DBC:Errors/DBC-E004
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[DBC-E004] OS error retrieving <file>: <message>
This happens if DBcollect cannot read a file as part of the collected data.
A common cause is when the file is a virtual file which cannot be read by the OS.
Solution: It is not a critical problem, DBCollect will proceed with the rest of the tasks.
Solution 2: dbcollect runs as non-root (see Security) and cannot read the SAR files. If the file is a SAR file: /var/log/sa/saXX, you can provide read access to others for these files:
chmod o+r /var/log/sa/sa*