Dynamic Multi-Pathing 8.0.1 Administrator's Guide - Windows

Last Published:
Product(s): InfoScale & Storage Foundation (8.0.1)
Platform: Windows
  1. Understanding DMPW
    1.  
      DMP overview
    2.  
      Major features of Dynamic Multi-Pathing
    3. How DMP works
      1. How DMP monitors I/O on paths
        1.  
          Path failover mechanism
      2.  
        Load balancing
      3.  
        DMP in a clustered environment
    4.  
      Multiple paths to disk arrays
    5.  
      Device discovery
  2. Setting up DMPW
    1.  
      Active/Active and Active/Passive settings
    2. Active/Active and Active/Passive settings in a cluster environment
      1.  
        DMP DSMs
      2.  
        SCSI-3 PGR technology
      3.  
        Enabling SCSI-3 PGR
    3. Add and remove paths
      1.  
        Adding a path
      2.  
        Removing a path
    4. Specify load balancing settings and the primary path
      1.  
        Specifying load balancing settings for an array
      2.  
        Specifying load balancing settings for a disk
      3.  
        Specifying the primary path for an array or disk
    5. Configuring DSMs without storage connection
      1.  
        Specify DSM settings without storage connection
  3. Administering DMPW
    1.  
      About administering DMP
    2. DMP DSMs menus
      1.  
        Displaying the menu for arrays
      2.  
        Commands for arrays
      3.  
        Displaying the menu for disks
      4.  
        Commands for paths of a disk
      5.  
        Statistics monitoring
      6.  
        Clear performance statistics
      7.  
        Device settings
      8.  
        Set primary path
      9.  
        Properties
    3. View array, disk, and path status
      1.  
        Array status
      2.  
        Device status
      3.  
        Path status
    4. vxdmpadm
      1.  
        vxdmpadm dsminfo
      2.  
        vxdmpadm arrayinfo
      3.  
        vxdmpadm deviceinfo
      4.  
        vxdmpadm pathinfo
      5.  
        vxdmpadm arrayperf
      6.  
        vxdmpadm deviceperf
      7.  
        vxdmpadm pathperf
      8.  
        vxdmpadm allperf
      9.  
        vxdmpadm iostat
      10.  
        vxdmpadm cleardeviceperf
      11.  
        vxdmpadm cleararrayperf
      12.  
        vxdmpadm clearallperf
      13.  
        vxdmpadm setdsmscsi3
      14.  
        vxdmpadm setarrayscsi3
      15.  
        vxdmpadm setattr dsm
      16.  
        vxdmpadm setattr array
      17.  
        vxdmpadm setattr device
      18.  
        vxdmpadm setattr path
      19.  
        vxdmpadm set isislog
      20.  
        vxdmpadm rescan
      21.  
        vxdmpadm disk list
      22.  
        vxdmpadm getdsmattrib
      23.  
        vxdmpadm getmpioparam
      24.  
        vxdmpadm setmpioparam
  4. Performance tuning
    1.  
      Specifying control timer settings for an array
  5. Troubleshooting
    1. Resolving DMP issues
      1.  
        When a DMP license is no longer valid
      2.  
        When an unknown disk group appears in a DMP environment
    2. Using status information
      1.  
        Path status
      2.  
        Path states
  6. Glossary
    1.  
      Dynamic Multi-Pathing glossary

vxdmpadm setattr device

vxdmpadm setattr device [loadbalancepolicy=FO|RR|RS [path#=state#] |LQ|WP [path#=weight#]|LB|BP [blockshift=#]] [primarypath=#] <DiskName> | p#c#t#l#>

This command sets the load balance policy and primary path of the device to which the designated disk belongs. The following attributes apply:

loadbalancepolicy=

FO|RR|RS|

LQ| WP|LB

Specifies the load balance policy for the device where:

  • FO specifies Fail Over Only (Active/Passive)

  • RR specifies Round Robin (Active/Active)

  • RS specifies Round Robin with Subset

  • LQ specifies Dynamic Least Queue Depth

  • WP specifies Weighted Paths

  • LB specifies Least Blocks

  • BP specifies Balanced Path

path#=state#

state# specifies either standby (0) or active (1) state of the specified path#. For example, 1-1-1=0 means that path 1-1-1 is assigned a state of standby.

(Default state of a path is active (1).)

path#=weight#

weight# specifies the weight that is assigned to the specified path#. For example, 1-1-1=10 means that path 1-1-1 is assigned a weight of 10. The path with the lowest weight indicates the most-favored path for I/O.

(Range of values for weight#: 0 - 255.)

blockshift=#

# specifies the number of contiguous I/O blocks that are sent along a path to an Active/Active array before switching to the next available path.

(Default value is 2048 blocks.)

primarypath=#

# specifies the primary path of the device. For example, primarypath=1-1-1 sets path 1-1-1 as the primary path of the device.

<DiskName>

The designated disk, which can be specified by the device name (such as Harddisk2).

p#c#t#l#

The #s correspond to the port, channel, target, and LUN of a disk.

Example

vxdmpadm setattr device loadbalancepolicy=FO primarypath=1-1-0 
Harddisk6

Sets the load balance policy of the device to Fail Over Only (Active/Passive) and the primary path to path 1-1-0 for Harddiskd6.