Description of problem: all minutes I have I/O error due to path failed like this : kernel: SCSI error : <2 0 1 0> return code = 0x6000000 Aug 13 15:22:03 PX1920PRD001 kernel: end_request: I/O error, dev sdh, sector 147415768 Aug 13 15:22:03 PX1920PRD001 kernel: device-mapper: dm-multipath: Failing path 8:112. Aug 13 15:22:03 PX1920PRD001 kernel: end_request: I/O error, dev sdh, sector 147415776 Aug 13 15:22:03 PX1920PRD001 multipathd: 8:112: mark as failed Aug 13 15:22:03 PX1920PRD001 multipathd: mpath1: remaining active paths: 3 Aug 13 15:22:33 PX1920PRD001 multipathd: 8:112: tur checker reports path is up Aug 13 15:22:33 PX1920PRD001 multipathd: 8:112: reinstated Aug 13 15:22:33 PX1920PRD001 multipathd: mpath1: remaining active paths: 4 all loop of san is OK no error on switch and baie. application is slow due to I/O error. /etc/multipath.conf devnode_blacklist { devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*" devnode "^(hd|xvd|vd)[a-z]*" wwid 3600508e000000000715541cadb3ff004 } ## Use user friendly names, instead of using WWIDs as names. defaults { polling_interval 30 failback immediate no_path_retry 10 rr_min_io 100 path_checker tur user_friendly_names yes } devices { device { vendor "IBM" product "2145" path_grouping_policy group_by_prio prio_callout "/sbin/mpath_prio_alua /dev/%n" features "0" } } Version-Release number of selected component (if applicable): rhel 4.7 device-mapper-1.02.28-2.el4 device-mapper-1.02.28-2.el4 device-mapper-multipath-0.4.5-35.el4 Emulex LightPulse Fibre Channel SCSI driver 8.0.16.46 Firmware 2.01A9 (U2F2.01A9) Baie storwize V7000 SVC 6.4 How reproducible: start server and look /var/log/messages Steps to Reproduce: 1. 2. 3. Actual results: kernel: SCSI error : <2 0 1 0> return code = 0x6000000 Aug 13 15:22:03 PX1920PRD001 kernel: end_request: I/O error, dev sdh, sector 147415768 Aug 13 15:22:03 PX1920PRD001 kernel: device-mapper: dm-multipath: Failing path 8:112. Aug 13 15:22:03 PX1920PRD001 kernel: end_request: I/O error, dev sdh, sector 147415776 Aug 13 15:22:03 PX1920PRD001 multipathd: 8:112: mark as failed Aug 13 15:22:03 PX1920PRD001 multipathd: mpath1: remaining active paths: 3 Aug 13 15:22:33 PX1920PRD001 multipathd: 8:112: tur checker reports path is up Aug 13 15:22:33 PX1920PRD001 multipathd: 8:112: reinstated Aug 13 15:22:33 PX1920PRD001 multipathd: mpath1: remaining active paths: 4 Expected results: Additional info: I try to fix features=0 in /etc/multipath.conf but doesn't work. ([features="1 queue_if_no_path"]) I have also try to fix it with dmsetup message mpath1 0 "fail_if_no_path" ([features="0"]) but after 5 minutes it roll back to [features="1 queue_if_no_path"]
Isn't this just a duplicate of Bug #996628?