Sunday, November 17, 2013

Disktimeout/Misscount/reboottime for CSS in Oracle RAC

    1) Disktimeout:
   
    Disk Latencies in seconds from node-to-Votedisk. Default Value is 200. (Disk IO)
    $crsctl get css disktimeout

    2) Misscount:
   
    Network Latencies in second from node-to-node (Interconnect).
    Default Value is 60 Sec (Linux) and 30 Sec in Unix platform. (Network IO)
    Misscount < Disktimeout

    $crsctl get css misscount

    3) RebootTime :

    (default 3 seconds) -the amount of time allowed for a node to complete a reboot
    after the CSS daemon has been evicted.
    crsctl get css reboottime

    4) To Edit these values of Disktimeout/Misscount/reboottime
  
    1. shut down CRS on all nodes but one as root run crsctl on that remaining node
    2. $CRS_HOME/bin/crsctl set css misscount <n> [-force] (<n> is seconds)
    3. $CRS_HOME/bin/crsctl set css reboottime <r> [-force](<r> is seconds)
    4. $CRS_HOME/bin/crsctl set css disktimeout <d> [-force](<d> is seconds)
    5. reboot the remaining node (the node where you just made the change

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