[dm-devel] multipath table for MSA-1000

[Christophe Varoqui]

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