AIX - Does an AIX box require a reboot to reactivate a Fibre-Channel path to disk when this path is down temporarily and comes back up?

Posted on 2012-09-20
Last Modified: 2012-09-20
AIX - Does an AIX box require a reboot to reactivate a Fibre-Channel path to disk when this path is down temporarily and comes back up?

I don't think a reboot is required, but I wanted to confirm and verify whether my assumption is right or wrong?  If it does or does not require a reboot, could you please provide a breaf explanation as to why it does or doesn't need it?
Question by:AIX25
    LVL 68

    Accepted Solution

    A reboot is definitely not required, at least when using the drivers described below.

    Native MPIO has a builtin health check which brings failed paths back online, and SDDPCM contains a background process "pcmsrv" which is responsible for path recovery and rebuilding the MPIO port mapping.

    Third party drivers like  EMC PowerPath, Hitachi HDLM have path recovery mechanisms as well.

    Under some circumstances (e.g. outage too long) a failed path has to be enabled manually.
    How to do this depends on the driver used.

    Native MPIO: chpath ...

    SDDPCM:  pcmpath set ...
    "Unavailable" paths need a "cfgmgr" run, "Invalid" paths must be "open"ed explicitly and there are very rare circumstances where the mapping of MPIO ports might require further action ("enable ports ...").

    Third party drivers like PowerPath ("powermt"), Hitachi HDLM ("dlnkmgr") have their respective commands which as well should be required in very rare cases only.

    So even if some manual actions have to be taken - these actions will never comprise a reboot.

    Author Comment

    Perfect explanation! And helped me very much!  Thank you as always woolmilkporc

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