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RE: [dm-devel] multipath and san fabric



> -----Original Message-----
> From: dm-devel-bounces redhat com 
> [mailto:dm-devel-bounces redhat com] On Behalf Of John Little
> Sent: Tuesday, November 14, 2006 8:09 AM
> To: dm-devel redhat com
> Cc: James Smart emulex com; goggin, edward
> Subject: RE: [dm-devel] multipath and san fabric
> 
> Hi all
> 
> Wow.  thanks for the responses...
> 
> James Smart <James Smart Emulex Com> wrote on 11/13/2006 02:54:15 PM:
> 
> > >>> Example 2:
> > >>>    Fabric A contains HBA1, TargetPort1, and TargetPort3. 
> > >>> Typically a zone
> > >>>      would exist within Fabric A that contains these 3 ports.
> > >>>    Fabric B contains HBA2, TargetPort2, and TargetPort4. 
> > >>> Typically a zone
> > >>>      would exist within Fabric B that contains these 3 ports.
> > >>>    The storage array contains 2 controllers, with 2 ports per 
> > >>> controller.
> > >>>      Meaning TargetPort1 and TargetPort2 are on controller A, 
> > >>> and TargetPort3
> > >>>      and TargetPort4 are on controller B. The ports are cross 
> > >>> connected on
> > >>>      the fabrics for redundancy. All storage can be seen from 
> > >>> any port.
> > >>>    --
> > >>>    This would ahve 4 DM paths
> > >>>    The I_T nexus's are:
> > >>>       HBA1_TargetPort1
> > >>>       HBA1_TargetPort3
> > >>>       HBA2_TargetPort2
> > >>>       HBA2_TargetPort4
> 
> Ok I'm new to SAN and multipathing so maybe it's just the way 
> it is worded.  
> Here is what we have and the instructions that were given to me.
> ####
> FCSW00 xxx.xxx.xxx.233 Fabric A 
> FCSW01 xxx.xxx.xxx.234 Fabric B
> FCSW02 xxx.xxx.xxx.235 Fabric A
> FCSW03 xxx.xxx.xxx.236 Fabric B
> 
> Summary: One HBA is attached to each fabric; two zones per 
> HBA. One is zoned 
> to a port on SPA and one is zoned to a port on SPB We have a 
> CX600 which has 
> 4 ports per SP. So, it could be zoned to SPA0 (0-3)and SPB0(0-3)
> ####
> 
> If I understand correctly what I have is Example 2 (typo 
> corrected).

Yes, you have a modified version of James's "Example 2",
since you have 4 ports per CLARiiON controller instead of 2. 

> Then I 
> would, for an hba connected to Fabric A on a port on FCSW00, 
> setup a zone on 
> FCSW00 and another on FCSW02.  The same would apply for the 
> hba in Fabric B 
> using FCSW01 and FCSW03.

You need only configure a single zone for the active zone set
for each fabric as shown below using your terminology from above
to refer to the CLARiiON SP (A,B) and ports (0,1,2,3).

      Fabric A zone = {HBA1, SPA0, SPB0}
	Fabric B zone = {HBA2, SPA1, SPB1}

> 
> Is this correct or am I still lost?
> 
> Thanks,
> John
> 
> 
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