[dm-devel] multipath table for MSA-1000

[Shyam Sundar]

Is there any configuration parameter in dm to issue a
failover command (in this case probably a START_STOP
command) on the MSA so the failover happens
automatically when the primary path is not available ?


--- Christophe Varoqui <christophe.varoqui at free.fr>
wrote:

> Le lundi 08 mai 2006 à 22:43 +0100, Shyam Sundar a
> écrit :
> > I have a single port qla2342 initiator connected
> to a
> > MSA-1000 through a Switch.
> > The two ports of the MSA 1000 are connected to the
> > switch exposing 2 paths to the target LUNs. 
> > When I display the topology using
> > 
> > multipath -ll
> > 
> > i get the output as follows:
> > 3600805................
> > [size=9GB][features=1
> queue_if_no_path][hwhandler=0]
> > \_round-robin 0 [prio=1][active]
> >  \_ 17:0:0:3 sda 8:0 [failed][faulty]
> >  \_ 17:0:1:3 sdi  8:128[active][ready]
> > 3600805................
> > ..............................
> > ..............................
> > 
> > 
> > Is it normal for a MSA1000 target to have a
> "faulty"
> > and a "ready" path. 
> 
> It is, as this hardware is active/passive.
> Which is not, is the multibus topology, where you
> should use group by
> serial or failover.
> 
> > If yes, what does "faulty" signify
> > ?
> 
> It means the path is not useable as-is. It is
> activated only when
> necesary or when asked to.
> 
> >  
> > Under what condition does the faulty path become
> > ready?
> 
> "sg_start" the path or play with the LU ownership on
> the MSA management
> console.
> 
> Regards,
> cvaroqui
> 
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> 



		
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