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 <TITLE>buffer cache/chunk cache</TITLE> 
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 <H1>buffer cache/chunk cache</H1> 
 <P><UL>
<LI><H2>XFS uses two levels of buffer cache:
</H2>
<UL>
<LI> standard bufs (dev/block #) limited to 16K or 64K depending on page size. (can be pinned).
<LI> Buffers physically point to VM pages
<LI> standard bufs are used for meta data I/O.
<LI> chunk cache clusters buffers (user data):
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<LI>collection of standard bufs (logically contiguous) per file
<LI>not always associated with disk blocks (delayed allocate)
<LI>supports large pages (16k, 64k, 256k, 1m, 4m, 16m)
<LI>chunk cache buffers searched by file offset</UL></UL></UL></P>
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