives on a SAS expander and one of the drives misbehaves:
> A command did not complete and the mpt driver reset the target.
> If that target is an expander, then everything behind the expander can
> reset, resulting in the aborts of any in-flight commands, as follows...

You read correctly.  You should not have SATA drives on a SAS expander.  You are setting yourself up for failure.

> iostat -Ei | grep Error reports that one device has 6 hard errors and 6 device not ready errors, but that is a local drive, attached to a different controller (LSI Megaraid).

LSI Megaraid, ESPECIALLY with 006, is not going to be as good as either mpt_sas, or a more modern build of OmniOS (I'm hoping to get one very good change in before I close 014's illumos synching).

> I wouldn't like to do a major upgrade, since this is a production machine. Too scary:)

You should plan for it, however.  SATA drives on SAS expanders is a recipe for disaster, as you're seeing.

Dan