[dm-devel] Failed path will not be recovered when disabling/enabling remote port
Christian May
cmay at linux.vnet.ibm.com
Thu Jul 2 11:27:11 UTC 2009
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 at 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 at 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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