[dm-devel] multipath and san fabric
Edward Goggin
egoggin at emc.com
Tue Nov 14 20:41:44 UTC 2006
> -----Original Message-----
> From: dm-devel-bounces at redhat.com
> [mailto:dm-devel-bounces at redhat.com] On Behalf Of John Little
> Sent: Tuesday, November 14, 2006 8:09 AM
> To: dm-devel at redhat.com
> Cc: James.Smart at emulex.com; goggin, edward
> Subject: RE: [dm-devel] multipath and san fabric
>
> Hi all
>
> Wow. thanks for the responses...
>
> James Smart <James.Smart at 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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