Understanding live migration "migration_max_bandwidth" and "max_outgoing_migrations" parameters in vdsm.conf

Solution Verified - Updated -

Issue

  • Is there any theory on how to configure the migration_max_bandwidth and max_outgoing_migrations parameters in /etc/vdsm/vdsm.conf?

  • We are using RHEV environment and now considering to optimize performance of migrations. We found the following parameters in /usr/share/doc/vdsm*/vdsm.conf.sample. How do those parameters work ? What should I be careful with when tuning these parameters ?

# migration_max_bandwidth = <X>

<..snip..>

# max_outgoing_migrations = <Z>

Note: the file vdsm.conf.sample is available only on RHEL base hypervisor. Not on RHEV-H environment. Also the values and comments depends on versions of vdsm package.

Environment

  • Red Hat Enterprise Virtualization 3.0 --> 3.5

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