<HTML dir=ltr><HEAD><TITLE>Re: [Openib-windows] Windows SRP multipathing</TITLE>
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<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Hi Yossi, Andrey,</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Unless supported by OS, multipath DSM drivers provided by storage vendors, it is their prerogative.</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>So until HP sertified/validated OpenFabric SRP driver I do not see how HP MPIO DSM </FONT><FONT face=Arial size=2>could be used.</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>With regard to Microsoft there is a working generic DSM included in MPIO DDK, that can be used as-is if HBA+storage SPC-3 compliant. I think SRP should be just fine. What about storage?</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>Yossi, d</FONT><FONT face=Arial size=2>id you look at Microsoft DSM code?</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>Do you think it is workable alternative to team it with SRP?</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>Alex</FONT></DIV>
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<FONT face=Tahoma size=2><B>From:</B> openib-windows-bounces@openib.org on behalf of Andrey Slepuhin<BR><B>Sent:</B> Sun 12/24/2006 12:58 PM<BR><B>To:</B> Yossi Leybovich<BR><B>Cc:</B> openib-windows@openib.org<BR><B>Subject:</B> Re: [Openib-windows] Windows SRP multipathing<BR></FONT><BR></DIV>
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<P><FONT size=2>Dear Yossi,<BR><BR>I have one 2-port PCI-X HCA in each of 4 cluster nodes. Different HCA<BR>ports are connected to two different IB subnets managed by Silverstorm<BR>InfinIO 5000 switches.<BR>The switches are connected to different FC controllers on HP MSA1500cs <BR>storage using IB-FC gateway (Silverstorm VFx module). On the VFx module<BR>I mapped FC target to both IOCs. If I will map it only to one IOC, I<BR>will see each logical disc 2 times instead of 4, but there will be two<BR>SRP miniport drivers in Windows device manager marked by exclamation sign.<BR>Please note that I have 2 separate subnets. Should I connect the IB<BR>switches together to have a single subnet?<BR><BR>Regarding the disks: They are writable and they are working fine, but if<BR>I map a disk to the certain drive letter, this drive will be accessible<BR>only while the appropriate path is working.<BR><BR>HP storage has 2 active-active controllers, so the host can choose any<BR>path to access the storage. They have MPIO-based MSD drivers and the<BR>management software that allows to choose the primary and the failover<BR>paths, but this software just does not see any array devices if I'm<BR>using SRP as a SCSI driver. The same for array management utility: I can<BR>not update the firmware and configure logical volumes on the storage if<BR>I'm working through SRP driver (I was forced to plug QLogic 2340 HBA<BR>into one node to do these tasks).<BR><BR>Best regards,<BR>Andrey<BR><BR><BR>Yossi Leybovich wrote:<BR>> Hi<BR>><BR>> First I build new binaries base on revision 566.<BR>> I hope we will post it to the web early next week.<BR>> Note that the build include fix to blue screen when 2 HCA on the same<BR>> host connected to the same storage.<BR>><BR>> WinIB does support multipath but only between ports of the same HCA.<BR>> Mean if you connect both ports of the HCA to the storage they will<BR>> appear as one controller and switch if one port fail.<BR>><BR>> We just now started to look at the MPIO DDK and I hope we will be able<BR>> to support it.<BR>><BR>> Can you describe the connectivity of your network ?<BR>> Does the multiple paths is feature in the eHP storage ? Can you disable<BR>> it ?<BR>> What is the problem with multiple disks instances ? Cannot you write to<BR>> the disks ?<BR>><BR>> >From my experience with Enginio storage I just disable their fail over<BR>> feature and I did not see the multiple disks.<BR>><BR>> I hope that in the coming weeks we will be able to support MPIO.<BR>> Thakx<BR>> Yossi<BR>><BR>><BR>><BR>> <BR>>> -----Original Message-----<BR>>> From: openib-windows-bounces@openib.org<BR>>> [<A href="mailto:openib-windows-bounces@openib.org">mailto:openib-windows-bounces@openib.org</A>] On Behalf Of<BR>>> Andrey Slepuhin<BR>>> Sent: Thursday, December 21, 2006 10:25 PM<BR>>> To: Tzachi Dar<BR>>> Cc: openib-windows@openib.org<BR>>> Subject: Re: [Openib-windows] Windows SRP multipathing<BR>>><BR>>> Currently I'm running build 1.0.0.506.<BR>>><BR>>> Best regards,<BR>>> Andrey<BR>>><BR>>> Tzachi Dar wrote:<BR>>> <BR>>>> What version of openib stack are you using?<BR>>>> As far as I can tell there have been many changes in this area from<BR>>>> the last build that openib has made.<BR>>>> (this means that you will probably have to update your binaries).<BR>>>><BR>>>> Thanks<BR>>>> Tzachi<BR>>>><BR>>>> <BR>>>> <BR>>>>> -----Original Message-----<BR>>>>> From: openib-windows-bounces@openib.org<BR>>>>> [<A href="mailto:openib-windows-bounces@openib.org">mailto:openib-windows-bounces@openib.org</A>] On Behalf Of Andrey<BR>>>>> Slepuhin<BR>>>>> Sent: Thursday, December 21, 2006 4:13 PM<BR>>>>> To: openib-windows@openib.org<BR>>>>> Subject: [Openib-windows] Windows SRP multipathing<BR>>>>><BR>>>>> Dear folks,<BR>>>>><BR>>>>> We have 4-node cluster system using 2 QLogic (Silverstorm) InfinIO<BR>>>>> 5000 switches, HP DL385 servers and HP MSA1500cs storage.<BR>>>>> <BR>>> The cluster<BR>>> <BR>>>>> is working under MS Windows Server 2003 x64. We successfully<BR>>>>> installed IB stack including SRP drivers, and the logical disks on<BR>>>>> the storage are visible on the cluster nodes. The problem is that<BR>>>>> each disk is encountered 4 times due to the multiple<BR>>>>> <BR>>> paths. We tried<BR>>> <BR>>>>> HP DSM driver for Microsoft MPIO but unfortunately it<BR>>>>> <BR>>> doesn't work -<BR>>> <BR>>>>> it seems that the driver expects only QLogic and Emulex FC<BR>>>>> <BR>>> HBAs. Does<BR>>> <BR>>>>> anybody have an experience with IB SRP multipathing on<BR>>>>> <BR>>> Windows? Any<BR>>> <BR>>>>> help will be much appreciated.<BR>>>>><BR>>>>> Thanks in advance,<BR>>>>> Andrey Slepuhin,<BR>>>>> Head of Cluster Solutions Center,<BR>>>>> T-Platforms<BR>>>>><BR>>>>> <A href="http://www.t-platforms.ru/english">http://www.t-platforms.ru/english</A><BR>>>>> tel.: +7 495 9565490, +7 495 7440995<BR>>>>> fax: +7 495 9565415<BR>>>>> mob.: +7 916 1636117<BR>>>>><BR>>>>><BR>>>>> _______________________________________________<BR>>>>> openib-windows mailing list<BR>>>>> openib-windows@openib.org<BR>>>>> <A href="http://openib.org/mailman/listinfo/openib-windows">http://openib.org/mailman/listinfo/openib-windows</A><BR>>>>><BR>>>>> <BR>>>>> <BR>>> _______________________________________________<BR>>> openib-windows mailing list<BR>>> openib-windows@openib.org<BR>>> <A href="http://openib.org/mailman/listinfo/openib-windows">http://openib.org/mailman/listinfo/openib-windows</A><BR>>><BR>>> <BR><BR>_______________________________________________<BR>openib-windows mailing list<BR>openib-windows@openib.org<BR><A href="http://openib.org/mailman/listinfo/openib-windows">http://openib.org/mailman/listinfo/openib-windows</A><BR><BR></FONT></P></DIV></BODY></HTML>