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Re: [dm-devel] Multipath and SAN Fabric failover



Heya,

I think you should just try an empty multipath.conf, only put the blacklist in. The EMC CX needs pp_emc as prio callout for example. The defaults within multipath should just work. Also make sure your failovermode and arraycommpath are both set to 1. A few hints are mentioned on http://christophe.varoqui.free.fr/wiki/wakka.php?wiki=TestedEnvironments
Please fill in if you find something that's missing there.

Best regards,

Bernd Zeimetz


John Little wrote:
Hi all,

I am trying to setup our server so that we have fabric failover from
the san.  However my file sytem comes up read-only when I pull a cable
for testing.

I am using the following:
SLES 10
multipath-tools-0.4.6-25.8
q-logic 2342 dual port hba
emc cx600 san
(4) McData DS-24 switches (2 for fabric a and 2 for fabric b)



/etc/multipath.conf has the following entries:

xen2:~ # grep -v "#" /etc/multipath.conf
defaults {
        udev_dir                /dev
        polling_interval        10
        selector                "round-robin 0"
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        prio_callout            /bin/true
        failback                immediate
}
devnode_blacklist {
        device {
                vendor SEAGATE
                product ST973401LSUN72G
        }
}
multipaths {
        multipath {
                wwid                    360060160f06109004352b218eb51da11
                alias                   capsprod
                path_grouping_policy    failover
                path_checker            readsector0
                path_selector           "round-robin 0"
                failback                immediate
        }
}

Can someone point me in the right direction to get this resolved?

Best regards,
John Little, Network Systems
Hendricks Regional Health
http://hendrickshospital.org

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