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I guess I'm not surprised that the auditors cause an undesierable amount of IO load w/o turning. But in a healthy cluster I wouldn't expect the replicators to be doing enough work to pin the object server's into a timeout?

What io scheduler are you using (i.e. /sys/block/*/queue/scheduler)? I'd recommend probably... deadline?

There's lots of ways to do more IO shaping, maybe isolating sqlite/container work-load to separate drives/devices/servers, more RAM in storage nodes, tuning vfs_cache_presure or io scheduler, and in the end maybe we need to add some tunable for replication (something based on job/suffix in the main replicate loop?).