[Ocfs2-users] ocfs2 fencing on reboot of 2nd node

[SRuff at fiberlink.com]

I'm performing some testing with ocfs2 on 2 nodes with Red Hat AS4 Update 
4 (x86_64) and (mulitpath included in the 2.6 kernel) and am runing into 
some issues when cleanly rebooting the 2nd node, while the 1st node is 
still up.

So if I do the following on the 2nd node, the 1st node does not fence 
itself:

/etc/init.d/ocfs2 stop
/etc/init.d/o2cb stop
wait more than 60 seconds
init 6

I get the following on the 1st node, but everything is fine:

Sep 21 21:44:49 bbflgrid11 kernel: SCSI error : <0 0 0 12> return code = 
0x20000
Sep 21 21:44:49 bbflgrid11 kernel: end_request: I/O error, dev sdm, sector 
192785
Sep 21 21:44:49 bbflgrid11 kernel: device-mapper: dm-multipath: Failing 
path 8:192.
Sep 21 21:44:49 bbflgrid11 kernel: SCSI error : <0 0 0 14> return code = 
0x20000
Sep 21 21:44:49 bbflgrid11 kernel: end_request: I/O error, dev sdo, sector 
193297
Sep 21 21:44:49 bbflgrid11 kernel: device-mapper: dm-multipath: Failing 
path 8:224.
Sep 21 21:44:49 bbflgrid11 kernel: SCSI error : <0 0 0 13> return code = 
0x20000
Sep 21 21:44:49 bbflgrid11 kernel: end_request: I/O error, dev sdn, sector 
192785
Sep 21 21:44:49 bbflgrid11 kernel: device-mapper: dm-multipath: Failing 
path 8:208.
Sep 21 21:44:49 bbflgrid11 multipathd: 8:192: mark as failed
Sep 21 21:44:49 bbflgrid11 multipathd: mpath1: remaining active paths: 1
Sep 21 21:44:49 bbflgrid11 multipathd: 8:224: mark as failed
Sep 21 21:44:49 bbflgrid11 multipathd: mpath3: remaining active paths: 1
Sep 21 21:44:49 bbflgrid11 multipathd: 8:208: mark as failed
Sep 21 21:44:49 bbflgrid11 multipathd: mpath2: remaining active paths: 1
Sep 21 21:44:58 bbflgrid11 multipathd: 8:192: readsector0 checker reports 
path is up
Sep 21 21:44:58 bbflgrid11 multipathd: 8:192: reinstated
Sep 21 21:44:58 bbflgrid11 multipathd: mpath1: remaining active paths: 2
Sep 21 21:44:58 bbflgrid11 multipathd: 8:208: readsector0 checker reports 
path is up
Sep 21 21:44:58 bbflgrid11 multipathd: 8:208: reinstated
Sep 21 21:44:58 bbflgrid11 multipathd: mpath2: remaining active paths: 2
Sep 21 21:44:58 bbflgrid11 multipathd: 8:224: readsector0 checker reports 
path is up
Sep 21 21:44:58 bbflgrid11 multipathd: 8:224: reinstated
Sep 21 21:44:58 bbflgrid11 multipathd: mpath3: remaining active paths: 2
Sep 21 21:46:06 bbflgrid11 kernel: SCSI error : <1 0 0 11> return code = 
0x20000
Sep 21 21:46:06 bbflgrid11 kernel: end_request: I/O error, dev sdaa, 
sector 1920
Sep 21 21:46:06 bbflgrid11 kernel: device-mapper: dm-multipath: Failing 
path 65:160.
Sep 21 21:46:06 bbflgrid11 multipathd: 65:160: mark as failed
Sep 21 21:46:06 bbflgrid11 multipathd: mpath0: remaining active paths: 1
Sep 21 21:46:06 bbflgrid11 multipathd: 65:160: readsector0 checker reports 
path is up
Sep 21 21:46:06 bbflgrid11 multipathd: 65:160: reinstated
Sep 21 21:46:06 bbflgrid11 multipathd: mpath0: remaining active paths: 2



Now if I do the following on the 2nd node, the 1st node fences itself 
(same as above, except dont wait 60 seconds after o2cb stop)

/etc/init.d/ocfs2 stop
/etc/init.d/o2cb stop
init 6

Node 1 logs the following and fences itself, I have to power cycle the 
server to get it back, it doesn't reboot or shutdown just hangs

Sep 21 21:28:00 bbflgrid11 kernel: SCSI error : <0 0 0 13> return code = 
0x20000
Sep 21 21:28:00 bbflgrid11 kernel: end_request: I/O error, dev sdn, sector 
192785
Sep 21 21:28:00 bbflgrid11 kernel: device-mapper: dm-multipath: Failing 
path 8:208.
Sep 21 21:28:00 bbflgrid11 multipathd: 8:208: mark as failed
Sep 21 21:28:00 bbflgrid11 multipathd: mpath2: remaining active paths: 1
Sep 21 21:28:00 bbflgrid11 kernel: SCSI error : <1 0 0 12> return code = 
0x20000
Sep 21 21:28:00 bbflgrid11 kernel: end_request: I/O error, dev sdab, 
sector 192784
Sep 21 21:28:00 bbflgrid11 kernel: end_request: I/O error, dev sdab, 
sector 192786
Sep 21 21:28:00 bbflgrid11 kernel: device-mapper: dm-multipath: Failing 
path 65:176.
Sep 21 21:28:00 bbflgrid11 kernel: SCSI error : <1 0 0 13> return code = 
0x20000
Sep 21 21:28:00 bbflgrid11 kernel: end_request: I/O error, dev sdac, 
sector 192785
Sep 21 21:28:00 bbflgrid11 kernel: device-mapper: dm-multipath: Failing 
path 65:192.
Sep 21 21:28:00 bbflgrid11 multipathd: 65:176: mark as failed
Sep 21 21:28:00 bbflgrid11 multipathd: mpath1: remaining active paths: 1
Sep 21 21:28:01 bbflgrid11 multipathd: 65:192: mark as failed
Sep 21 21:28:01 bbflgrid11 multipathd: mpath2: remaining active paths: 0
Sep 21 21:28:01 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:01 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:01 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:01 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:01 bbflgrid11 multipathd: 65:176: readsector0 checker reports 
path is up
Sep 21 21:28:01 bbflgrid11 multipathd: 65:176: reinstated
Sep 21 21:28:01 bbflgrid11 multipathd: mpath1: remaining active paths: 2
Sep 21 21:28:03 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:03 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:03 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:03 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:05 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:05 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:05 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:05 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:07 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:07 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:07 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:07 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:09 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:09 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:09 bbflgrid11 kernel: (4912,1):o2hb_bio_end_io:331 ERROR: IO 
Error -5
Sep 21 21:28:09 bbflgrid11 kernel: (4912,1):o2hb_do_disk_heartbeat:973 
ERROR: status = -5
Sep 21 21:28:09 bbflgrid11 multipathd: 8:208: readsector0 checker reports 
path is up
Sep 21 21:28:09 bbflgrid11 multipathd: 8:208: reinstated
Sep 21 21:28:09 bbflgrid11 multipathd: mpath2: remaining active paths: 1
Sep 21 21:28:10 bbflgrid11 multipathd: 65:192: readsector0 checker reports 
path is up
Sep 21 21:28:10 bbflgrid11 multipathd: 65:192: reinstated
Sep 21 21:28:10 bbflgrid11 multipathd: mpath2: remaining active paths: 2


...
Index 14: took 0 ms to do submit_bio for read
Index 15: took 0 ms to do waiting for read completion
(11,1):o2hb_stop_all_regions:1908 ERROR: stopping heartbeat on all active 
regions
Kernel panic - not syncing:  ocfs2 is very sorry to be fencing this system 
by panicing


Seems like if I wait for the node 1 to heartbeat to node 2, with o2c down, 
before rebooting it's fine, but if I reboot before node 1 has had a chance 
to hearbeat to node 2, with o2cb down, it's panics.



Shawn E. Ruff
Senior Oracle DBA
Fiberlink Communications

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