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Dynamic Multi-Pathing 7.4.1 Administrator's Guide - Linux
Last Published:
2019-02-01
Product(s):
InfoScale & Storage Foundation (7.4.1)
Platform: Linux
- Understanding DMP
- Setting up DMP to manage native devices
- About setting up DMP to manage native devices
- Displaying the native multi-pathing configuration
- Migrating LVM volume groups to DMP
- Migrating to DMP from EMC PowerPath
- Migrating to DMP from Hitachi Data Link Manager (HDLM)
- Migrating to DMP from Linux Device Mapper Multipath
- Using Dynamic Multi-Pathing (DMP) devices with Oracle Automatic Storage Management (ASM)
- Enabling Dynamic Multi-Pathing (DMP) devices for use with Oracle Automatic Storage Management (ASM)
- Removing Dynamic Multi-Pathing (DMP) devices from the listing of Oracle Automatic Storage Management (ASM) disks
- Migrating Oracle Automatic Storage Management (ASM) disk groups on operating system devices to Dynamic Multi-Pathing (DMP) devices
- Adding DMP devices to an existing LVM volume group or creating a new LVM volume group
- Removing DMP support for native devices
- Administering DMP
- About enabling and disabling I/O for controllers and storage processors
- About displaying DMP database information
- Displaying the paths to a disk
- Setting customized names for DMP nodes
- Administering DMP using the vxdmpadm utility
- Retrieving information about a DMP node
- Displaying consolidated information about the DMP nodes
- Displaying the members of a LUN group
- Displaying paths controlled by a DMP node, controller, enclosure, or array port
- Displaying information about controllers
- Displaying information about enclosures
- Displaying information about array ports
- User-friendly CLI outputs for ALUA arrays
- Displaying information about devices controlled by third-party drivers
- Displaying extended device attributes
- Suppressing or including devices from VxVM control
- Gathering and displaying I/O statistics
- Setting the attributes of the paths to an enclosure
- Displaying the redundancy level of a device or enclosure
- Specifying the minimum number of active paths
- Displaying the I/O policy
- Specifying the I/O policy
- Disabling I/O for paths, controllers, array ports, or DMP nodes
- Enabling I/O for paths, controllers, array ports, or DMP nodes
- Renaming an enclosure
- Configuring the response to I/O failures
- Configuring the I/O throttling mechanism
- Configuring Subpaths Failover Groups (SFG)
- Configuring Low Impact Path Probing (LIPP)
- Displaying recovery option values
- Configuring DMP path restoration policies
- Stopping the DMP path restoration thread
- Displaying the status of the DMP path restoration thread
- Configuring Array Policy Modules
- Administering disks
- About disk management
- Discovering and configuring newly added disk devices
- Partial device discovery
- About discovering disks and dynamically adding disk arrays
- About third-party driver coexistence
- How to administer the Device Discovery Layer
- Listing all the devices including iSCSI
- Listing all the Host Bus Adapters including iSCSI
- Listing the ports configured on a Host Bus Adapter
- Listing the targets configured from a Host Bus Adapter or a port
- Listing the devices configured from a Host Bus Adapter and target
- Getting or setting the iSCSI operational parameters
- Listing all supported disk arrays
- Excluding support for a disk array library
- Re-including support for an excluded disk array library
- Listing excluded disk arrays
- Listing disks claimed in the DISKS category
- Displaying details about an Array Support Library
- Adding unsupported disk arrays to the DISKS category
- Removing disks from the DISKS category
- Foreign devices
- Changing the disk device naming scheme
- Discovering the association between enclosure-based disk names and OS-based disk names
- Dynamic Reconfiguration of devices
- About online Dynamic Reconfiguration
- Reconfiguring a LUN online that is under DMP control using the Dynamic Reconfiguration tool
- Manually reconfiguring a LUN online that is under DMP control
- Overview of manually reconfiguring a LUN
- Manually removing LUNs dynamically from an existing target ID
- Manually adding new LUNs dynamically to a new target ID
- About detecting target ID reuse if the operating system device tree is not cleaned up
- Scanning an operating system device tree after adding or removing LUNs
- Manually cleaning up the operating system device tree after removing LUNs
- Changing the characteristics of a LUN from the array side
- Upgrading the array controller firmware online
- Reformatting NVMe devices manually
- Event monitoring
- Performance monitoring and tuning
- About tuning Dynamic Multi-Pathing (DMP) with templates
- DMP tuning templates
- Example DMP tuning template
- Tuning a DMP host with a configuration attribute template
- Managing the DMP configuration files
- Resetting the DMP tunable parameters and attributes to the default values
- DMP tunable parameters and attributes that are supported for templates
- DMP tunable parameters
- Appendix A. DMP troubleshooting
- Appendix B. Reference
Manually adding new LUNs dynamically to a new target ID
In this case, a new group of LUNs is mapped to the host via multiple HBA ports. An operating system device scan is issued for the LUNs to be recognized and added to DMP control.
The high-level procedure and the DMP commands are generic. However, the operating system commands may vary depending on the Linux version. For example, the following procedure uses Linux Suse10.
To add new LUNs dynamically to a new target ID
- Prior to any dynamic reconfiguration, ensure that the dmp_cache_open tunable is set to
on. This setting is the default.# vxdmpadm gettune dmp_cache_open
If the tunable is set to
off, set the dmp_cache_open tunable toon.# vxdmpadm settune dmp_cache_open=on
- Identify which LUNs to add to the host. Do one of the following:
Use Storage Array Management to identify the Array Volume ID (AVID) for the LUNs.
If the array does not report the AVID, use the LUN index.
- Map/mask the LUNs to the new target IDs on multiple hosts.
- Scan the operating system device.
Repeat step 2 and step 3 until you see that all the LUNs have been added.
- Use DMP to perform a device scan. You must perform this operation on all nodes in a cluster. Enter one of the following commands:
# vxdctl enable
# vxdisk scandisks
- Refresh the DMP device name database using the following command:
# vxddladm assign names
- Verify that the LUNs were added correctly by answering the following questions:
Do the newly provisioned LUNs appear in the vxdisk list output?
Are the configured paths present for each LUN?
If the answer to any of these questions is "No," return to step 2 and begin the procedure again.
If the answer to all of the questions is "Yes," the LUNs have been successfully added. You can now add the LUNs to a disk group, create new volumes, or grow existing volumes.
If the dmp_native_support tunable is set to ON and the new LUN does not have a VxVM label or is not claimed by a TPD driver then the LUN is available for use by LVM.