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From tests I run with RocksDB 8.7 and 8.8 what I see with rareq-sz from iostat is many small reads (block sized) from compaction when compaction_readahead_size is larger than /sys/block/$device/queue/max_sectors_kb. Reducing compaction_readahead_size resolves the problem. I assume it should be smaller than max_sectors_kb+rocksdb_block_size or some other fudge factor because the readahead requested can be slightly larger than compaction_readahead_size.
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