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 setmpioparam

vxdmpadm setmpioparam [default] |[PathVerifyEnabled=0|1] [PathVerificationPeriod=#][PDORemovePeriod=#] [RetryCount=#] [RetryInterval=#] [dsmName=ALL | <DsmFileName>]

This command enables changing MPIO timer parameters or restoring default MPIO timer parameters.

Warning:

Veritas DSMs always use the default MPIO timer parameters. Therefore, this command should be used only when Microsoft has advised to change the settings for debugging purposes. Attempting to change these MPIO parameters would affect the behavior of a DSM for I/O error, path failover, and DSM performance.

default

Restores the default settings of these MPIO parameters

PathVerifyEnabled=0|1

Default: 0 (not enabled)

If enabled (value 1) MPIO performs path verification every N seconds where N is the value set in PathVerificationPeriod.

PathVerificationPeriod=#

# specifies the amount of time MPIO performs the path verification, if path verification is enabled. Default: 30 seconds. Maximum value: MAXULONG.

PDORemovePeriod=#

# specifies the amount of time an MPIO pseudo LUN, which represents a disk under MPIO control, stays in memory after all paths of a disk have been removed from the system. It also specifies how long the pending I/O should fail after all paths have been removed from a disk. Default: 20 seconds. Maximum value: MAXULONG.

RetryCount=#

# specifies the number of times DSM asks MPIO to retry the I/O when an I/O error occurs. Default: 3. There is no maximum value.

RetryInterval=#

# specifies the amount of time MPIO should retry a failed I/O. Default: 1 second.

dsmName = ALL |<DsmFileName>

Specifies whether to apply these settings to all installed DSMs or only to the DSM specified by file name.

Note:

You can use the vxdmpadm getdsmattrib command if you want to find out the file names of installed DSMs.