Re: [linux-lvm] Lvm hangs on San fail

["jose nuno neto" <jose.neto@liber4e.com>]

GoodMornings

This is what I have on multipath.conf

blacklist {
        wwid SSun_VOL0_266DCF4A
        wwid SSun_VOL0_5875CF4A
        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode "^hd[a-z]"
}
defaults {
                user_friendly_names             yes
}
devices {
       device {
                vendor                          "HITACHI"
                product                         "OPEN-V"
                path_grouping_policy            group_by_node_name
                failback                        immediate
                no_path_retry                   fail
       }
       device {
                vendor                          "IET"
                product                         "VIRTUAL-DISK"
                path_checker                    tur
                path_grouping_policy            failover
                failback                        immediate
                no_path_retry                   fail
       }
}

As an example this is one LUN. It shoes [features=0] so I'd say it should
fail right way

mpath-dc2-a (360060e8004f240000000f24000000502) dm-15 HITACHI,OPEN-V      -SU
[size=26G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=4][active]
 \_ 5:0:1:0     sdu  65:64  [active][ready]
 \_ 5:0:1:16384 sdac 65:192 [active][ready]
 \_ 5:0:1:32768 sdas 66:192 [active][ready]
 \_ 5:0:1:49152 sdba 67:64  [active][ready]
\_ round-robin 0 [prio=4][enabled]
 \_ 3:0:1:0     sdaw 67:0   [active][ready]
 \_ 3:0:1:16384 sdbe 67:128 [active][ready]
 \_ 3:0:1:32768 sdbi 67:192 [active][ready]
 \_ 3:0:1:49152 sdbm 68:0   [active][ready]

It think they fail since I see this messages from LVM:
Apr 14 16:03:05 dc1-x6250-a lvm[15622]: Device failure in
vg_syb_roger-lv_syb_roger_admin
Apr 14 16:03:14 dc1-x6250-a lvm[15622]: Failed to remove faulty devices in
vg_syb_roger-lv_syb_roger_admin

But from some reason LVM cant remove them, any option I should have on
lvm.conf?

BestRegards
Jose
> post your multipath.conf file, you may be queuing forever ?
>
>
>
> On Wed, 2010-04-14 at 15:03 +0000, jose nuno neto wrote:
>> Hi2all
>>
>> I'm on RHEL 5.4 with
>> lvm2-2.02.46-8.el5_4.1
>> 2.6.18-164.2.1.el5
>>
>> I have a multipathed SAN connection with what Im builing LVs
>> Its a Cluster system, and I want LVs to switch on failure
>>
>> If I simulate a fail through the OS via
>> /sys/bus/scsi/devices/$DEVICE/delete
>> I get a LV fail and the service switch to other node
>>
>> But if I do it "real" portdown on the SAN Switch, multipath reports path
>> down, but LVM commands hang forever and nothing gets switched
>>
>> from the logs i see multipath failing paths, and lvm Failed to remove
>> faulty
>> "devices"
>>
>> Any ideas how I should  "fix" it?
>>
>> Apr 14 16:02:45 dc1-x6250-a lvm[15622]: Log device, 253:53, has failed.
>> Apr 14 16:02:45 dc1-x6250-a lvm[15622]: Device failure in
>> vg_ora_scapa-lv_ora_scapa_redo
>> Apr 14 16:02:45 dc1-x6250-a lvm[15622]: Another thread is handling an
>> event.  Waiting...
>>
>> Apr 14 16:02:52 dc1-x6250-a multipathd: mpath-dc1-a: remaining active
>> paths: 0
>> Apr 14 16:02:52 dc1-x6250-a multipathd: mpath-dc1-a: remaining active
>> paths: 0
>> Apr 14 16:02:52 dc1-x6250-a multipathd: mpath-dc1-b: remaining active
>> paths: 0
>> Apr 14 16:02:52 dc1-x6250-a multipathd: mpath-dc1-b: remaining active
>> paths: 0
>>
>> Apr 14 16:03:05 dc1-x6250-a lvm[15622]: Device failure in
>> vg_syb_roger-lv_syb_roger_admin
>> Apr 14 16:03:14 dc1-x6250-a lvm[15622]: Failed to remove faulty devices
>> in
>> vg_syb_roger-lv_syb_roger_admin
>>
>> Much Thanks
>> Jose
>>
>> _______________________________________________
>> linux-lvm mailing list
>> linux-lvm@redhat.com
>> https://www.redhat.com/mailman/listinfo/linux-lvm
>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
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