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Chapter 10. Network File System (NFS)
76
becomes available. since UDP is connectionless, the client continues to pound the network with
data until the server re-establishes a connection.
The main disadvantage with TCP is that there is a very small performance hit due to the overhead
associated with the protocol.
10.10. References
Administering an NFS server can be a challenge. Many options, including quite a few not mentioned
in this chapter, are available for exporting or mounting NFS shares. Consult the following sources for
more information.
Installed Documentation
• /usr/share/doc/nfs-utils-version/ — This directory contains a wealth of information
about the NFS implementation for Linux, including a look at various NFS configurations and their
impact on file transfer performance.
• man mount — Contains a comprehensive look at mount options for both NFS server and client
configurations.
• man fstab — Gives details for the format of the /etc/fstab file used to mount file systems at
boot-time.
• man nfs — Provides details on NFS-specific file system export and mount options.
• man exports — Shows common options used in the /etc/exports file when exporting NFS file
systems.
Useful Websites
• http://nfs.sourceforge.net/ — The home of the Linux NFS project and a great place for project status
updates.
• http://www.citi.umich.edu/projects/nfsv4/linux/ — An NFSv4 for Linux 2.6 kernel resource.
• http://www.nfsv4.org
2
— The home of NFS version 4 and all related standards.
• http://www.vanemery.com/Linux/NFSv4/NFSv4-no-rpcsec.html — Describes the details of NFSv4
with Fedora Core 2, which includes the 2.6 kernel.
• http://www.nluug.nl/events/sane2000/papers/pawlowski.pdf — An excellent whitepaper on the
features and enhancements of the NFS Version 4 protocol.
• http://wiki.autofs.net — The Autofs wiki, discussions, documentation and enhancements.
Related Books
• Managing NFS and NIS by Hal Stern, Mike Eisler, and Ricardo Labiaga; O'Reilly & Associates —
Makes an excellent reference guide for the many different NFS export and mount options available.
• NFS Illustrated by Brent Callaghan; Addison-Wesley Publishing Company — Provides comparisons
of NFS to other network file systems and shows, in detail, how NFS communication occurs.
- Red Hat Enterprise Linux 6 1
- Administration Guide 1
- Storage Administration Guide 2
- Enterprise Linux 6 3
- Edition 0 3
- 1. Document Conventions 9
- 1.2. Pull-quote Conventions 10
- 1.3. Notes and Warnings 11
- 2.1. Do You Need Help? 11
- 2.2. We Need Feedback! 12
- Overview 13
- Storage Considerations During 15
- Installation 15
- 2.3. Special Considerations 16
- LVM (Logical Volume Manager) 19
- 3.1. What is LVM2? 20
- 3.2. Using system-config-lvm 20
- 3.2.3. Migrating Extents 25
- 3.3. References 33
- Partitions 35
- 4.2. Creating a Partition 37
- 4.2.3. Add to /etc/fstab 38
- 4.3. Removing a Partition 39
- 4.4. Resizing a Partition 39
- File System Structure 41
- 5.2.1.2. The /boot/ Directory 43
- 5.2.1.3. The /dev/ Directory 43
- 5.2.1.9. The /proc/ Directory 45
- 5.2.1.11. The /srv/ Directory 45
- 5.2.1.12. The /sys/ Directory 45
- 5.2.1.13. The /usr/ Directory 46
- 5.2.1.14. The /var/ Directory 47
- The Ext3 File System 51
- New Mount Option: data_err 52
- More Efficient Storage Use 52
- The Ext4 File System 55
- Global File System 2 59
- The XFS File System 61
- 9.3. XFS Quota Management 63
- Setting Project Limits 64
- end: ino 1 offset 0 67
- mfile end: ino 1 offset 0 67
- Network File System (NFS) 69
- 10.1.1. Required Services 70
- 10.3. autofs 72
- 10.3.2. autofs Configuration 74
- 10.6.2. The exportfs Command 82
- 10.7. Securing NFS 84
- 10.7.2. Host Access in NFSv4 85
- 10.7.3. File Permissions 85
- 10.8. NFS and rpcbind 86
- 10.9. Using NFS over TCP 87
- 10.10. References 88
- FS-Cache 89
- 11.1. Performance Guarantee 90
- 11.2. Setting Up a Cache 90
- 11.3.1. Cache Sharing 91
- 11.5. Statistical Information 93
- 11.6. References 94
- Encrypted File System 95
- 12.2. Additional Information 96
- 13.1. What is RAID? 97
- 13.2. Who Should Use RAID? 97
- 13.3. RAID Types 97
- Software RAID 98
- 13.5. Linux RAID Subsystems 100
- 13.7. Configuring RAID Sets 101
- Swap Space 103
- 14.2.3. Creating a Swap File 104
- 14.3. Removing Swap Space 105
- 14.4. Moving Swap Space 106
- Disk Quotas 107
- 15.2. Managing Disk Quotas 110
- Best method for most systems 111
- 15.3. References 112
- Access Control Lists 113
- 16.3. Setting Default ACLs 114
- 16.4. Retrieving ACLs 114
- 16.7. References 116
- Write Barriers 117
- Disabling Write Caches 118
- Battery-Backed Write Caches 118
- High-End Arrays 119
- 18.2. Userspace Access 122
- 18.3. Standards 122
- 18.4. Stacking I/O Parameters 123
- 0, and minimum_io_size is a 124
- File System tools 125
- Solid-State Disk Deployment 131
- Guidelines 131
- 20.2. Tuning Considerations 132
- Online Storage Management 133
- 21.2. iSCSI 135
- 21.3. Persistent Naming 135
- 21.3.1. WWID 136
- Important 137
- local timeout=20 142
- local done=1 142
- 21.16.1. Fibre Channel 154
- SCSI Error Handler 156
- 21.16.3. iSCSI Root 157
- 21.18. Troubleshooting 158
- 22.1. Virtual Storage 161
- 22.2. DM-Multipath 161
- Appendix A. Revision History 163
- Glossary 165
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