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UUID and Other Persistent Identifiers
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If there are multiple paths from a system to a device, device-mapper-multipath uses the WWID to
detect this. Device-mapper-multipath then presents a single "pseudo-device" in /dev/mapper/
wwid, such as /dev/mapper/3600508b400105df70000e00000ac0000.
The command multipath -l shows the mapping to the non-persistent identifiers:
Host:Channel:Target:LUN, /dev/sd name, and the major:minor number.
3600508b400105df70000e00000ac0000 dm-2 vendor,product
[size=20G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
\_ 5:0:1:1 sdc 8:32 [active][undef]
\_ 6:0:1:1 sdg 8:96 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 5:0:0:1 sdb 8:16 [active][undef]
\_ 6:0:0:1 sdf 8:80 [active][undef]
Device-mapper-multipath automatically maintains the proper mapping of each WWID-based device
name to its corresponding /dev/sd name on the system. These names are persistent across path
changes, and they are consistent when accessing the device from different systems.
When the user_friendly_names feature (of device-mapper-multipath) is used, the WWID is
mapped to a name of the form /dev/mapper/mpathn. By default, this mapping is maintained in the
file /var/lib/multipath/bindings. These mpathn names are persistent as long as that file is
maintained.
Warning
The multipath bindings file (by default, /var/lib/multipath/bindings) must be available at
boot time. If /var is a separate file system from /, then you must change the default location of
the file. For more information, refer to http://kbase.redhat.com/faq/docs/DOC-17650.
Important
If you use user_friendly_names, then additional steps are required to obtain consistent
names in a cluster. Refer to the Consistent Multipath Device Names
1
section in the Using Device-
Mapper Multipath
2
book.
In addition to these persistent names provided by the system, you can also use udev rules to
implement persistent names of your own, mapped to the WWID of the storage. For more information
about this, refer to http://kbase.redhat.com/faq/docs/DOC-7319.
21.3.2. UUID and Other Persistent Identifiers
If a storage device contains a file system, then that file system may provide one or both of the
following:
• Universally Unique Identifier (UUID)
1
http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/DM_Multipath/multipath_consistent_names.html
2
http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/DM_Multipath/index.html
- 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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