Red Hat DEVICE-MAPPER MULTIPATH 5.2, Configuration And Administration Manual

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Preface .................................................................................................................... vii
1. Audience ...................................................................................................... vii
2. Related Documentation ................................................................................. vii
3. Feedback .................................................................................................... viii
4. Document Conventions ................................................................................ viii
1. Device Mapper Multipathing .................................................................................... 1
1. Overview of DM-Multipath ............................................................................... 1
2. Storage Array Support .................................................................................... 4
3. DM-Multipath Components ............................................................................. 4
4. DM-Multipath Setup Overview ......................................................................... 5
2. Multipath Devices ................................................................................................... 7
1. Multipath Device Identifiers ............................................................................. 7
2. Consistent Multipath Device Names in a Cluster .............................................. 7
3. Multipath Device Attributes ............................................................................. 8
4. Multipath Devices in Logical Volumes .............................................................. 8
3. Setting Up DM-Multipath ........................................................................................11
1. Setting Up DM-Multipath ................................................................................11
2. Ignoring Local Disks when Generating Multipath Devices ................................12
3. Adding Devices to the Multipathing Database .................................................14
4. The DM-Multipath Configuration File ......................................................................17
1. Configuration File Overview ...........................................................................17
2. Configuration File Blacklist .............................................................................18
2.1. Blacklisting by WWID .........................................................................18
2.2. Blacklisting By Device Name ...............................................................19
2.3. Blacklisting By Device Type ................................................................19
2.4. Blacklist Exceptions ............................................................................20
3. Configuration File Defaults .............................................................................20
4. Multipaths Device Configuration Attributes ......................................................23
5. Configuration File Devices .............................................................................25
5. DM-Multipath Administration and Troubleshooting ...................................................29
1. Multipath Command Output ...........................................................................29
2. Multipath Queries with multipath Command ....................................................30
3. Multipath Command Options ..........................................................................30
4. Determining Device Mapper Entries with the dmsetup Command .....................31
5. Troubleshooting with the multipathd Interactive Console ..................................31
Index .......................................................................................................................33
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