233 lines
3.8 KiB
HTML
233 lines
3.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>File Systems</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="The openMosix HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="the openMosix FAQ"
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HREF="openmosixfaq.html"><LINK
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REL="PREVIOUS"
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TITLE="Kernel Questions"
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HREF="x1608.html"><LINK
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REL="NEXT"
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TITLE="Programming openMosix"
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HREF="x1661.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>The openMosix HOWTO: </TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="x1608.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 19. the openMosix FAQ</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="x1661.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="AEN1638"
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></A
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>19.4. File Systems</H1
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><DIV
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CLASS="QANDASET"
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><DL
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><DT
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>19.4.1. <A
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HREF="x1638.html#AEN1642"
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> What's oMFS, how do I use, and where do I get it?:</A
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></DT
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><DT
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>19.4.2. <A
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HREF="x1638.html#AEN1657"
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> Can somebody explain to me the difference bewteen MFS and DFSA, and why I would need DFSA?:</A
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></DT
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></DL
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><DIV
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CLASS="QANDAENTRY"
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><DIV
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CLASS="QUESTION"
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><P
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><A
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NAME="AEN1642"
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></A
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><B
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>19.4.1. </B
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>
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What's oMFS, how do I use, and where do I get it?:</P
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></DIV
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><DIV
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CLASS="ANSWER"
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><P
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><B
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> </B
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>
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The openMosix File System (oMFS) is the filesystem used by openMosix kernels. You get it by installing an openMosix kernel
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on the nodes of your cluster with oMFS enabled in the kernel-config. (It should be enabled in the openMosix RPMs by
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default.)</P
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><P
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> You should also enable Direct Filesystem Access (DFSA) which allows a migrated process to execute many syscalls on the
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remote node locally without the need to migrate it back to its home node.</P
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><P
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> The use and administration of oMFS is very similar to NFS, but unlike NFS, oMFS features:
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<P
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></P
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><UL
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><LI
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><P
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> Cache consistency</P
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></LI
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><LI
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><P
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> Timestamp consistency</P
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></LI
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><LI
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><P
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> Link consistency</P
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></LI
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></UL
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>
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The DFSA layer on top of oMFS makes sure to move the process to the data, instead of vice versa, whenever it makes sense.</P
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><P
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> Please read more about oMFS and how to use it in earlier chapters of the HOWTO.
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</P
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></DIV
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></DIV
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><DIV
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CLASS="QANDAENTRY"
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><DIV
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CLASS="QUESTION"
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><P
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><A
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NAME="AEN1657"
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></A
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><B
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>19.4.2. </B
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>
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Can somebody explain to me the difference bewteen MFS and DFSA, and why I would need DFSA?:</P
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></DIV
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><DIV
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CLASS="ANSWER"
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><P
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><B
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> </B
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>
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DFSA stands for Direct File System Access and is an optimization. It allows remote proccesses to perform some file system
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system calls locally rather then sending them to their home node. MFS stands for Mosix File System and allows all nodes
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access to all node filesystems. DFSA runs on top of a cluster filesystem, in this case MFS.</P
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></DIV
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></DIV
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="x1608.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="x1661.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Kernel Questions</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="openmosixfaq.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
|
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VALIGN="top"
|
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>Programming openMosix</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |