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Fibre chanel path selection

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Fibre chanel path selection

Subject: Fibre chanel path selection
From: Alain Renaud <email@hidden>
Date: Thu, 10 Feb 2011 15:46:05 -0500


Hello all,

I have a question about SCSI FibreChanel connection. I have the following setup. A Mac with 10.6 that has a LSI HBA from Apple. I connect the 2 ports of the HBA on a FibreChanel switch, at the other end I have a FibreChanel Raid with one port connected to the switch. Now I would expect the kernel to give me 2 path (disk device) to the same raid unit Like it does on Linux / Windows /Solaris / AIX and friends. However the MAC only give me one disk. The problem is that if I want to select which path to use to get to the disk it does not seem to be possible.... is there a way to tell the kernel to generate one disk device per path it find?

If I look at the output of ioreg I notice the following. For every path available I get one unique IOSCSIParallelInterfaceDevice (note the id are different)

FC Target 200400A0B8119204@4 <class IOSCSIParallelInterfaceDevice, id 0x1000002c6, registered FC Target 200400A0B8119204@5 <class IOSCSIParallelInterfaceDevice, id 0x1000002d0, !registered

However these 2 entry seem to point to the SAME IOSCSITargetDevice child. FC Target 200400A0B8119204@4 <class IOSCSIParallelInterfaceDevice, id 0x1000002c6, registered IOSCSITargetDevice <class IOSCSITargetDevice, id 0x1000002c8, registered FC Target 200400A0B8119204@5 <class IOSCSIParallelInterfaceDevice, id 0x1000002d0, !registered IOSCSITargetDevice <class IOSCSITargetDevice, id 0x1000002c8, registered SAS Target 63843B29A29C9189@3 <class IOSCSIParallelInterfaceDevice, id 0x1000002a7, registered

look at the id 0x1000002c8 they are the same.. From that point on it goes down the tree with the same information which at the end give me the SAME BSD device...

With that how can I select which path I want to use to get to the raid?

Any help will be welcome as this is causing me a lot of grief

Thanks.

--
===============================================
Alain Renaud     - Cluster File System Engineer
email@hidden  - SGI
===============================================

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