What Are Multi-pathing Schemes And Which One To Use For Optimal Perfo

1.	What Are Multi-pathing Schemes And Which One To Use For Optimal Performance?
Answer» Servers/ hosts uses multipathing for failover from one path to the other when one path from the Servers/host to the SAN becomes unavailable, the host SWITCHES to another path. Servers/ hosts can also use multipathing for load balancing. Types of policy: Most RECENTLY Used: The path used by a LUN is not be altered unless an event instructs the path to change. I will use this policy is for Active/Passive arrays and many pseudo active/active arrays. Most recently used (mru) selects the path most recently used to send I/O to a device. Fixed: The path used by a LUN is ALWAYS the one marked as preferred, unless that path is unavailable I use this policy is for Active/Active arrays. Fixed (fixed) uses only the active path. Round ROBIN: Round robin (rr) uses the mru target selection policy and the any HBA selection policy to SELECT paths. Custom (custom) sets the LUN to expect a custom policy. Types of policy:

What Are Multi-pathing Schemes And Which One To Use For Optimal Performance?

Answer»

Servers/ hosts uses multipathing for failover from one path to the other when one path from the Servers/host to the SAN becomes unavailable, the host SWITCHES to another path.
Servers/ hosts can also use multipathing for load balancing.

Types of policy:

Most RECENTLY Used: The path used by a LUN is not be altered unless an event instructs the path to change. I will use this policy is for Active/Passive arrays and many pseudo active/active arrays. Most recently used (mru) selects the path most recently used to send I/O to a device.
Fixed: The path used by a LUN is ALWAYS the one marked as preferred, unless that path is unavailable I use this policy is for Active/Active arrays. Fixed (fixed) uses only the active path.
Round ROBIN: Round robin (rr) uses the mru target selection policy and the any HBA selection policy to SELECT paths.
Custom (custom) sets the LUN to expect a custom policy.

Types of policy: