rt_merge_iops

rt_merge_iops

A maximum number of I/O operations (per second) that the RT chunks merge thread is allowed to start. Optional, default is 0 (no limit). Added in 2.1.1-beta.

This directive lets you throttle down the I/O impact arising from the OPTIMIZE statements. It is guaranteed that all the RT optimization activity will not generate more disk iops (I/Os per second) than the configured limit. Modern SATA drives can perform up to around 100 I/O operations per second, and limiting rt_merge_iops can reduce search performance degradation caused by merging.

Example:

rt_merge_iops = 40
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