Table Of Contents - Red Hat ENTERPRISE LINUX 5 DM MULTIPATH Configuration And Administration Manual

Preface
1. Audience ........................................................................................................................ v
2. Related Documentation ................................................................................................... v
3. Feedback ....................................................................................................................... vi
4. Document Conventions ................................................................................................... vi
4.1. Typographic Conventions ..................................................................................... vi
4.2. Pull-quote Conventions ....................................................................................... viii
4.3. Notes and Warnings ........................................................................................... viii
1. Device Mapper Multipathing
1.1. Overview of DM-Multipath ............................................................................................. 1
1.2. Storage Array Support .................................................................................................. 3
1.3. DM-Multipath Components ............................................................................................ 3
1.4. DM-Multipath Setup Overview ....................................................................................... 4
2. Multipath Devices
2.1. Multipath Device Identifiers ........................................................................................... 5
2.2. Consistent Multipath Device Names in a Cluster ............................................................ 5
2.3. Multipath Device Attributes ........................................................................................... 6
2.4. Multipath Devices in Logical Volumes ............................................................................ 6
3. Setting Up DM-Multipath
3.1. Setting Up DM-Multipath ............................................................................................... 7
3.2. Ignoring Local Disks when Generating Multipath Devices ................................................ 8
3.3. Adding Devices to the Multipathing Database ............................................................. 10
4. The DM-Multipath Configuration File
4.1. Configuration File Overview ........................................................................................ 11
4.2. Configuration File Blacklist .......................................................................................... 12
4.2.1. Blacklisting by WWID ....................................................................................... 12
4.2.2. Blacklisting By Device Name ............................................................................ 12
4.2.3. Blacklisting By Device Type ............................................................................. 13
4.2.4. Blacklist Exceptions ......................................................................................... 13
4.3. Configuration File Defaults .......................................................................................... 14
4.4. Multipaths Device Configuration Attributes ................................................................... 17
4.5. Configuration File Devices .......................................................................................... 18
5. DM-Multipath Administration and Troubleshooting
5.1. Resizing an Online Multipath Device ........................................................................... 23
5.2. The Multipath Daemon ............................................................................................... 24
5.3. Issues with Large Number of LUNs ............................................................................. 24
5.4. Issues with queue_if_no_path feature .......................................................................... 24
5.5. Multipath Command Output ........................................................................................ 25
5.6. Multipath Queries with multipath Command ................................................................. 25
5.7. Multipath Command Options ....................................................................................... 26
5.8. Determining Device Mapper Entries with the dmsetup Command ................................... 26
5.9. Troubleshooting with the multipathd Interactive Console ................................................ 27
A. Revision History
Index
v
1
5
7
11
23
29
31
iii