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 iostat

This command displays the I/O statistics for a single disk, all disks in an array, or all the disks of all the arrays in the host. You can group the statistics by device or array. If no groupby is specified, then statistics is shown for all the paths. The statistics can be set to display after a specified number of seconds and for a specified number of times through this CLI option.

vxdmpadm iostat vxdmpadm [-g<DynamicDiskGroupName>] iostat [showdevice|showarray] [interval=#] [count=#] <DiskName> | p#c#t#l#> vxdmpadm [-g<DynamicDiskGroupName>] iostat [showdevice | showarray | showall] [groupby=<device | array>] [-u <KB | MB | GB>] [interval=seconds] [count=N] [<diskname | p#c#t#l#>]

The following attributes apply:

showdevice|showarray

Display I/O statistics:

  • showdevice specifies paths of the disk. (Default is showdevice.)

  • showarray specifies all the paths of the array that contains the disk.

showall

Displays the I/O statistics for all the paths of all the arrays that are connected to the host. Diskname should not be specified with this option.

groupby=device

The I/O statistics is shown per device.

If no groupby is specified, then statistics is shown for all devices.

groupby=array

The I/O statistics is shown per array

KB

Data that is read or written is shown in KiloBytes/Second

MB

Data that is read or written is shown in MegaBytes/Second

GB

Data that is read or written is shown in GigaBytes/Second

interval=#

# specifies the amount of time (seconds) between displays of the I/O statistics.

(Default value is 5 seconds between displays.)

count=#

# specifies the number of times the I/O statistics are displayed.

(Default is infinite number of displays.)

<DiskName>

The designated disk, which can be specified by the device name (such as Harddisk2) or the internal disk name (such as Disk2). The -g option must precede the internal disk name (for example, -gDG2 Disk1).

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.