<user>@<hostname>:~$ sudo dmsetup table
mpath2: 0 8388608 multipath 1 queue_if_no_path 0 1 1 round-robin 0 4 1 8:48 
1000 8:96 1000 8:144 1000 8:192 1000 
mpath1: 0 8388608 multipath 1 queue_if_no_path 0 1 1 round-robin 0 4 1 8:128 
1000 8:32 1000 8:80 1000 8:176 1000 
mpath0: 0 1048576000 multipath 1 queue_if_no_path 0 1 1 round-robin 0 4 1 8:160 
1000 8:16 1000 8:64 1000 8:112 1000 
test2-lvol0: 0 8380416 linear 8:192 384
test-lvol0: 0 8380416 linear 8:176 384
<vgname2>-san: 0 1048567808 linear 8:160 384
<vgname>-slash: 0 48824320 linear 8:1 384
<vgname>-swap: 0 9764864 linear 8:1 48824704

----

<user>@<hostname>:~$ sudo echo "show config" | sudo multipathd -k
multipathd> show config
defaults {
        user_friendly_names yes
}
blacklist {
        devnode ^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*
        devnode ^hd[a-z]
        devnode ^dcssblk[0-9]*
        devnode ^cciss!c[0-9]d[0-9]*
        wwid 3600605b0039afe20ff000054052e7d38
        device {
                vendor DGC
                product LUNZ
        }
        device {
                vendor IBM
                product S/390.*
        }
}
blacklist_exceptions {
}
devices {
        device {
                vendor APPLE*
                product Xserve RAID 
                path_grouping_policy multibus
        }
        device {
                vendor 3PARdata
                product VV
                path_grouping_policy multibus
        }
        device {
                vendor DEC
                product HSG80
                path_grouping_policy group_by_prio
                path_checker hp_sw
                features 1 queue_if_no_path
                hardware_handler 1 hp_sw
                prio_callout /sbin/mpath_prio_hp_sw /dev/%n
        }
        device {
                vendor HP
                product A6189A
                path_grouping_policy multibus
                path_checker readsector0
        }
        device {
                vendor (COMPAQ|HP)
                product (MSA|HSV)1.0.*
                path_grouping_policy group_by_prio
                path_checker hp_sw
                features 1 queue_if_no_path
                hardware_handler 1 hp_sw
                prio_callout /sbin/mpath_prio_hp_sw /dev/%n
        }
        device {
                vendor HP
                product MSA VOLUME
                path_grouping_policy group_by_prio
                path_checker tur
                prio_callout /sbin/mpath_prio_alua /dev/%n
                failback immediate
        }
        device {
                vendor (COMPAQ|HP)
                product (MSA|HSV)1.1.*
                path_grouping_policy group_by_prio
                path_checker tur
                prio_callout /sbin/mpath_prio_alua /dev/%n
                failback immediate
        }
        device {
                vendor HP
                product HSV2.*
                path_grouping_policy group_by_prio
                path_checker tur
                prio_callout /sbin/mpath_prio_alua /dev/%n
                failback immediate
        }
        device {
                vendor HP
                product LOGICAL VOLUME.*
                path_grouping_policy multibus
                getuid_callout /lib/udev/scsi_id -n -g -u -d /dev/%n
                path_checker tur
        }
        device {
                vendor DDN
                product SAN DataDirector
                path_grouping_policy multibus
        }
        device {
                vendor EMC
                product SYMMETRIX
                path_grouping_policy multibus
                getuid_callout /lib/udev/scsi_id -g -u -ppre-spc3-83 -d /dev/%n
                path_checker readsector0
        }
        device {
                vendor DGC
                product .*
                product_blacklist LUNZ
                path_grouping_policy group_by_prio
                path_checker emc_clariion
                features 1 queue_if_no_path
                hardware_handler 1 emc
                prio_callout /sbin/mpath_prio_emc /dev/%n
                failback immediate
                no_path_retry 60
        }
        device {
                vendor FSC
                product CentricStor
                path_grouping_policy group_by_serial
                path_checker readsector0
        }
        device {
                vendor (HITACHI|HP)
                product OPEN-.*
                path_grouping_policy multibus
                path_checker tur
                features 1 queue_if_no_path
        }
        device {
                vendor HITACHI
                product DF.*
                path_grouping_policy group_by_prio
                path_checker tur
                features 1 queue_if_no_path
                prio_callout /sbin/mpath_prio_hds_modular /dev/%n
                failback immediate
        }
        device {
                vendor IBM
                product ProFibre 4000R
                path_grouping_policy multibus
                path_checker readsector0
        }
        device {
                vendor IBM
                product 1742
                path_grouping_policy group_by_prio
                path_checker tur
                prio_callout /sbin/mpath_prio_rdac /dev/%n
                failback immediate
        }
        device {
                vendor IBM
                product 3526
                path_grouping_policy group_by_prio
                path_checker tur
                prio_callout /sbin/mpath_prio_rdac /dev/%n
                failback immediate
        }
        device {
                vendor IBM
                product 3542
                path_grouping_policy group_by_serial
                path_checker tur
        }
        device {
                vendor IBM
                product 2105(800|F20)
                path_grouping_policy group_by_serial
                path_checker tur
                features 1 queue_if_no_path
        }
        device {
                vendor IBM
                product 1750500
                path_grouping_policy group_by_prio
                path_checker tur
                features 1 queue_if_no_path
                prio_callout /sbin/mpath_prio_alua /dev/%n
                failback immediate
        }
        device {
                vendor IBM
                product 2107900
                path_grouping_policy multibus
                path_checker tur
                features 1 queue_if_no_path
        }
        device {
                vendor IBM
                product 2145
                path_grouping_policy group_by_prio
                path_checker tur
                features 1 queue_if_no_path
                prio_callout /sbin/mpath_prio_alua /dev/%n
                failback immediate
        }
        device {
                vendor IBM
                product S/390 DASD ECKD
                product_blacklist S/390.*
                path_grouping_policy multibus
                getuid_callout /sbin/dasdinfo -u -b %n
                features 1 queue_if_no_path
        }
        device {
                vendor NETAPP
                product LUN.*
                path_grouping_policy group_by_prio
                path_checker readsector0
                features 1 queue_if_no_path
                prio_callout /sbin/mpath_prio_netapp /dev/%n
                failback immediate
                rr_min_io 128
        }
        device {
                vendor IBM
                product Nseries.*
                path_grouping_policy group_by_prio
                path_checker readsector0
                features 1 queue_if_no_path
                prio_callout /sbin/mpath_prio_netapp /dev/%n
                failback immediate
                rr_min_io 128
        }
        device {
                vendor Pillar
                product Axiom.*
                path_grouping_policy group_by_prio
                path_checker tur
                prio_callout /sbin/mpath_prio_alua %n
        }
        device {
                vendor SGI
                product TP9[13]00
                path_grouping_policy multibus
                path_checker readsector0
        }
        device {
                vendor SGI
                product TP9[45]00
                path_grouping_policy group_by_prio
                path_checker rdac
                prio_callout /sbin/mpath_prio_rdac /dev/%n
                failback immediate
                no_path_retry queue
        }
        device {
                vendor SGI
                product IS.*
                path_grouping_policy group_by_prio
                path_checker rdac
                prio_callout /sbin/mpath_prio_rdac /dev/%n
                failback immediate
                no_path_retry queue
        }
        device {
                vendor STK
                product OPENstorage D280
                path_grouping_policy group_by_prio
                path_checker tur
                prio_callout /sbin/mpath_prio_rdac /dev/%n
                failback immediate
        }
        device {
                vendor SUN
                product (StorEdge 3510|T4)
                path_grouping_policy multibus
                path_checker readsector0
        }
}
multipaths {
}
multipathd>

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https://bugs.launchpad.net/bugs/1020436

Title:
  Cannot read superblock after FC multipath failover

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