OliverRC Posted May 19, 2019 Share Posted May 19, 2019 (edited) I have been running unRaid for a short time and recently done the update too 6.7.0. Unfortunately almost once a day the system seems to freak out and go to 100% CPU and 100% RAM. Only a reboot seems to sort it out. It will then run find for a few hours before starting again. Specs (From System Profiler): unRAID system:unRAID server Plus, version 6.7.0 Model:Custom Motherboard:Gigabyte Technology Co., Ltd. - H67M-D2-B3 Processor:Intel® Core™ i3-2100 CPU @ 3.1 GHz HVM:Enabled IOMMU:Disabled Cache:Internal Cache = 64 kB (max. capacity 64 kB) External Cache = 3072 kB (max. capacity 2048 kB) Memory:4 GB (max. installable capacity 32 GB) A0 = 2048 MB, 1333 MT/s A2 = 2048 MB, 1333 MT/s Network:bond0: fault-tolerance (active-backup), mtu 1500 eth0: 1000Mb/s, full duplex, mtu 1500 Kernel:Linux 4.19.41-Unraid x86_64 OpenSSL:1.1.1b P + Q algorithm:8949 MB/s + 13062 MB/s Uptime:0 days, 19 hours, 27 minutes, 53 seconds The dashboard shows 100% CPU across all cores and 100% (99% RAM) Oddly the Dynamix System Stats plugin only shows 15% CPU Usage I ran "top" in the terminal and this is the output %Cpu(s): 0.3 us, 12.1 sy, 0.0 ni, 0.1 id, 85.1 wa, 0.0 hi, 2.4 si, 0.0 st MiB Mem : 3866.2 total, 202.4 free, 3007.4 used, 656.4 buff/cache MiB Swap: 0.0 total, 0.0 free, 0.0 used. 25.7 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3614 root 20 0 0 0 0 R 16.9 0.0 24:46.13 unraidd 3894 root 0 -20 0 0 0 D 10.3 0.0 3:29.14 loop2 586 root 20 0 0 0 0 S 5.6 0.0 6:37.58 kswapd0 2732 root 20 0 0 0 0 I 5.0 0.0 0:17.00 kworker/u16:0-btrfs-endio 13752 root 20 0 0 0 0 I 2.3 0.0 0:37.84 kworker/u16:7-btrfs-endio 5321 nobody 20 0 2527920 427988 4 S 2.0 10.8 7:40.29 Plex Media Serv 4410 root 20 0 0 0 0 I 1.7 0.0 0:25.73 kworker/u16:11-btrfs-endio 17537 root 20 0 0 0 0 I 1.7 0.0 0:32.31 kworker/u16:1-btrfs-endio 23464 root 20 0 0 0 0 I 1.7 0.0 0:32.55 kworker/u16:3-btrfs-endio 5469 nobody 20 0 1884424 121616 4 S 1.0 3.1 2:30.94 mono 5990 nobody 20 0 2370020 192732 4 S 1.0 4.9 2:34.85 mono 6119 nobody 20 0 4049524 1.8g 0 S 0.7 48.5 10:53.89 Plex DLNA Serve 29387 root 20 0 0 0 0 I 0.7 0.0 0:39.92 kworker/u16:10-btrfs-endio 1206 root 0 -20 0 0 0 I 0.3 0.0 0:02.14 kworker/3:1H-kblockd 3447 root 20 0 281516 3580 2892 S 0.3 0.1 3:12.59 emhttpd 3798 root 20 0 1024204 22248 812 S 0.3 0.6 31:27.85 shfs 5775 nobody 20 0 1760460 46560 0 S 0.3 1.2 1:54.39 sabnzbdplus 6021 nobody 35 15 1710952 43756 0 S 0.3 1.1 1:21.96 Plex Script Hos 6610 nobody 20 0 301592 63836 0 D 0.3 1.6 0:11.73 Plex Media Scan 10845 root 20 0 8784 3240 2348 R 0.3 0.1 0:00.03 top 1 root 20 0 2460 1600 1500 S 0.0 0.0 0:10.33 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd 3 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_gp 4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_par_gp 6 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker/0:0H-kblockd 8 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 mm_percpu_wq 9 root 20 0 0 0 0 S 0.0 0.0 0:01.44 ksoftirqd/0 10 root 20 0 0 0 0 I 0.0 0.0 0:24.20 rcu_sched 11 root 20 0 0 0 0 I 0.0 0.0 0:00.00 rcu_bh 12 root rt 0 0 0 0 S 0.0 0.0 0:00.04 migration/0 13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuhp/0 14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuhp/1 15 root rt 0 0 0 0 S 0.0 0.0 0:00.03 migration/1 16 root 20 0 0 0 0 S 0.0 0.0 0:01.78 ksoftirqd/1 I use the server for files and Sonarr, SABnzbd, Radarr and Plex. I know RAM @ 4GB is on the low side but I ran this setup on Windows 10 before and it was fine, I can't imagine unRaid needing more RAM then that although I plan on upping to 8GB. I've uploaded a diagnostics dumpy of when this happened. oliver-server-diagnostics-20190519-1207.zip Edited May 19, 2019 by OliverRC Quote Link to comment
Squid Posted May 19, 2019 Share Posted May 19, 2019 85.1 wa, 85% cpu waiting for I/O. The dashboard takes this into consideration. With whatever is happening at the time this goes on, it's because you're running into bottlenecks Quote Link to comment
OliverRC Posted May 19, 2019 Author Share Posted May 19, 2019 Thanks for the response, during this time I was watching something on Plex (1080p). I am quite new to unraid, what do you think the bottleneck/root cause is? If it is waiting for I/O I assume this could be a case of the array being to slow to serve the video? That would be odd as I've had this hardware on a Windows setup and been able to run Ultra HD playback with no issue. It shouldn't be that demanding on disc reads to playback a 1080p movie. Quote Link to comment
OliverRC Posted June 2, 2019 Author Share Posted June 2, 2019 I upgraded to 8GB of RAM and no dice. It looks like DLNA Server in Plex is eating up a huge amount of RAM. Then at some point the system freaks out and goes into page swapping madness and kills the CPU and RAM maxing them out to 100%. I understand what is going on here. top command Quote Link to comment
chris_netsmart Posted October 25, 2019 Share Posted October 25, 2019 I have the same issue and it drivers me mad, as in the morning the ram is around 25mb and then during the day / evening the ram raises to 100% and the next thing i know i, plex has hanged. I also like to know of there is a way to provent the ram raising to 100% Quote Link to comment
OliverRC Posted October 28, 2019 Author Share Posted October 28, 2019 (edited) @chris_netsmart I have been running now for a while since this post after disabling the DLNA server, with no issues. It looks like there might have been an issue with it. I've not needed to re-enable it so cannot confirm if updates have resolved it. Edited October 28, 2019 by OliverRC 1 Quote Link to comment
chris_netsmart Posted October 28, 2019 Share Posted October 28, 2019 (edited) @oliverRC. Thanks for the info about DLNA services. The funny things is that i turned this off myself last night. I will also update the call in a few days, if all is ok. Update. I can also confirm that after turning off the DLNA services, my plex now only use 25% of my RAM and has not craahed one this week. Edited November 2, 2019 by chris_netsmart Progress on DLNA issue Quote Link to comment
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