Readynas 104 - Very slow, almost unusable

Hi Richard-P 

Thanks for the logs.

Your unit is running into an "out of memory" condition over and over, every 10-20 mins. This is obviously a problem. The odd thing is, that this seems related to clam-av (the antivirus service), which was disabled on the RN100 series a while back.

Mar 28 12:50:34 ReadyNAS kernel: Out of memory: Kill process 4975 (clamd) score 1411 or sacrifice child
Mar 28 12:50:34 ReadyNAS kernel: Killed process 4975 (clamd) total-vm:691048kB, anon-rss:210748kB, file-rss:436kB
Mar 28 13:07:08 ReadyNAS kernel: enclosure_monit invoked oom-killer: gfp_mask=0x24201ca, order=0, oom_score_adj=-1000
Mar 28 13:07:09 ReadyNAS kernel: enclosure_monit cpuset=/ mems_allowed=0
Mar 28 13:07:09 ReadyNAS kernel: CPU: 0 PID: 2524 Comm: enclosure_monit Tainted: P O 4.4.190.armada.1 #1
Mar 28 13:07:09 ReadyNAS kernel: Hardware name: Marvell Armada 370/XP (Device Tree)
Mar 28 13:07:09 ReadyNAS kernel: [<c0015270>] (unwind_backtrace) from [<c001173c>] (show_stack+0x10/0x18)
Mar 28 13:07:09 ReadyNAS kernel: [<c001173c>] (show_stack) from [<c03849d0>] (dump_stack+0x78/0x9c)
Mar 28 13:07:09 ReadyNAS kernel: [<c03849d0>] (dump_stack) from [<c00d5e20>] (dump_header+0x4c/0x1b4)
Mar 28 13:07:09 ReadyNAS kernel: [<c00d5e20>] (dump_header) from [<c00a09a0>] (oom_kill_process+0xd0/0x45c)
Mar 28 13:07:09 ReadyNAS kernel: [<c00a09a0>] (oom_kill_process) from [<c00a10b0>] (out_of_memory+0x310/0x374)
Mar 28 13:07:09 ReadyNAS kernel: [<c00a10b0>] (out_of_memory) from [<c00a49d4>] (__alloc_pages_nodemask+0x6e0/0x7dc)
Mar 28 13:07:09 ReadyNAS kernel: [<c00a49d4>] (__alloc_pages_nodemask) from [<c009faa4>] (filemap_fault+0x344/0x464)
Mar 28 13:07:09 ReadyNAS kernel: [<c009faa4>] (filemap_fault) from [<c01548a0>] (ext4_filemap_fault+0x2c/0x44)
Mar 28 13:07:09 ReadyNAS kernel: [<c01548a0>] (ext4_filemap_fault) from [<c00ba4c4>] (__do_fault+0x60/0xdc)
Mar 28 13:07:09 ReadyNAS kernel: [<c00ba4c4>] (__do_fault) from [<c00bd1a0>] (handle_mm_fault+0x4e0/0xc04)
Mar 28 13:07:09 ReadyNAS kernel: [<c00bd1a0>] (handle_mm_fault) from [<c0017cb8>] (do_page_fault+0x134/0x2b0)
Mar 28 13:07:09 ReadyNAS kernel: [<c0017cb8>] (do_page_fault) from [<c0009368>] (do_PrefetchAbort+0x34/0x9c)
Mar 28 13:07:09 ReadyNAS kernel: [<c0009368>] (do_PrefetchAbort) from [<c00125dc>] (ret_from_exception+0x0/0x24)
Mar 28 13:07:09 ReadyNAS kernel: Exception stack(0xdb277fb0 to 0xdb277ff8)

This service shouldn't even appear in the processes list, but it does.

S root 3471 1 3471 0 1 80 0 8 2601 pipe_w 04:17 ? 00:00:14 /usr/bin/freshclam --quiet
D root 3477 3471 3477 2 1 80 0 64756 175427 wait_o 04:18 ? 00:08:42 /usr/bin/freshclam --quiet
R root 8502 1 8502 14 1 98 18 230996 158682 - 11:16 ? 00:02:26 /usr/sbin/clamd --foreground=true --config-file=/etc/clamav/clamd.conf

It is enabled on your NAS, in the default services list:

ANTIVIRUS=1
ANTIVIRUS_SCHE_SCAN=0

Something is amiss with this. I don't get how the clam daemon is running at this point, unless you started it yourself? Do you use SSH and command line (CLI) on this NAS? You are on 6.10.4 and have been updating regularly:

[2019/07/13 15:10:30 UTC] Updated from ReadyNASOS 6.10.0 (ReadyNASOS) to 6.10.1 (ReadyNASOS).
[2020/03/07 09:06:53 UTC] Updated from ReadyNASOS 6.10.1 (ReadyNASOS) to 6.10.2 (ReadyNASOS).
[2020/03/18 08:02:56 UTC] Updated from ReadyNASOS 6.10.2 (ReadyNASOS) to 6.10.3 (ReadyNASOS).
[2020/12/19 09:37:52 UTC] Updated from ReadyNASOS 6.10.3 (ReadyNASOS) to 6.10.4 (ReadyNASOS).
[2021/01/03 14:22:58 UTC] Updated from ReadyNASOS 6.10.4 (ReadyNASOS) to 6.10.4 (ReadyNASOS).
[2021/03/27 09:26:47 UTC] Updated from ReadyNASOS 6.10.4 (ReadyNASOS) to 6.10.4 (ReadyNASOS).

Netgear disabled the AV service on the RN100 series NAS, due to resource and performance issues and I think that happened around 6.10.0. So... how your AV service is running, I don't know :) But that is your performance problem right there. You need to disable that AV service. You can do it from the CLI:

systemctl stop clamav-daemon

Check it is stopped:

systemctl status clamav-daemon

You also need to turn it off in the /etc/default/services file (set it to "0"), so that it will not start again upon next NAS reboot.

Do you know how to access the NAS CLI over SSH, in order to fix this?

Cheers