> I'd like to use a linux-based NAS to backup loads of files *including
> their permissions and uid/gid*. The NAS supports NFS (which can do
> what I want) but the NFS-connections breaks all the time.
This is a strangely common question recently. I'll paste here, the response I
wrote in some other message.
If you're having NFS reliability problems, it's due to misconfigured NFS.
Below is the config that I deploy to all the locations where I do their IT,
because after zillions of hours of manual reading, testing and usage - it's a
tried & tested rock solid config for linux-to-linux nfs filesharing.
Assuming you're on Linux, I'll suggest the following NFS options in your
exports file, and then I think I better butt-out, because this is a samba
mailing list:
man exports
# On a server that has a caching raid controller card, you want
sync,no_wdelay
# On a server that has a simple disk, you want async (no_wdelay has no
effect, so you can omit it.)
/share 10.1.100.0/23(sync,no_wdelay,rw,no_root_squash)
And I'll suggest the following options on the nfs client:
Use automount. Assuming automount 5 you can use auto.direct as below,
otherwise create an automount directory as expected in automount 4.
/etc/auto.master
/- /etc/auto.direct --timeout=1200
/etc/auto.direct
/share -fstype=nfs,rw,hard,intr,posix fileserver:/share
If you take my advice here, you'll have a NFS hard mount on the client
(therefore resilient) combined with interruptable auto dismount (therefore self
healing).
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