Hi I've been trying to Google about Bluestore compression. But most articles I find are quite old and are from Ceph versions where zstd compression level was hardcoded to 5. I've been thinking about enabling zstd compression with a ` compressor_zstd_level` of "-1" in most of my pools. Any thoughts? Is there any one that has any recent benchmarks of this? zstd compression with a normal server CPU should be faster than HDD writes. And decompression should also be faster than any HDD reads. I don't know about NVMe drives, there a lot of disks have faster write speed than it takes the CPU to compress data, but also if the compression ratio is good, you have less data to write. And when it comes to reads I guess it would depend on the NVMe disk and the CPU you got. Also I've been wondering about the pro's and con's when it comes to compression. I guess that some pro's would be - Less data to scrub (since less data are stored on the drives) - Less network traffic (replicas and such, I guess it depends on where the compression takes place)? - Less wear and tear on the drives(since less data are written and read) Also I wonder, where does the compression take place? A con would be if it is slower, but I guess this might be depending on which CPU, drives and storage controller you use, also what data you write/read. But it would be nice with a fresh benchmark. This would be especially interesting since this PR was merged https://github.com/ceph/ceph/pull/33790 which changed the default compression level to 1 and allows you to set your own compression level for zstd. /Elias _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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