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 <TITLE>DMF Reliability Features</TITLE> 
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 <H1>DMF Reliability Features</H1> 
 <P><UL>
<LI><H2>File system backup always required
</H2>
<UL>
<LI>DMF interoperates with xfsdump/xfsrestore
<LI>Can minimize dump time - just transfers inodes/directories
</UL></UL><UL>
<LI><H2>Issue:  metadata in three places
</H2>
<UL>
<LI>Inodes, DMF database, MSP database
</UL></UL><UL>
<LI><H2>All database transactions are journaled
</H2>
<UL>
<LI>Replay journals after unscheduled interrupt
<LI>New database uses two-phase commit
</UL></UL><UL>
<LI><H2>Comprehensive auditing utility for DMF databases
</H2>
<UL>
<LI>dmaudit, dmatvfy, dmdbcheck (new at DMF 2.5)
</UL></UL><UL>
<LI><H2>Ability to create multiple copies of migrated data
</H2>
<UL>
<LI>Disaster recovery and backup
</UL></UL><UL>
<LI><H2>Media integrity checking and recovery</H2>
</UL></P>
<P></P> 
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