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11-09-2005 05:58 PM
11-09-2005 05:58 PM
We have ordered a DL585 with 2 x FCA2214 and running Suse Linux Enterprise Server 9 (SLES 9). This will be connected to an EMC CX500 through an EMC DC24(?) FC switch. 2 FC paths to the switch and 2 FC paths from the switch to the storage array.
The SLES 9 doco (for SP2) mentions the availability of MPIO in the kernel (module?).
I know the Qlogic drivers support multipath failover themselves.
Where is the best place (tool) to implement multipath failover?
Solved! Go to Solution.
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11-09-2005 06:32 PM
11-09-2005 06:32 PM
Re: Multipath with kernel MPIO or Qlogic drivers?
In our environment we always use the Qlogic driver. We don't have any bad experience with this driver
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11-10-2005 08:59 AM
11-10-2005 08:59 AM
SolutionThe main advantage of implementing multipath at the lowest level (Qlogic driver) is more flexibility offered in operating system configuration. For example : device naming convention stay standard (/dev/sdXXX or /dev/cciss/...).
My feeling is that it would be better for performance too, but I have no facts to argue that.
Good lcuk.
Kodjo
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11-10-2005 03:26 PM
11-10-2005 03:26 PM
Re: Multipath with kernel MPIO or Qlogic drivers?
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11-10-2005 04:31 PM
11-10-2005 04:31 PM
Re: Multipath with kernel MPIO or Qlogic drivers?
Given the config mentioned at the start of this thread (inlc. SLES9 SP2);
EMC's doco states - "Neither PowerPath nor the v2.6.x kernel native failover (MPIO) functionality is supported with this Linux distribution."
Suse explicitly mention EMC Clarion CX as supported by the kernel MPIO in SLES9 SP2. In fact it is the "only" MPIO that Novell support in SLES9.
I haven't found much from Qlogic yet.
HP has doco on Qlogic multipath but with no mention of Clarion's.
http://h20000.www2.hp.com/bizsupport/TechSupport/CoreRedirect.jsp?redirectReason=DocIndexPDF&prodSeriesId=421487&targetPage=http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00169487/c00169487.pdf
Which of these takes precedent or more importantly who do I trust our company infrastructure to?
I realise that having single server and storage vendor would have simplified things but that hasn't happened.
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11-10-2005 06:19 PM
11-10-2005 06:19 PM
Re: Multipath with kernel MPIO or Qlogic drivers?
Who is going to support the solution ? If you purchased the SuSE distro from HP, then it is HP. In that case I would recommend that you follow HP recommendations.
Good lcuk.
Kodjo
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11-29-2005 07:20 PM
11-29-2005 07:20 PM
Re: Multipath with kernel MPIO or Qlogic drivers?
Qlogic - recommended by a couple of posts here.
Kernel MPIO - supported by Suse.
Vendor positions
EMC: Qlogic is a no go (word of mouth). Linux kernel MPIO is unlikely to be supported for reasons of "investment" (email, awaiting official letter).
HP: do whatever EMC tell you to do.
Further advice always appreciated.
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