Relationship between Lazy Filewalker and piece-scan-on-startup, explanations of settings

[Alexey]

@ad329

I was wondering why this is the case, what the behavior difference is between lazy-filewalker being on or off? I was thinking its only controlling the IO priority of the file walker process, there are no other differences?

What is Your IOPS with no ingress but during filewalking?

People are greatly misunderstanding how IO priorities work. I’ve explained it before, but I’ll have another go. Normal filewalker: “Gimme gimme gimme gimme!!!”. Uses up all of the disk’s IOPS, numbers go up => it must be great!. No IOPS left for the actual storagenode => lower ingress => less stored data. Your disk simply isn’t fast enough and loses races. Lazy filewalker: “Can I please read some data from the disk?” Host system prioritizes from high priority (actual storagenode process) to lo…