Oracle RAC startup sequence process owner -- Process ---- log location www.2cto.com $ LOG_HOME = $ GRID_HOME/log/hostname/root ----/etc/init. d/init. ohasd run --- $ LOG_HOME/ohasd. log root ----- orarootagent. bin ------ $ LOG_HOME/agent/ohasd root ---------- crsd. bin grid ------------ oraagent. bin ----------- $ LOG_HOME/agent/crsd grid ------ clusterd asm instance grid ---- tnslsnr (scan listener) grid ----- tnslsnr (node listener) grid ----- $ GRID_HOME/opmn/bin/ons grid ---- enhanced ONS oracle ---------- oraagent. bin ----------- same as oracle --- database instance root ---------- orarootagent. bin network resource scan virtual ip node virtual ip ASM cluster file system Registry GNS grid ----------- diskmon. bin root ---------- octssd. bin grid ---- oraagent. bin ---------------- $ LOG_HOME/agent/ohasd grid ---------- evmd. bin grid ---------- evmlogger. bin grid --------- gipcd. bin grid --------- gpnpd. bin grid --------- mdbsd. bin root ---- cssdmonitor root ---- cssdagent ------------------ $ LOG_HOME/agent/ohasd grid --------- ocssd. bin