When choosing a new memory reservation value (**maxmemory-reserved** or **maxfragmentationmemory-reserved**), consider how this change might affect a cache that is already running with large amounts of data in it. For instance, if you have a 53-GB cache with 49 GB of data, then change the reservation value to 8 GB, this change drops the max available memory for the system down to 45 GB. If either your current `used_memory` or your `used_memory_rss` values are higher than the new limit of 45 GB, then the system will have to evict data until both `used_memory` and `used_memory_rss` are below 45 GB. Eviction can increase server load and memory fragmentation. For more information on cache metrics such as `used_memory` and `used_memory_rss`, see [Create your own metrics](cache-how-to-monitor.md#create-your-own-metrics).
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