I was recently applying the July PSU to one of my RAC databases and I kept getting an error from OPatch that the prereq checkSystemSpace failed. It should be no surprise to anyone out there that OPatch goes through a number of pre-requisite checks before applying the patch. OPatch is trying to ensure a good chance of success and not bomb out mid-way through the patch process.
Now checkSystemSpace is just one of the checks OPatch performs. And from its title, I can easily discern that I am short on space, probably disk space. I know this is on the disk mount where ORACLE_HOME resides as that is the only disk space I am modifying when applying the patch. But what OPatch was not telling me on the screen is how much space was needed. The OPatch log file did not tell me either. I had about 8GB of free space on that drive and the PSU was nowhere near that size. I did clean up some old files but OPatch still failed on this check.
To find out how much disk space was needed, I manually ran OPatch for this specific prerequisite check as follows:
opatch prereq checkSystemSpace -ph .
I am running a prerequisite check. The second parameter to OPatch tells it which check to run. The -ph directive tells OPatch which patch home directory to use and in my case, it is the current directory (denoted by the period). The output was similar to the following trimmed for brevity:
Space Needed : 8780.128MB
Space Usable : 8347.293MB
Required amount of space(8780.128MB) is not available.
Prereq "checkSystemSpace" failed.
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OPatch has a number of other checks with it. To find out all of them, issue the following:
opatch prereq -h
This will not only give the names of the checks, but a short description of each. For example, you might be notified that the check CheckApplicable has failed. What does that mean? The one paragraph description is:
CheckApplicable
Check for the presence of the required components in
the ORACLE_HOME and check if all the actions of the
given patch(es) are applicable.
So this check is ensuring that the Oracle home directory has the components needed to succeed. For example, you can’t apply a patch to fix a partitioning problem if the Partitioning option is not installed. Use OPatch to see the rest of the rereq checks OPatch is doing. Most of them go on in the background without notice so some of these might surprise you.
Next time you have a prereq check fail, try to run it manually to see if you have more information than what was initially provided when you tried to apply the patch.
