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device-mapper mutlipath not handling well for SAN events

edited Aug 31, 2011 2:09AM in Linux Operating System (MOSC) 3 commentsAnswered
 Hi Gurus,

We are evaluating to run Oracle on Linux with SAN attached. We need to make sure multipath working. We tried the device mapper mutlipath, but it did not handel well for SAN events. For example, when disabling SAN switch port, we see IO haning for more than 20 seconds.  This's not acceptable. Can anyone share your expeience? Is this kind of expected in Linux environment?

Hardware env:
X86 Server: HP DL380G6 16x 2.27GHz cpu thread, 72G Mem, 8x146G; QLE2460 HBA.
SAN switch: Brocade SW300 x 2
Storage Array: IBM XIV
Connection topology(4Gbps ):
IBM XIV have 12 ports connect to SAN switch (each switch 6)

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