<li><a href="#3.51 Can I authenticate to my af"> 3.51 Can I authenticate to my afs cell using multiple kerberos Realms?</a></li>
<li><a href="#3.52 Is it a good idea to store"> 3.52 Is it a good idea to store mail in AFS?</a></li>
<li><a href="#3.53 How can I ensure that the"> 3.53 How can I ensure that the userids on client machines match the users' pts ids?</a></li>
+ <li><a href="#3.54 What is Fast Restart?"> 3.54 What is Fast Restart?</a></li>
</ul>
</li>
</ul>
Some people have expressed the opinion that this is not a good idea. Assuming that a modern (one-file-per-message) format is being used, the concrete reasons to avoid storing mail in AFS include:
-1. AFS is not designed to provide good performance under the sort of concurrent accesses that occur when many mail server machines share a common space in AFS; see [this message](http://www.openafs.org/pipermail/openafs-info/2007-June/026621.html) for more information. This does not apply to situations where there is a single mail server for a particular user.
+1. AFS is not designed to provide good performance under the sort of concurrent accesses that occur when many mail server machines share a common space in AFS; see [this message](http://www.openafs.org/pipermail/openafs-info/2007-June/026621.html) for more information.
+ - This does not apply to situations where there is a single mail server for a particular user.
+ - This also may not apply if [Callback Extended Information](http://michigan-openafs-lists.central.org/archives/afs3-standardization/2008-May/000123.html) is implemented.
### <a name="3.53 How can I ensure that the"></a><a name="3.53 How can I ensure that the "></a> 3.53 How can I ensure that the userids on client machines match the users' pts ids?
You can use [libnss-afs](http://www.hcoop.net/~megacz/software/libnss-afs.html) for this.
+
+### <a name="3.54 What is Fast Restart?"></a> 3.54 What is Fast Restart?
+
+When compiled with --enable-fast-restart, the file server will start up immediately, without first salvaging any volumes which cannot be attached.
+
+Disadvantages to Fast Restart, [as noted here](http://lists.openafs.org/pipermail/openafs-info/2008-May/029386.html) include:
+
+1. Volumes in need of salvage remain offline until an administrator intervenes manually
+2. On an inode-based fileserver, salvaging a single volume crawls every inode; therefore, salvaging volumes individually (rather than partition-at-a-time) duplicates work.