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 <TITLE>How Does IRIX DMF Work?</TITLE> 
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 <H1>How Does IRIX DMF Work?</H1> 
 <P><UL>
<LI><H2>Migration steps:
</H2>
<UL>
1) user process issues read
<BR><BR>2) XFS notices file is offline
<BR>3) Process sleeps
<BR>4) DMF sends recall request via DMAPI 
<BR>5) DMF determines residence
<BR>6) DMF sends request to MSP
<BR>7) MSP restores data
<BR>8) MSP responds to DMF daemon
<BR>9) DMF responds to kernel
<BR>10) Kernel wakes process
</UL></UL><UL>
<LI><H2>Considerations:
</H2>
<UL>
<LI>unscheduled interrupts
<LI>multiple requests
<LI>atomic database references</UL></UL></P>
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