Users Guide

Configure Failover Policy Settings

When you have configured multiple data pathways, it is appropriate to configure MPIO DSM to balance data traffic loads across the

pathways. Choose from:

• Least Queue Depth—(Recommended) MPIO DSM sends SAN data traffic packets out to each available connection, with preference

given to the connection that is least busy at the time it requests the I/O. This option is appropriate for most installations.

• Round Robin—MPIO DSM sends SAN data traffic packets over each available connection in a rotating sequence, fully utilizing all

available paths.

• Fail Over Only—MPIO DSM uses one connection for all SAN data traffic until it times out or otherwise fails. At that time, traffic fails

over to any other available path. Selecting this load balance policy causes the EHCM service to no longer add and remove additional

sessions to the target.

For both the Round Robin and Least Queue Depth policies, sessions to the group member containing the data are given preference over

other sessions.

Configure MPIO Connections Settings

The MPIO Connections settings allow you to choose whether or not to use MPIO for snapshots, and to specify other connection

properties. To use MPIO for snapshots, select the checkbox next to that option.

For volumes that span multiple group members, you can specify the following attributes:

• Maximum sessions for a volume—Values range from 1 to 12 (the default is 6). This value should be equal to or greater than the value

you specify for the maximum sessions per volume slice.

• Maximum sessions per volume slice—Values range from 1 to 4 (the default is 2).

Configure the Network

1. In the Included Networks and Excluded Networks panels, make sure the information displayed is correct for your environment.

2. To exclude a subnet in the Included Networks panel, click the Exclude link under Action.

The excluded subnet moves into the Excluded Networks panel.

3. To restore an excluded subnet, click the Include link in the Excluded Networks panel.

4. Click Save to save your settings.

Press F1 to view online help for any of these dialog boxes.

Configure the Network Connections

1. Choose between IPv4 or IPv6 (if available) for the MPIO IP version.

2. (Optional) Select the checkbox to exclude new subnets as they are configured. Use this option to prevent all new subnets from being

enabled automatically, so that you can control which ones are added over time.

You can also control the minimum adapter speed, which specifies the slowest acceptable speed that a NIC can have when used for

MPIO. The choices are based on the speeds of the NICs available on the host machine. If only one speed is available, this drop-down

list contains only this speed.

Configure ASM/ME