Rename Disk Heartbeat Timeout Parameter

Wengang ( wen.gang.wang@oracle.com ) Aug. 8, 2007

Goals

• ocfs2 offers a way to set a heartbeat timeout, one can set value for O2CB_HEARTBEAT_THRESHOLD to do that. but the value for the parameter is ((Heartbeat timeout in secs)/2+1), it's a indirect value and not friendly to users. By this small project, we will offer users a new way to set the timeout instead of the old way.

TODOs

configuration file

• new parameter O2CB_HEARTBEAT_TIMEOUT_MS is introduced. It's the it's the heartbeat timeout in milli-seconds with default value 60000.
• the old parameter O2CB_HEARTBEAT_THRESHOLD is obsolete.
• old configuration file with O2CB_HEARTBEAT_THRESHOLD parameter is supported. while, it will be converted to the new format when used.

/etc/init.d/o2cb

• when detect that O2CB_HEARTBEAT_THRESHOLD exits in configuration file do the 3 action below:

• 1. convert value for O2CB_HEARTBEAT_THRESHOLD to value for O2CB_HEARTBEAT_TIMEOUT_MS (newvalue=(oldvalue-1)*2000).

  2. remove O2CB_HEARTBEAT_THRESHOLD from configuration file.
  3. add O2CB_HEARTBEAT_TIMEOUT_MS into configuration file.
• set value for the new O2CB_HEARTBEAT_TIMEOUT_MS instead of the old one into kernel.

kernel module

• change proc entry /proc/../hb_dead_threshold to /proc/../hb_timeout_ms

• remove o2hb_dead_threshold variable which is used to store the "THRESHOLD" value.
• add o2hb_dead_timeout_ms to store the "TIMEOUT_MS" value.
• for places where "THRESHOLD" value is used, use ("TIMEOUT_MS"/2000 +1) instead.

Over