Veritas InfoScale™ 7.4.1 Virtualization Guide - Linux on ESXi
- Section I. Overview
- About Veritas InfoScale solutions in a VMware environment
- Section II. Deploying Veritas InfoScale products in a VMware environment
- Getting started
- Understanding Storage Configuration
- Section III. Use cases for Veritas InfoScale product components in a VMware environment
- Application availability using Cluster Server
- Multi-tier business service support
- Improving storage visibility, availability, and I/O performance using Dynamic Multi-Pathing
- How DMP works
- Improving data protection, storage optimization, data migration, and database performance
- Protecting data with InfoScale product components in the VMware guest
- Optimizing storage with InfoScale product components in the VMware guest
- Migrating data with InfoScale product components in the VMware guest
- Improving database performance with InfoScale product components in the VMware guest
- Setting up virtual machines for fast failover using Storage Foundation Cluster File System High Availability on VMware disks
- About setting up Storage Foundation Cluster File High System High Availability on VMware ESXi
- Configuring coordination point (CP) servers
- Section IV. Reference
Load balancing
By default, DMP uses the Minimum Queue I/O policy for load balancing across paths for all array types. Load balancing maximizes I/O throughput by using the total bandwidth of all available paths. I/O is sent down the path that has the minimum outstanding I/Os.
For Active/Passive (A/P) disk arrays, I/O is sent down the primary paths. If all of the primary paths fail, I/O is switched over to the available secondary paths. As the continuous transfer of ownership of LUNs from one controller to another results in severe I/O slowdown, load balancing across primary and secondary paths is not performed for A/P disk arrays unless they support concurrent I/O.
For other arrays, load balancing is performed across all the currently active paths.
You can change the I/O policy for the paths to an enclosure or disk array. This operation is an online operation that does not impact the server or require any downtime.