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Re: [dm-devel] Failed path will not be recovered when disabling/enabling remote port



One simple question. Did you observe if multipathd is (still) running ?
(when the port was enabled)

On Thu, 2009-07-02 at 13:27 +0200, Christian May wrote:
> Hi,
> 
> I've setup an IBM z10 LPAR (mainframe server) with 2.6.30-kernel. 
> Attached to the System z10 was an IBM DS8000 storage server. 10x SCSI 
> LUNs were assigned to LPAR via two pathes:
> 
> Example:
> 36005076303ffc1040000000000001269 dm-9 IBM,2107900
> size=1.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=-2 status=active
>   |- 0:0:0:1080639506 sdw   65:96  active undef running
>   `- 1:0:1:1080639506 sdt   65:48  active undef running
> 
> Special parameter setting: dev_loss_tmo=90sec; fast_io_fail_tmo=5sec
> 
> multipath tools: multipath-tools v0.4.9 (04/04, 2009)
> device-mapper: device-mapper-1.02.27-7.fc10.s390x, 
> device-mapper-libs-1.02.27-7.fc10.s390x
> 
> When removing a remote port (disabling a port on the BROCADE FC switch) 
> one path failed.
> 
> root h42lp26/ESAME:~]
>  > multipath -l
> 36005076303ffc1040000000000001268 dm-8 ,
> size=1.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=-2 status=active
>   |- #:#:#:#          -     #:#   failed undef running
>   `- 1:0:1:1080573970 sdr   65:16 active undef running
> 
> After a while (>90sec) SCSI LUNs were removed from system:
> 
> 
> UEVENT[1246531815.619428] add      /kernel/uids/74 (uids)
> UDEV  [1246531815.621708] add      /kernel/uids/74 (uids)
> UEVENT[1246531816.725299] remove   /kernel/uids/74 (uids)
> UDEV  [1246531816.726151] remove   /kernel/uids/74 (uids)
> UEVENT[1246531929.959709] change   /devices/virtual/block/dm-0 (block)
> UEVENT[1246531929.959749] change   /devices/virtual/block/dm-3 (block)
> UEVENT[1246531929.959759] change   /devices/virtual/block/dm-4 (block)
> UEVENT[1246531929.959769] change   /devices/virtual/block/dm-5 (block)
> UEVENT[1246531929.966647] change   /devices/virtual/block/dm-7 (block)
> UDEV  [1246531930.045444] change   /devices/virtual/block/dm-4 (block)
> UDEV  [1246531930.048923] change   /devices/virtual/block/dm-7 (block)
> UDEV  [1246531930.054614] change   /devices/virtual/block/dm-0 (block)
> UDEV  [1246531930.060091] change   /devices/virtual/block/dm-3 (block)
> UDEV  [1246531930.071744] change   /devices/virtual/block/dm-5 (block)
> UEVENT[1246531949.278541] change   /devices/virtual/block/dm-9 (block)
> UDEV  [1246531949.369690] change   /devices/virtual/block/dm-9 (block)
> UEVENT[1246531950.295756] change   /devices/virtual/block/dm-8 (block)
> UEVENT[1246531950.297597] change   /devices/virtual/block/dm-6 (block)
> UEVENT[1246531950.297610] change   /devices/virtual/block/dm-2 (block)
> UEVENT[1246531950.297620] change   /devices/virtual/block/dm-1 (block)
> UDEV  [1246531950.430097] change   /devices/virtual/block/dm-8 (block)
> UDEV  [1246531950.588626] change   /devices/virtual/block/dm-2 (block)
> UDEV  [1246531950.632482] change   /devices/virtual/block/dm-1 (block)
> UDEV  [1246531950.634515] change   /devices/virtual/block/dm-6 (block)
> UEVENT[1246532034.277177] remove   
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362/scsi_generic/sg0 
> (scsi_generic)
> UEVENT[1246532034.277214] remove   
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362/scsi_device/0:0:0:1080377362 
> (scsi_device)
> UEVENT[1246532034.277226] remove   
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362/scsi_disk/0:0:0:1080377362 
> (scsi_disk)
> UEVENT[1246532034.277236] remove   /devices/virtual/bdi/8:0 (bdi)
> UEVENT[1246532034.277247] remove   
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362/block/sda 
> (block)
> UEVENT[1246532034.277258] remove   
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362 
> (scsi)
> UEVENT[1246532034.277384] remove   
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080836114/scsi_generic/sg2 
> (scsi_generic)
> UEVENT[1246532034.277594] remove   
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080836114/scsi_device/0:0:0:1080836114 
> (scsi_device)
> UEVENT[1246532034.277864] remove   
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080836114/scsi_disk/0:0:0:1080836114 
> (scsi_disk)
> UEVENT[1246532034.278035] remove   /devices/virtual/bdi/8:32 (bdi)...
> 
> ....
> 
> When re-enabling the path, SCSI LUNS were reassigned to system but path 
> didn't recover:
> 
> UEVENT[1246532107.387169] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080836114 
> (scsi)
>   UEVENT[1246532107.387209] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080836114/scsi_device/0:0:0:1080836114 
> (scsi_device)
>   UEVENT[1246532107.387220] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080836114/scsi_generic/sg0 
> (scsi_generic)
>   UEVENT[1246532107.387230] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080836114/scsi_disk/0:0:0:1080836114 
> (scsi_disk)
>   UEVENT[1246532107.388941] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362 
> (scsi)
>   UEVENT[1246532107.388952] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362/scsi_device/0:0:0:1080377362 
> (scsi_device)
>   UEVENT[1246532107.388963] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362/scsi_generic/sg2 
> (scsi_generic)
>   UEVENT[1246532107.397111] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080836114/block/sdu 
> (block)
>   UEVENT[1246532107.399249] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080639506 
> (scsi)
>   UEVENT[1246532107.399261] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080639506/scsi_device/0:0:0:1080639506 
> (scsi_device)
>   UEVENT[1246532107.399272] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080639506/scsi_generic/sg4 
> (scsi_generic)
>   UEVENT[1246532107.399711] add      /devices/virtual/bdi/65:64 (bdi)
>   UEVENT[1246532107.399722] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362/scsi_disk/0:0:0:1080377362 
> (scsi_disk)
>   UEVENT[1246532107.401605] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080573970 
> (scsi)
>   UEVENT[1246532107.401617] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080573970/scsi_device/0:0:0:1080573970 
> (scsi_device)
>   UEVENT[1246532107.401628] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080573970/scsi_generic/sg6 
> (scsi_generic)
>   UEVENT[1246532107.403731] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080967186 
> (scsi)
>   UEVENT[1246532107.403742] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080967186/scsi_device/0:0:0:1080967186 
> (scsi_device)
>   UEVENT[1246532107.403753] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080967186/scsi_generic/sg8 
> (scsi_generic)
>   UEVENT[1246532107.405963] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080377362/block/sdv 
> (block)
>   UEVENT[1246532107.406168] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080901650 
> (scsi)
>   UEVENT[1246532107.407608] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080901650/scsi_device/0:0:0:1080901650 
> (scsi_device)
>   UEVENT[1246532107.407624] add      
> /devices/css0/0.0.0330/0.0.1780/host0/rport-0:0-0/target0:0:0/0:0:0:1080901650/scsi_generic/sg10 
> (scsi_generic)
>   UEVENT[1246532107.407880] add      /devices/virtual/bdi/65:80 (bdi)
> 
> 
> [root h42lp26/ESAME:~]
>  > multipath -l
> 36005076303ffc1040000000000001268 dm-8 ,
> size=1.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=-2 status=active
>   |- #:#:#:#          -     #:#    failed undef running
>   `- 1:0:1:1080573970 sdr   65:16  active undef running
> 
> 
> Running "multipath" command will recover the failed path but that's not 
> way it should be...can somebody help to fix this? Why is the path not 
> recovered automatically?
> 
> 
> Regards,
> 
> 
> Christian May
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> --
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