The NAS is not mounted permanently only on demand for daily backups and via cifs.
I use the redis server for my owncloud. The owncloud data dir is symlinked to an attached ssd connected via usb. I thought that the issue maybe comes from there but couldn’t find anything.
❯ cat /etc/mtab
/dev/root / ext4 rw,lazytime,noatime 0 0
devtmpfs /dev devtmpfs rw,relatime,size=1897628k,nr_inodes=474407,mode=755 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,nodev,size=772992k,nr_inodes=819200,mode=755 0 0
tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
bpf /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=30,pgrp=1,timeout=0,minproto=5,maxproto=5,direct 0 0
mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0
tracefs /sys/kernel/tracing tracefs rw,nosuid,nodev,noexec,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,nosuid,nodev,noexec,relatime 0 0
sunrpc /run/rpc_pipefs rpc_pipefs rw,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0
configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0
nfsd /proc/fs/nfsd nfsd rw,relatime 0 0
systemd-1 /mnt/usb autofs rw,relatime,fd=52,pgrp=1,timeout=0,minproto=5,maxproto=5,direct 0 0
/dev/mmcblk0p1 /boot vfat rw,lazytime,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro 0 0
/dev/sda3 /mnt/usb ext4 rw,lazytime,noatime 0 0
tmpfs /tmp tmpfs rw,lazytime,nosuid,nodev,noatime,size=1048576k 0 0
tmpfs /run/user/1001 tmpfs rw,nosuid,nodev,relatime,size=386492k,nr_inodes=96623,mode=700,uid=1001,gid=1001 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,nosuid,nodev,noexec,relatime 0 0