[Ocfs2-users] 6 node cluster with unexplained reboots

[Ulf Zimmermann]

We just installed a new cluster with 6 HP DL380g5, dual single port Qlogic 24xx HBAs connected via two HP 4/16 Storageworks switches to a 3Par S400. We are using the 3Par recommended config for the Qlogic driver and device-mapper-multipath giving us 4 paths to the SAN. We do see some SCSI errors where DM-MP is failing a path after get a 0x2000 error from the SAN controller, but the path gets puts back in service in less then 10 seconds.

This needs to be fixed but I don't think it is what is causing our reboots. 2 of the nodes rebooted once while being idle (ocfs2 and clusterware were running, no db) and one node rebooted while idle (another node was copying using fscat our 9i db from ocfs1 to the ocfs2 data volume) and once while some load was put on it via the upgraded 10g database. In all cases it is as if someone a hardware reset button. No kernel panic (at least not one leading to a stop with visable message), we can get a dirty write cache for the internal cciss controller. 

The only messages we get on the nodes are when the crashed node is already in reset and it missed its ocfs2 heartbeat (set to the default of 7), followed later by crs moving the vip.

Any hints on trouble shooting this would be appreciated.

Regards, Ulf.


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