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



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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