Document cached_read_{data,meta,journal} parameters
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@@ -213,4 +213,5 @@ have enough RAM for the default 4 KB csum_block_size.
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Option 3 is recommended for SSD+HDD setups (because metadata SSDs will handle
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extra reads without any performance drop) and also *maybe* for NVMe all-flash
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setups when you don't have enough RAM (because NVMe drives have plenty
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of read iops to spare).
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of read iops to spare). You may also consider enabling
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[cached_read_meta](osd.en.md#cached_read_meta) in this case.
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