We upgraded the disk controller driver to the latest version. I ran these 3 steps:
1. DBCC CHECKDB reported errors.
2. REPAIR_REBUILD fixed the database, no errors reported.
3. DBCC CHECKDB reporting errors again.
and now dbcc checkdb shows no error messages. Also ran DBCC Checkalloc successfully. Many thanks
see [this post][1] for the complete thread
[1]: http://dba.stackexchange.com/questions/12996/msg-2534-dbcc-checkdb-allocation-errors
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