Re: Presenting LUN over FC with multiple paths (qla2xxx, targetcli)

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Hi Konrad,

On Thu, 2013-07-18 at 17:30 +0200, Konrad Ludwikowski wrote:
> Hello,
> 
> I want to present LUNs from my linux box to one of the Storage
> Virtualizators (FalconStor in that case). I did simple configuration:
> 
> /> ls
>   o- qla2xxx ...........................................................................................................
> [2 Targets]
>   | o- 50:01:43:80:24:d7:af:08
> ...........................................................................................
> [enabled]
>   | | o- acls .............................................................................................................
> [2 ACLs]
>   | | | o- 50:01:43:80:24:d7:ad:18
> ..................................................................................
> [1 Mapped LUN]
>   | | | | o- mapped_lun0
> ...............................................................................................
> [lun0 (rw)]
>   | | | o- 50:01:43:80:24:d7:ae:80
> ..................................................................................
> [1 Mapped LUN]
>   | | |   o- mapped_lun0
> ...............................................................................................
> [lun0 (rw)]
>   | | o- luns ..............................................................................................................
> [1 LUN]
>   | |   o- lun0
> ....................................................................................
> [iblock/cache1pri (/dev/fioa1)]
>   | o- 50:01:43:80:24:d7:af:0a
> ...........................................................................................
> [enabled]
>   |   o- acls .............................................................................................................
> [2 ACLs]
>   |   | o- 50:01:43:80:24:d7:ad:1a
> ..................................................................................
> [1 Mapped LUN]
>   |   | | o- mapped_lun0
> ...............................................................................................
> [lun0 (rw)]
>   |   | o- 50:01:43:80:24:d7:ae:82
> ..................................................................................
> [1 Mapped LUN]
>   |   |   o- mapped_lun0
> ...............................................................................................
> [lun0 (rw)]
>   |   o- luns ..............................................................................................................
> [1 LUN]
>   |     o- lun0
> ....................................................................................
> [iblock/cache1pri (/dev/fioa1)]
>   o- tcm_fc .............................................................................................................
> [0 Target]
> 
> As a result - I can see on the virtualizator "iblock/cache1pri" via
> two paths. So far so good.

That all looks fine.

> But -  Unfortunatelly I cannot use the presented space because I'm
> getting the message on the virtualizator: "LUN - Not Supported for
> path failover and load ballancing"

So explicit/implicit ALUA multipath is enabled by default on all
exported fabric LUNs.  There is nothing extra required to configure for
the default case.

Not sure why Falconstor is having problems with standard ALUA.  I assume
this is using their own multipath logic, and not the Linux native
dm-multipath, right..?

--nab

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