HP UX syslog "Rebooting for cluster integrity" powerpath

安裝Oracle RAC 之前, 如果沒先處理好powerpath 等等的multi-path 軟體問題,

可能在dbca 之後一小時內會發生node reboot情形

以下連結供參考Ref:

https://forums.oracle.com/thread/927929

https://forums.oracle.com/thread/993066

https://forums.oracle.com/thread/581397

最後查到這篇才證實了我的猜測

==> 294430.1

LONG LATENCIES TO THE VOTING DISKS : EMC PowerPath path error detection and I/O repost and redirect greater than default misscount 

The most common problems relate to multi-path IO software drivers, and the reconfiguration times resulting from a failure in the IO path.

Hardware and (re)configuration issues that introduce these latencies should be corrected.

Reboot原因說明如下

Disk LUN 在I/O重新導向的狀況下...只要符合以下任一條件, 就會node reboot

Takes more than Disktimeout seconds (200 sec) or

Takes more than Misscount Seconds (30 sec)

* By default Misscount is less than Disktimeout seconds

只有在網路互ping超過misscount或Voting disk超過disktimeout時機器才會reboot.

misscount :   Default Value is 60 Sec (Linux) and 30 Sec in Unix platform

disktimeout : Default Value is 200. (Disk IO)