[solved] NFS: "ls: reading directory .: Input/output error" after time

Hello,
I got the following configuration:
NFS-server: Always on, connected via LAN.
NFS-clients: 2 computers, connected via LAN and WLAN. On standby: auto umount NFS-share via system-sleep-hook with systemd.
This works flawlessly some hours or even days. But after some time, the following happens:
1. mount nfs-share: no error message
2a. trying to access that folder via filemanager, e.g. thunar: folder seems to be empty (it isn't on server!), but the correct freesize of the NFS-share on server is displayed in the statusbar.
2b. trying to access that folder via commandline:
$ ls
ls: reading directory .: Input/output error
The very same worked just a few hours before, I haven't changed anything meanwhile. Apart from standby (--> auto umount NFS-share) and resume (manual mount NFS-share) on the clients which worked before, too.
Any idea what's going wrong?
additional info:
server:
/etc/exports
/srv/nfs/myshare 192.168.2.0/24(rw,all_squash,anonuid=33,anongid=33,no_subtree_check)
(yes, the mapping is needed and right.)
clients:
/etc/fstab
servername:/srv/nfs/myshare /home/carl/nfs nfs4 noauto,soft,user,_netdev,timeo=14,rsize=8192,wsize=8192 0 0
/usr/lib/systemd/system-sleep/umount-nfs
#!/bin/sh
case $1 in
pre)
umount -f /home/carl/nfs
esac
Last edited by Carl Karl (2014-09-21 17:07:47)

Indeed, there could be something interesting in dmesg on the server:
[ 4.190117] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
[ 4.190596] NFSD: starting 90-second grace period (net ffffffff818a9540)
[ 5.445237] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off
[ 5.895519] r8169 0000:04:00.0 enp4s0: link up
[ 5.895529] IPv6: ADDRCONF(NETDEV_CHANGE): enp4s0: link becomes ready
[72346.265850] usb 3-1: USB disconnect, device number 2
[72346.670926] usb 3-1: new SuperSpeed USB device number 3 using xhci_hcd
[72346.684585] usb-storage 3-1:1.0: USB Mass Storage device detected
[72346.684716] scsi5 : usb-storage 3-1:1.0
[72347.686518] scsi 5:0:0:0: Direct-Access WD Elements 1048 1022 PQ: 0 ANSI: 6
[72347.687606] sd 5:0:0:0: [sdc] 976769024 512-byte logical blocks: (500 GB/465 GiB)
[72347.690295] sd 5:0:0:0: [sdc] Write Protect is off
[72347.690301] sd 5:0:0:0: [sdc] Mode Sense: 47 00 10 08
[72347.692981] sd 5:0:0:0: [sdc] No Caching mode page found
[72347.693025] sd 5:0:0:0: [sdc] Assuming drive cache: write through
[72348.135398] sdc: sdc1
[72348.141458] sd 5:0:0:0: [sdc] Attached SCSI disk
[72348.455737] EXT4-fs (sdc1): recovery complete
[72348.455919] EXT4-fs (sdc1): mounted filesystem with ordered data mode. Opts: (null)
[74276.020331] EXT4-fs error (device sda1): ext4_find_entry:1310: inode #14024711: comm nfsd: reading directory lblock 0
[74276.021107] EXT4-fs error (device sda1): ext4_find_entry:1310: inode #14024711: comm nfsd: reading directory lblock 0
(last one repeats several times...)
Indeed, the NFS-share resists on a external WD harddrive connected via USB, /dev/sdc1.
As suggested in the NFS wiki article, the NFS-share is a bind-mount:
/etc/fstab on server:
# fake-root for NFS
/magnet/owncloud/data/carl/files /srv/nfs/myshare none bind,noauto,x-systemd.automount
while /srv is on /dev/sda1.
The external harddrive has an auto-standby (NOT hdparm...) which isn't causing troubles with other services.
So it seems to be a problem connected to this bind-mount to external USB setup....
I'll try to find out whether there is  a way to avoid that.
Thanks so far!
Last edited by Carl Karl (2014-09-16 14:30:02)

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    The hard drive enclosure that I have has 2 bays for two SATA drives. I have used this enclosure without any problems until I tried to get 1 drive to act as the backup drive for Time Machine and the other to be storage. I formatted them using Drive Genius. I used the option for GUILD or GUIL which it said was the better format for using with Time Machine.
    The first problem I ran into since reformatting the drives is I got an "input/output" error the first couple times I connected the drive via USB to my Mac. I could still use the drives but I got weird errors every once in a while like "input/output error" or "device was not ejected properly" even though the device had not been unplugged.
    Now the drives will not mount using OS 10.5.5. The drives show up when I open Disk Utility, but I cannot get them to mount. I have ran Disk Utility First Aid, and it says the drives are fine. There is one error that shows up when I run the "Repair Disk" feature. It reads "Invalid content in Journal". But Disk Utility also says "The volume was repaired successfully".
    I have seen some posts when I do a search in google about this issue and it seems this is a known issue. Every suggestion I see says to insert your Tiger DVD and reformat the drive using that and the problem will be solved. The only problem with that is I have a lot of important files on the drive that I cannot lose. I had the files backed up until I moved them to the new drive a while back. Now I do not have a backup because I was in the process of switching to bigger drives and erased the old drives after doing so because everything was working fine.
    I am hoping someone out there may have some suggestions (other than erasing the drive) to get my dives to mount so I can transfer the data off to another drive and reformat after.
    Thanks,
    Paul Rugg

    I have similar problems with my USB external HD. Reformatting or repartitioning will not solve your problem. I've tried that 2 times already. The problem will reappear. My HD was running great until last month, when it suddenly without warning disappears from disk utility and the mac altogether. It not only dismounts itself, but also ejects itself, while still physically connected and the power is still on. The HD has its own power supply of course and is directly connected to one of the iMac USB ports. I have erased, repartitioned, disk verified, rebuild spotlight indexes, cleared PRAM and NVRAM, but nothing has solved the problem.
    It is application independent, and not related to like iTunes as another post had suggested. Nothing to do with Mac applications. It seems to be USB related.
    Messages in the Console seem to indicate something wrong with 'USB transactions passed their expiration point' and 'USB cannot enumerate something', but these statements are a bit cryptic to me. Perhaps an Apple system engineer can someday shed some light here.
    thanks much for any assistance.

  • Error loading BASIC document. General Error. General input/output error".

    Error loading BASIC document. General Error. General input/output error".

    I guess your problem is related to StarOffice8, right?
    I had the same issue after upgrading StarOffice7 to StarOffice8:
    http://forum.java.sun.com/thread.jspa?threadID=5287604&tstart=0
    Apparently the .StarOffice8 directory in your export/home directory was created based on .StarOffice7
    directory. Probably here something went wrong. Maybe a bug.
    So the solution is very simple:
    rm -r .StarOffice8 in your export/home directory and restart StarOffice8.
    Or you can also rename the directory.

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