June 11, 201511 yr Something is happening where if I'm copying a file via ssh, the disk speed will go to a crawl for 5-10 minutes, then speed up again like nothing happened. It also brings down the disk speed of my VMs/docker somehow. If I CTRL-C out of the rsync command I ran, it returns back to normal in a few seconds. I'm literally just bulk copying files around my disk array, and its usually fine, but is there some way I can find out what's behind this AWESOME slowdown that happens?
June 11, 201511 yr Author Recently upgraded to rc5, though this issue was present before upgrade. Report attached! edit: Just to clarify, the speed goes from 100+mb/s, to 20kb/s. Which in comparison is less than a snails pace Would love any help to diagnose what could be happening. tower-diagnostics-20150610-2223.zip
June 11, 201511 yr Community Expert Diagnostics missing smart for any of your hdds. Syslog has a lot of errors from your plugins, don't know if that's normal or not. Also says your cache drive is full, so that may be the problem.
June 11, 201511 yr Author Diagnostics missing smart for any of your hdds. HDDs are connected through RAID card, probably why? Also says your cache drive is full, so that may be the problem. I opened another thread for that, it looks like my second drive in the pool either isn't getting used or is showing wrong size info.
June 11, 201511 yr Community Expert Looks like you have a cache pool with a 250GB and a 120GB. This means you only have 120GB usable. btrfs disk usage calculator
June 12, 201511 yr Author Disk usage on cache lists about 33% full. Semi-doubt its because disk space but interesting theory.
June 12, 201511 yr Community Expert Disk usage on cache lists about 33% full. Semi-doubt its because disk space but interesting theory. How much space does it say is used, not in percentage but in GB? Jun 10 20:16:01 Tower shfs/user: cache disk full
June 12, 201511 yr Community Expert Must be something wrong with your cache pool, corruption or something. 173G is definitely the wrong total. Should only be 120 on one disk and 120 mirrored on the other disk, so only 120 total.
June 12, 201511 yr Community Expert I think there were some similar reports a few months ago when people filled up their docker img. In Settings - Docker, what do you have under Docker volume info?
June 12, 201511 yr Author I think there were some similar reports a few months ago when people filled up their docker img. In Settings - Docker, what do you have under Docker volume info? Label: none uuid: 6ab55325-6270-4669-a887-3da715f2bfc1 Total devices 1 FS bytes used 295.03MiB devid 1 size 10.00GiB used 3.04GiB path /dev/loop0 btrfs-progs v4.0.1 seems fine
June 12, 201511 yr Community Expert From Main, click on the cache drive (not cache2). On the Cache Settings page, turn on Help. Scroll down and read the help under Scrub and click the button.
June 12, 201511 yr Author Scrub came back with 0 errors scrub status for df489f54-c8eb-48e1-b5a9-54440fc6fa92 scrub started at Fri Jun 12 18:10:38 2015 and finished after 37 seconds total bytes scrubbed: 31.73GiB with 0 errors
June 13, 201511 yr Author Tried it, same result. I'm gonna switch it to just my 256gb SSD instead of the 2 and see what happens
June 14, 201511 yr Author Minor update: Appears to happen with only 1 cache drive (reformatted) as well. I'm noticing that the next drive in sequence never gets spun up even though the current drive is half full (share is set to high water). Maybe this is where it gets hung up? Though I guess if its just writing to itself (the cache drive) until the mover hits, this doesn't seem likely. Attempting to have all drives spinning to see if I can replicate.
June 15, 201511 yr Author Update 2: I just got a "heat warning" for my cache SSD, says its running at 45C. I guess this could be it too? This SSD used to run 5-6 VMs at one point with no problem so I sort of doubt it unless docker/plugins are doing something weird. Edit: Nvm it just went back to 27C
June 15, 201511 yr Author Bumping It appears to occur when I write to the cache/SSD, I was copying some files off an external drive to my array and the slowdown/crawl occured. BUT, READING from the drive or writing at a low (under 1mb/s) speed seems to not cause it to occur. Wondering I should format from btrfs to xfs on the cache and see if I get similar results?
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