Hi,all >looks like a failure in sysfs support code in the scsi module. might be worth posting to the LKML. But after I use dmsetup to remove the dm device, and "rmmod" the kernel module "dm_round_robin" and "dm_multipath"， the kernel works fine as I pull out one HBA card for about 1 minutes and plug in it again. the messages are: Dec 23 18:26:30 nd03 kernel: qla2300 0000:07:01.1: LOOP DOWN detected (2). Dec 23 18:27:05 nd03 kernel: rport-1:0-1: blocked FC remote port time out: removing target Dec 23 18:27:05 nd03 kernel: Synchronizing SCSI cache for disk sdb: Dec 23 18:27:05 nd03 kernel: FAILED Dec 23 18:27:05 nd03 kernel: status = 0, message = 00, host = 1, driver = 00 Dec 23 18:27:05 nd03 udev[3991]: udev_db.c: unable to read db file '/dev/.udevdb/block@sdb@sdb1' Dec 23 18:27:05 nd03 udev[3991]: udev_remove.c: 'sdb1' not found in database, falling back on default name Dec 23 18:27:05 nd03 udev[3991]: udev_remove.c: removing device node '/dev/sdb1' Dec 23 18:27:05 nd03 udev[3989]: udev_db.c: unable to read db file '/dev/.udevdb/class@scsi_generic@sg1' Dec 23 18:27:05 nd03 udev[3989]: udev_remove.c: 'sg1' not found in database, falling back on default name Dec 23 18:27:05 nd03 udev[3989]: udev_remove.c: removing device node '/dev/sg1' Dec 23 18:27:05 nd03 udev[4026]: udev_db.c: unable to read db file '/dev/.udevdb/block@sdb' Dec 23 18:27:05 nd03 udev[4026]: udev_remove.c: 'sdb' not found in database, falling back on default name Dec 23 18:27:05 nd03 udev[4026]: udev_remove.c: removing device node '/dev/sdb' Dec 23 18:27:49 nd03 kernel: <6>qla2300 0000:07:01.1: LIP reset occured (f8f7). Dec 23 18:27:51 nd03 kernel: qla2300 0000:07:01.1: LIP occured (f8f7). Dec 23 18:27:51 nd03 kernel: qla2300 0000:07:01.1: LOOP UP detected (2 Gbps). Dec 23 18:27:52 nd03 kernel: Vendor: TOYOU Model: NetStor DA9220F Rev: 342R Dec 23 18:27:52 nd03 kernel: Type: Direct-Access ANSI SCSI revision: 03 Dec 23 18:27:52 nd03 kernel: SCSI device sdb: 999950336 512-byte hdwr sectors (511975 MB) Dec 23 18:27:52 nd03 kernel: SCSI device sdb: drive cache: write back Dec 23 18:27:52 nd03 kernel: SCSI device sdb: 999950336 512-byte hdwr sectors (511975 MB) Dec 23 18:27:52 nd03 kernel: SCSI device sdb: drive cache: write back Dec 23 18:27:52 nd03 kernel: sdb: sdb1 Dec 23 18:27:52 nd03 kernel: Attached scsi disk sdb at scsi1, channel 0, id 0, lun 0 Dec 23 18:27:52 nd03 kernel: Attached scsi generic sg1 at scsi1, channel 0, id 0, lun 0, type 0 Dec 23 18:27:52 nd03 scsi.agent[4049]: disk at /devices/pci0000:00/0000:00:02.0/0000:05:1d.0/0000:07:01.1/host1/rport-1:0-1/t arget1:0:0/1:0:0:0 Dec 23 18:27:52 nd03 udev[4059]: udev_rules.c: no rule found, use kernel name 'sdb' Dec 23 18:27:52 nd03 udev[4059]: udev_add.c: creating device node '/dev/sdb' Dec 23 18:27:52 nd03 udev[4060]: udev_rules.c: no rule found, use kernel name 'sg1' Dec 23 18:27:52 nd03 udev[4060]: udev_add.c: creating device node '/dev/sg1' Dec 23 18:27:53 nd03 udev[4082]: udev_rules.c: no rule found, use kernel name 'sdb1' Dec 23 18:27:53 nd03 udev[4082]: udev_add.c: creating device node '/dev/sdb1' In summary: kernel with module dm_multipath loaded: When I plug in the HBA card, the kernel finds a new device named "/dev/sdc" which is "/dev/sdb" orginally, and then kernel painc. kernel without module dm_multipath loaded: When I plug in the HBA card, the kernel finds a new device named as the old one "/dev/sdb", and all works fine. What's the matter? where would be the bug ? Best regards! Luckey -- dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
