Cached NFS-shares are not permanently mountable!

[theuema]

I ran into an issue recently, when trying to mount a SSD cached share on my Enigma2 Linux receiver permanently, to store my recordings directly onto my unraid server!

 

I use fstab to mount the share (just added nfsvers=4 while investigating the error; not needed):

192.168.178.60:/mnt/user/recordings /media/recordings nfs _netdev,nfsvers=4,rw 0 0

 

It works till the mover moves the recordings from SSD cache pool into the array.

After that i get the following errors on the fstab-mounted nfs share on my receiver:

 

root@dreambox:~$ mount -t nfs 192.168.178.60:/mnt/user/recordings /media/recordings
mount.nfs: Stale file handle

root@dreambox:~$ rpcinfo -p 192.168.178.60
   program vers proto   port  service
    100000    4   tcp    111  portmapper
    100000    3   tcp    111  portmapper
    100000    2   tcp    111  portmapper
    100000    4   udp    111  portmapper
    100000    3   udp    111  portmapper
    100000    2   udp    111  portmapper
    100024    1   udp  34064  status
    100024    1   tcp  47303  status
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100021    1   udp  49947  nlockmgr
    100021    3   udp  49947  nlockmgr
    100021    4   udp  49947  nlockmgr
    100021    1   tcp  41379  nlockmgr
    100021    3   tcp  41379  nlockmgr
    100021    4   tcp  41379  nlockmgr
    100005    1   udp  60889  mountd
    100005    1   tcp  50843  mountd
    100005    2   udp  33420  mountd
    100005    2   tcp  55269  mountd
    100005    3   udp  59744  mountd
    100005    3   tcp  55475  mountd
    
root@dreambox:~$ showmount -e 192.168.178.60
Export list for 192.168.178.60:
/mnt/user/media       *
/mnt/user/recordings   *

root@dreambox:~$ ls -l /media/recordings
ls: /media/recordings: Stale file handle

root@dreambox:~$ showmount -a
clnt_create: RPC: Program not registered

root@dreambox:/media$ cat /proc/mounts | grep nfs
nfsd /proc/fs/nfsd nfsd rw,relatime 0 0
192.168.178.60:/mnt/user/recordings /media/recordings nfs4 rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.178.70,local_lock=none,addr=192.168.178.60 0 0

 

AFAIK, this can be solved by un-exporting and re-exporting the relevant exports on the server:

 

exportfs -ua
exportfs -a

 

and afterwards manually mounting the nfs share on the receiver, mount -t nfs ...

 

But, idk how to schedule this?

E.g.: I have several docker containers running, but the mover moves, although I never put them down.

I set the daily mover schedule to 05:45, but realized that the other day the mover moved my recordings somewhere around 17:00 (maybe even 17:45 - but there is no AM/PM setting? Therefore, i think this is just a coincidence.).

So i can't schedule a cron job for manual mounting my recordings share -> NFS-Shares that must be permanently mounted can not be cached!

 

When deactivating the SSD-Cache and directly using the HDD within my Array it seems to work.

 

Would appreciate the cached solution though.

Edited February 20, 2023 by theuema