Comments (4)
Matthew, thanks for taking the time to explain how you perform asynchronous replication at scale. You've given me food for thought.
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Matthew's good suggestion is not a workaround for us. We replicate to a data center 1400 km away (27 ms RTT), The time overhead of a single irepl call is 1-2 s. We typically replicate 20 - 30 TiB per week of files with sizes ranging from 0 B - 1 TiB with a median of ~20 kiB, so we primarily replicate smalll files. For a few hundred thousand small files, passing only one file at a time to irepl would add several days to the time it takes to replicate the data. We currently bin our files by size. For files under 100 MiB, we make 16 irepl calls in parallel passing in 512 files per call, as file size increases, we reduce the number of files passed to each irepl, and we reduce the number of irepl calls made at time. Over 100 MiB, multi-threaded transfer kicks in. We try to keep the total number of transfer threads to at least 16. We can usually complete a weeks worth of replication in 2 - 3 days.
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