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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
Adding new LUNs dynamically to a target ID
Dynamic Multi-Pathing (DMP) provides a Dynamic Reconfiguration tool to simplify the addition of new LUNs to a new or existing target ID. One or more new LUNs are mapped to the host by way of multiple HBA ports. An operating system device scan is issued for the LUNs to be recognized and added to DMP control.
Warning:
Do not run any device discovery operations outside of the Dynamic Reconfiguration tool until the device operation is completed.
In a cluster, perform the steps on all the nodes in the cluster.
To add new LUNs dynamically to a target ID
- Start the vxdiskadm utility:
# vxdiskadm
- Select the Dynamic Reconfiguration operations option from the vxdiskadm menu.
- Select the Add LUNs option.
Output similar to the following is displayed:
Add Luns Menu: VolumeManager/Disk/DynamicReconfigurationOperations/AddLuns INFO: Refreshing OS device Tree INFO: Updating VxVM device tree Add LUNs from array, once done then press 'y' to continue or 'q' to quit. :
- The following are sample EMC Symmetrix commands:
# symmask -sid 822 -wwn 2001000e1ec307de -dir 16c -p 0 add devs 0119 -nopr # symmask -sid 822 -wwn 2001000e1ec307de -dir 16c -p 1 add devs 0119 -nopr # symmask -sid 822 -wwn 2001000e1ec307df -dir 16c -p 0 add devs 0119 -nopr # symmask -sid 822 -wwn 2001000e1ec307df -dir 16c -p 1 add devs 0119 -nopr # symmask -sid 822 refresh -nopr Symmetrix FA/SE directors updated with contents of SymMask Database 000290300822
- When the prompt displays, add the LUNs from the array.
Output similar to the following is displayed:
Add LUNs from array, once done then press 'y' to continue or 'q' to quit. : y Add Luns Menu: VolumeManager/Disk/DynamicReconfigurationOperations/AddLuns INFO: Refreshing OS device Tree INFO: Updating VxVM device tree INFO: Updating partition table information and disk size INFO: Number of Paths for Lun [emc0_0119] presented=4 INFO: Updating VxVM device tree
- Select y to continue to add the LUNs to DMP.
DMP updates the operating system device tree and the VxVM device tree. The newly-discovered devices are now visible.
--------------------------------------------------------- Luns Added --------------------------------------------------------- Enclosure=emc0 AVID=0119 Device=emc0_0119 Serial=2200119000 PATH=sdaf ctlr=c11 port=16c-1 [-] PATH=sdah ctlr=c12 port=16c-0 [-] PATH=sdaj ctlr=c12 port=16c-1 [-] PATH=sdad ctlr=c11 port=16c-0 [-] --------------------------------------------------------- Press <Enter> or <Return> to continue:
- Specify the dynamic reconfiguration operation to be done:
Specify Dynamic Reconfiguration Operation to be done: Menu: VolumeManager/Disk/DynamicReconfigurationOperations 1 Add Luns 2 Remove Luns 3 Replace Luns 4 Replace HBA ? Display help about menu ?? Display help about the menuing system q Exit Select an operation to perform : q
To exit the Dynamic Reconfiguration tool, enter: q