VMware Most Recently Used (MRU) is a path selection policy used in VMware ESXi for multipathing.
How MRU works:
1. Definition: MRU is a path selection policy that selects the most recently used path for I/O operations.
2. How it works: The ESXi host keeps track of the most recently used path for each storage device and uses that path for subsequent I/O operations.
3. Path switching: If the most recently used path becomes unavailable, the ESXi host switches to an alternate path.
Advantages of MRU:
1. Improved performance: MRU can improve performance by reducing the overhead of path switching.
2. Reduced latency: MRU can reduce latency by using the most recently used path, which is likely to be the fastest path.
Disadvantages of MRU:
1. Path congestion: MRU can lead to path congestion if multiple VMs are using the same most recently used path.
2. Path thrashing: MRU can lead to path thrashing if the most recently used path is constantly switching between different paths.
When to use MRU:
1. Low-latency environments: Use MRU in environments where low latency is critical, such as in real-time applications.
2. High-performance environments: Use MRU in environments where high performance is critical, such as in database or virtual desktop infrastructure (VDI) environments.
Configuration:
To configure MRU in ESXi:
1. Log in to the vSphere Client.
2. Select the ESXi host.
3. Click on "Configuration" and then "Storage".
4. Select the storage device.
5. Click on "Properties" and then "Path Selection Policy".
6. Select "Most Recently Used (MRU)" as the path selection policy.
Comments
Post a Comment