Hi, Thanks for the link. I also read this page a few weeks ago and went with the iostat -xnzY 5 command. I think it will be difficult to determine if this is an OI issue or a hardware issue. I also noticed that the system responds differently depending on which cable you remove. Main responses being either stopping ( or becomming unresponsive) immediately, or stopping when you plug the cable back in.
don't really know where to look next. Rgds, Randy > From: [email protected] > To: [email protected] > Date: Thu, 7 Feb 2013 09:09:48 +0100 > Subject: Re: [OpenIndiana-discuss] sas multipath > > -----Original message----- > From: Randy S <[email protected]> > Sent: Wed 06-02-2013 13:03 > Subject: [OpenIndiana-discuss] sas multipath > To: [email protected]; > > > > 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 > > > > > > > > > > > > > > _______________________________________________ > > OpenIndiana-discuss mailing list > > [email protected] > > http://openindiana.org/mailman/listinfo/openindiana-discuss > > > > Hi Randy, > > we set up sas multipath here with 151a7 (Supermicro JBOD, LSI SAS > Controller). We tested failover as well. It worked, almost: after > disconnecting one cable everything continued to work, BUT when reconnecting > the cable, the system stopped working until rebooted. > > We didn't find the reason for this, so far. > > If you are laying with MPXIO you might take a look into vhci_stat: > (http://southbrain.com/south/software/vhci-stat.html) > > > cu > > Carsten > > _______________________________________________ > OpenIndiana-discuss mailing list > [email protected] > http://openindiana.org/mailman/listinfo/openindiana-discuss _______________________________________________ OpenIndiana-discuss mailing list [email protected] http://openindiana.org/mailman/listinfo/openindiana-discuss
