Re: [dm-devel] Question regarding failback option in multipath.conf

On Fri, Oct 2, 2009 at 8:30 AM, John Brier <jbrier redhat com> wrote:

On 10/01/2009 09:01 PM, Eli Klein wrote:

Sorry, I forgot to mention that I did.. it didn't help.
In addition, from the output of multipath -v3, multipathd is picking up all
of the correct settings, even with the two separate default sections.

It seems like you set it all up right but failback isn't working like it *seems* it should. (I have never needed it) If you're interested in a hack..

Since you don't seem to care how long it takes to failover, you could do the *opposite* of what this kbase recommends:

How can I improve the failover time of a faulty path when using device-mapper-multipath over iSCSI?

http://kbase.redhat.com/faq/docs/DOC-2877

Aside from that I would suggest you open a support case with Red Hat if the box is covered under a support contract.

John Brier

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I've seen that doc before (it was helpful!). Unfortunately, I *do* care about how long it takes for the initial failover. I have this configured to take 15 seconds at the moment. One thing that's interesting is that even when I had "node.session.timeo.replacement_timeout" set to 120 seconds, the failback was still immediate. The initial failover would take at minimum 120 seconds.

All of my problems seem to be cause by what appears to be a failback parameter that doesn't actually have any effect. I'll have to open up a support case to get to the bottom of the failback issues.

Thank you very much for your help!

-Eli