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 <TITLE>async log and transactions</TITLE> 
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 <H1>async log and transactions</H1> 
 <P><UL>
<LI><H2>XFS log has two parts:
</H2>
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<LI> in-core log buffers (from 2 to 8)
<LI> on-disk log (always written, never read)
<LI> on-disk log is circular buffer (cycle/block no).
</UL></UL><UL>
<LI><H2>recovery reads on-disk log and replays, if needed
</H2>
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<LI>mount calls recovery code
<LI>unmount prevents replay
<LI>head/tail of log determined using cycle/block no.</UL></UL></P>
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