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VMware vCenter Cookbook by Konstantin Kuminsky

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Configuring storage load balancing thresholds

Storage distributed resource scheduler (SDRS) has been introduced in vSphere 5. More details about its features and usage can be found in the Balancing loads between datastores recipe in this chapter.

SDRS load balancing constantly monitors datastore space utilization and I/O latency. When one of the configured thresholds for these metrics is exceeded on a particular datastore, SDRS calculates the possible options for VM storage migrations and recommends the one that offers the best load distribution.

Note

The default threshold for space utilization is 80 percent. The default value for I/O latency round trip is 15 milliseconds. Both thresholds can be changed. While the I/O latency threshold can be disabled, ...

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