[Ocfs2-users] Health check file hc_ORACLESID.dat

[Silviu Marin-Caea]

About FAQ 49, specifically, this paragraph:
"Also as OCFS2 does not currently support shared writeable mmap, the health 
check (GIMH) file $ORACLE_HOME/dbs/hc_ORACLESID.dat and the ASM file 
$ASM_HOME/dbs/ab_ORACLESID.dat should be symlinked to local filesystem. We 
expect to support shared writeable mmap in the OCFS2 1.4 release."


In $ORACLE_HOME/dbs there are three hc_ files.  Assuming the ORACLE_SID is 
prod for the RAC and prod1, prod2 for each node respectively, we have three 
files named:
hc_prod.dat
hc_prod1.dat
hc_prod2.dat


It's clear what to do with hc_prod1.dat and hc_prod2.dat, but what about 
hc_prod.dat?  Do I leave in the shared home?




A little additional info on hc_ files:

"Q1: What is the $ORACLE_HOME/dbs/hc_<ORACLE_SID>.dat file?
A1: The $ORACLE_HOME/dbs/hc_<ORACLE_SID>.dat is created for the instance 
health check monitoring.  It contains information used to monitor the 
instance health and to determine why it went down if the instance isn't up. 
The file will be recreated at every instance startup.

Q2: What happens if the $ORACLE_HOME/dbs/hc_<ORACLE_SID>.dat file is deleted?
A2: Per Bug 4645405 UNABLE TO START DB - ORA-7445 [KSIHSMRINI()+152] [SIGBUS], 
if you replace the file with an empty "dummy" copy, you will get an ORA-7445 
error.  Therefore, if the file gets deleted on the fly while the database is 
up, or if the file is replaced with a 0 byte file, simply delete the file and 
restart the database.  The file will be correctly recreated at the next 
database startup."