The check for flash cache performance (FlashCache ) will receive three additional counters in the next release (3.3.0):
- disk_reads_replaced: Estimated number of disk reads per second replaced by cache
- evicts: Number of blocks evicted from the external cache to make room for new blocks
- evicts_ref: Number of blocks evicted from the external cache that were used once or more.
The evict counter shows blocks flushed out of the cache, which is interesting as you can determine if your flashcache is too small on the number of evicts and inserts.
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