Changeset 752 for trunk/server/docs/htmldocs/Samba3-HOWTO/SambaHA.html
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docs/htmldocs/Samba3-HOWTO/SambaHA.html (modified) (13 diffs)
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r745 r752 1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 32. High Availability</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="The Official Samba 3.5.x HOWTO and Reference Guide"><link rel="up" href="optional.html" title="Part III. Advanced Configuration"><link rel="prev" href="Backup.html" title="Chapter 31. Backup Techniques"><link rel="next" href="largefile.html" title="Chapter 33. Handling Large Directories"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 32. High Availability</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="Backup.html">Prev</a> </td><th width="60%" align="center">Part III. Advanced Configuration</th><td width="20%" align="right"> <a accesskey="n" href="largefile.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 32. High Availability"><div class="titlepage"><div><div><h2 class="title"><a name="SambaHA"></a>Chapter 32. High Availability</h2></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="othername">H.</span> <span class="surname">Terpstra</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:jht@samba.org">jht@samba.org</a>></code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Jeremy</span> <span class="surname">Allison</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:jra@samba.org">jra@samba.org</a>></code></p></div></div></div></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="SambaHA.html#id434489">Features and Benefits</a></span></dt><dt><span class="sect1"><a href="SambaHA.html#id434596">Technical Discussion</a></span></dt><dd><dl><dt><span class="sect2"><a href="SambaHA.html#id434627">The Ultimate Goal</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id4347 50">Why Is This So Hard?</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id435417">A Simple Solution</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id435490">High-Availability Server Products</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id435619">MS-DFS: The Poor Man's Cluster</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id435652">Conclusions</a></span></dt></dl></dd></dl></div><div class="sect1" title="Features and Benefits"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id434489"></a>Features and Benefits</h2></div></div></div><p>1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 32. High Availability</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="The Official Samba 3.5.x HOWTO and Reference Guide"><link rel="up" href="optional.html" title="Part III. Advanced Configuration"><link rel="prev" href="Backup.html" title="Chapter 31. Backup Techniques"><link rel="next" href="largefile.html" title="Chapter 33. Handling Large Directories"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 32. High Availability</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="Backup.html">Prev</a> </td><th width="60%" align="center">Part III. Advanced Configuration</th><td width="20%" align="right"> <a accesskey="n" href="largefile.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 32. High Availability"><div class="titlepage"><div><div><h2 class="title"><a name="SambaHA"></a>Chapter 32. High Availability</h2></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="othername">H.</span> <span class="surname">Terpstra</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:jht@samba.org">jht@samba.org</a>></code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Jeremy</span> <span class="surname">Allison</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:jra@samba.org">jra@samba.org</a>></code></p></div></div></div></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="SambaHA.html#id434489">Features and Benefits</a></span></dt><dt><span class="sect1"><a href="SambaHA.html#id434596">Technical Discussion</a></span></dt><dd><dl><dt><span class="sect2"><a href="SambaHA.html#id434627">The Ultimate Goal</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id434749">Why Is This So Hard?</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id435417">A Simple Solution</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id435490">High-Availability Server Products</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id435618">MS-DFS: The Poor Man's Cluster</a></span></dt><dt><span class="sect2"><a href="SambaHA.html#id435651">Conclusions</a></span></dt></dl></dd></dl></div><div class="sect1" title="Features and Benefits"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id434489"></a>Features and Benefits</h2></div></div></div><p> 2 2 <a class="indexterm" name="id434496"></a> 3 3 <a class="indexterm" name="id434503"></a> … … 48 48 A clustered file server ideally has the following properties: 49 49 <a class="indexterm" name="id434687"></a> 50 <a class="indexterm" name="id43469 4"></a>50 <a class="indexterm" name="id434693"></a> 51 51 <a class="indexterm" name="id434700"></a> 52 52 <a class="indexterm" name="id434707"></a> 53 </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>All clients can connect transparently to any server.</p></li><li class="listitem"><p>A server can fail and clients are transparently reconnected to another server.</p></li><li class="listitem"><p>All servers serve out the same set of files.</p></li><li class="listitem"><p>All file changes are immediately seen on all servers.</p><div class="itemizedlist"><ul class="itemizedlist" type="circle"><li class="listitem"><p>Requires a distributed file system.</p></li></ul></div></li><li class="listitem"><p>Infinite ability to scale by adding more servers or disks.</p></li></ul></div></div><div class="sect2" title="Why Is This So Hard?"><div class="titlepage"><div><div><h3 class="title"><a name="id4347 50"></a>Why Is This So Hard?</h3></div></div></div><p>53 </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>All clients can connect transparently to any server.</p></li><li class="listitem"><p>A server can fail and clients are transparently reconnected to another server.</p></li><li class="listitem"><p>All servers serve out the same set of files.</p></li><li class="listitem"><p>All file changes are immediately seen on all servers.</p><div class="itemizedlist"><ul class="itemizedlist" type="circle"><li class="listitem"><p>Requires a distributed file system.</p></li></ul></div></li><li class="listitem"><p>Infinite ability to scale by adding more servers or disks.</p></li></ul></div></div><div class="sect2" title="Why Is This So Hard?"><div class="titlepage"><div><div><h3 class="title"><a name="id434749"></a>Why Is This So Hard?</h3></div></div></div><p> 54 54 In short, the problem is one of <span class="emphasis"><em>state</em></span>. 55 55 </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p> 56 <a class="indexterm" name="id43476 9"></a>56 <a class="indexterm" name="id434768"></a> 57 57 All TCP/IP connections are dependent on state information. 58 58 </p><p> … … 80 80 </p></li></ul></div><div class="sect3" title="The Front-End Challenge"><div class="titlepage"><div><div><h4 class="title"><a name="id434861"></a>The Front-End Challenge</h4></div></div></div><p> 81 81 <a class="indexterm" name="id434869"></a> 82 <a class="indexterm" name="id43487 6"></a>82 <a class="indexterm" name="id434875"></a> 83 83 <a class="indexterm" name="id434882"></a> 84 84 <a class="indexterm" name="id434889"></a> … … 91 91 layer level and then feed the SMB packet to different servers in the cluster. 92 92 </p><p> 93 <a class="indexterm" name="id43492 3"></a>93 <a class="indexterm" name="id434922"></a> 94 94 <a class="indexterm" name="id434929"></a> 95 95 One could split all IPC$ connections and RPC calls to one server to handle printing and user … … 141 141 <a class="indexterm" name="id435114"></a> 142 142 <a class="indexterm" name="id435121"></a> 143 <a class="indexterm" name="id43512 8"></a>143 <a class="indexterm" name="id435127"></a> 144 144 </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>NFS</p></li><li class="listitem"><p>AFS</p></li><li class="listitem"><p>OpenGFS</p></li><li class="listitem"><p>Lustre</p></li></ul></div><p> 145 145 <a class="indexterm" name="id435158"></a> … … 166 166 </p></div><div class="sect3" title="Server Pool Communications"><div class="titlepage"><div><div><h4 class="title"><a name="id435235"></a>Server Pool Communications</h4></div></div></div><p> 167 167 <a class="indexterm" name="id435243"></a> 168 <a class="indexterm" name="id4352 50"></a>168 <a class="indexterm" name="id435249"></a> 169 169 <a class="indexterm" name="id435256"></a> 170 170 <a class="indexterm" name="id435263"></a> … … 174 174 </p><p> 175 175 <a class="indexterm" name="id435275"></a> 176 <a class="indexterm" name="id43528 2"></a>176 <a class="indexterm" name="id435281"></a> 177 177 <a class="indexterm" name="id435288"></a> 178 178 All <code class="literal">smbd</code> processes in the server pool must of necessity communicate … … 192 192 We have yet to identify metrics for performance demands to enable this to happen 193 193 effectively. 194 </p></div><div class="sect3" title="Required Modifications to Samba"><div class="titlepage"><div><div><h4 class="title"><a name="id43536 7"></a>Required Modifications to Samba</h4></div></div></div><p>194 </p></div><div class="sect3" title="Required Modifications to Samba"><div class="titlepage"><div><div><h4 class="title"><a name="id435366"></a>Required Modifications to Samba</h4></div></div></div><p> 195 195 Samba needs to be significantly modified to work with a high-speed server interconnect 196 196 system to permit transparent failover clustering. … … 213 213 <a class="indexterm" name="id435425"></a> 214 214 <a class="indexterm" name="id435432"></a> 215 <a class="indexterm" name="id43543 9"></a>215 <a class="indexterm" name="id435438"></a> 216 216 Allowing failover servers to handle different functions within the exported file system 217 217 removes the problem of requiring a distributed locking protocol. … … 230 230 </p></div><div class="sect2" title="High-Availability Server Products"><div class="titlepage"><div><div><h3 class="title"><a name="id435490"></a>High-Availability Server Products</h3></div></div></div><p> 231 231 <a class="indexterm" name="id435498"></a> 232 <a class="indexterm" name="id43550 5"></a>233 <a class="indexterm" name="id43551 2"></a>232 <a class="indexterm" name="id435504"></a> 233 <a class="indexterm" name="id435511"></a> 234 234 <a class="indexterm" name="id435518"></a> 235 235 <a class="indexterm" name="id435525"></a> … … 239 239 link (LAN or serial). 240 240 </p><p> 241 <a class="indexterm" name="id43553 8"></a>241 <a class="indexterm" name="id435537"></a> 242 242 <a class="indexterm" name="id435544"></a> 243 243 <a class="indexterm" name="id435551"></a> … … 259 259 gracefully with backend failures, while at the same time providing continuity of service 260 260 to all network clients. 261 </p></div><div class="sect2" title="MS-DFS: The Poor Man's Cluster"><div class="titlepage"><div><div><h3 class="title"><a name="id43561 9"></a>MS-DFS: The Poor Man's Cluster</h3></div></div></div><p>261 </p></div><div class="sect2" title="MS-DFS: The Poor Man's Cluster"><div class="titlepage"><div><div><h3 class="title"><a name="id435618"></a>MS-DFS: The Poor Man's Cluster</h3></div></div></div><p> 262 262 <a class="indexterm" name="id435626"></a> 263 263 <a class="indexterm" name="id435633"></a> … … 269 269 Above all, at the cost of complexity of management, a distributed system (pseudo-cluster) can 270 270 be created using existing Samba functionality. 271 </p></div><div class="sect2" title="Conclusions"><div class="titlepage"><div><div><h3 class="title"><a name="id43565 2"></a>Conclusions</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>Transparent SMB clustering is hard to do!</p></li><li class="listitem"><p>Client failover is the best we can do today.</p></li><li class="listitem"><p>Much more work is needed before a practical and manageable high-availability transparent cluster solution will be possible.</p></li><li class="listitem"><p>MS-DFS can be used to create the illusion of a single transparent cluster.</p></li></ul></div></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Backup.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="optional.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="largefile.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 31. Backup Techniques </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 33. Handling Large Directories</td></tr></table></div></body></html>271 </p></div><div class="sect2" title="Conclusions"><div class="titlepage"><div><div><h3 class="title"><a name="id435651"></a>Conclusions</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>Transparent SMB clustering is hard to do!</p></li><li class="listitem"><p>Client failover is the best we can do today.</p></li><li class="listitem"><p>Much more work is needed before a practical and manageable high-availability transparent cluster solution will be possible.</p></li><li class="listitem"><p>MS-DFS can be used to create the illusion of a single transparent cluster.</p></li></ul></div></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Backup.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="optional.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="largefile.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 31. Backup Techniques </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 33. Handling Large Directories</td></tr></table></div></body></html>
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