Network filesystem timeout settings
Network disruptions are always happening, network filesystems on different OS have different behaviors.
NFS
During Synology disk migration and SSD cache reconfiguration, my Fedora 34 on iSCSI mounted NFS disk kept hanging, I checked the default NFS mount options, then found that it was using hard option with out intr as below,
192.168.1.10:/volume1/kvm on /kvm type nfs4 (rw,nosuid,nodev,noexec,relatime,vers=4.1,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.1.9,local_lock=none,addr=192.168.1.10)I think maybe this is giving the factor of hanging.
iSCSI
After I changed NFS setting to soft, I suddenly realized that my iSCSI used by Fedora OS might not able to handle interupt as well, not sure whether iSCSI got similar options.
Samba on MacOS
My MacOS also got issue on samba filesystem, always disconnected after communication dropped, but my Windows machine has no such issue.