[OpenIndiana-discuss] sas multipath

[Randy S]

Hi Jason,

In our case, when we connected all the stuff the system only saw one path. We had to add the SEAGATE-ST33000650SS (3 TB) specs to scsi_vhci.conf and use logical-block for the two paths to become visible.
But this was because we followed the howto's on the internet (especially the ones from oracle), which all stated that stmsboot needed to be done first.
So I will definitely undo all en restart again and tell you about the results.

Which sas drives do you use?

Thanks for your input.

Randy





> CC: openindiana-discuss at openindiana.org
> From: jason at broken.net
> Date: Wed, 6 Feb 2013 20:29:15 -0800
> To: openindiana-discuss at openindiana.org
> Subject: Re: [OpenIndiana-discuss] sas multipath
> 
> 
> randy,
> 
> if you do absolutely nothing special - meaning no stmsboot or anything else - the mpt2 driver will default to round robin. failover is sub-sub second. 
> 
> my configuration works like this and is based on 151a1.  if you undo all the old school fancy stuff it will "just work"
> 
> thanks,
> j. 
> 
> Sent from Jasons' hand held
> 
> On Feb 6, 2013, at 4:03 AM, Randy S <sim.ple at live.nl> wrote:
> 
> > 
> > Hi all,
> > 
> > I have a test system running with OIa7, very much ram, 2 LSI SAS 9207-4i4e hba's, 1 sm jbod containing seagate 3Tb sas drives. 
> > 
> > I have enabled the multipathing with stmsboot and set it to use logical-blocksize, since round-robin symmetric-option isn't functioning.
> > 
> > During tests I can see that the system sees the two path's  with mpathadm and simple dd tests show that all disks are all accessed at almost maximum speed with minimum latency according to iostat. 
> > We started to test with 4 sas disks in 2 striped mirrors. 
> > 
> > All good, but shouldn't it be possible to pull one of the sas cables without any disruption to the storage, forcing it to use only one path? (this way simulating a broken hba).
> > When we do this, the whole system grinds to a screeching halt, being almost unresponsive.
> > 
> > What am I doing wrong. Maybe somebody can point in in the right direction to troubleshoot.
> > 
> > Rgrds,
> > 
> > Randy
> > 
> > 
> > 
> > 
> > 
> >                         
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