Setting the DMP policy for handling I/O for vSCSI devices

Article:HOWTO74845  |  Created: 2012-03-26  |  Updated: 2012-03-27  |  Article URL http://www.symantec.com/docs/HOWTO74845
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How To


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Subject


Setting the DMP policy for handling I/O for vSCSI devices

See Setting up DMP for vSCSI devices in the Virtual I/O Client

See How DMP handles I/O for vSCSI devices

See Adding and removing DMP support for vSCSI devices for an array

See Using Storage Foundation in the VIO client with virtual SCSI devices

By default, DMP balances the I/O load across VIO servers. This behavior sets the I/O policy attribute to lunbalance.

To display the current I/O policy attribute for the vSCSI array

  • Display the current I/O policy for a vSCSI array:

    # vxdmpadm getattr vscsi iopolicy
    VSCSI     DEFAULT      CURRENT
    ============================================
    IOPolicy  lunbalance   lunbalance

To turn off the LUN balancing, set the I/O policy attribute for the vSCSI array to nolunbalance.

To set the I/O policy attribute for the vSCSI array

  • Set the I/O policy for a vSCSI array:

    # vxdmpadm setattr vscsi iopolicy={lunbalance|nolunbalance}

Note:

The DMP I/O policy for each vSCSI device is always Single-Active. You cannot change the DMP I/O policy for the vSCSI enclosure. Only one VIO server can be Active for each vSCSI device.


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