[[6.7.x] Very slow array concurrent performance]

I'm also experiencing this in mc just copying files from array to array. Does the same thing as mover, locks up and maxes CPU, even mc transfer freezes up every 5 seconds or so and pauses for a few seconds. 

[[6.7.x] Very slow array concurrent performance]

Hey. I've been having similar issues from day dot of cache addition, but I only recently purchased Unraid and have started with 6.7. My system becomes unusable while mover is running. any transfers slow to nearly nothing, in some ftp cases time out completely and fail. I run Shinobi as a docker with a CCTV system on 24h recordings and I'm getting recording black spots during mover scheduled time. I troubleshooted this a bit myself by moving the cache disks off the mobo sata ports and onto the raid card sas sata ports on my raid card with the rest of the array disks thinking it might be unnecessary io cpu power to route it via the motherboard and instead keep it to the pci-e slot/raid card io. It did improve by actually having some sort of recording happening instead of nothing or 0 byte files being written, but the normally 15minute blocks of recordings are still being interrupted and split into various chunks of that 15minute block with missing minutes still. It also kills any gui communication while mover is running. I can't see much in the terms of mover settings for troubleshooting this but a speed limit or something might be good? I'm a bit of a layman with this stuff so I don't understand what's suggested in above posts. Just thought I'd post my issues on this subject too. 

 

Edit: Maybe an important note is I run two parity disk array with two ssd disks in a cache pool. (so maybe higher then standard cpu requirement by Unraid for mover)