Storage pool problems might include the following:
- Unexpected events. Many problems described here are often side
effects of various infrequent or uncommon events. Such events include network
failures, system crashes, failed or aborted cleanup operations, operating
system bugs, disk failure, network reconfiguration events, and so on. Another
class of events includes accidental or malicious delete, move, rename, or
change-protection operations on containers. These are all varieties of unexpected
events.
- Major and minor problems. The summary output from checkvob records
the number of major and minor problems detected. Bad pool roots and missing
data containers (source or DO pools) are considered major problems. All others
are considered minor.
- Reference times. A pool or VOB database’s reference time is the
point at which VOB activity was last recorded there. This can be the current
time, the time when an operational VOB was locked, or the time
when a snapshot or backup operation captured the pool or database. Expected
output and fix processing from checkvob varies markedly
depending on the relative reference times on the VOB database and storage
pools being compared. There are three general cases:
- The database is newer than the pools.
- The pools are newer than the database.
- The database and storage pools are synchronized: they are both current,
or they were retrieved as a unit from a complete backup of the VOB storage
directory.