[mythtv-users] Shared filesystem that looks different to different machines
Raymond Wagner
raymond at wagnerrp.com
Wed Jun 4 23:21:14 UTC 2014
On 6/4/2014 1:40 PM, Joseph Fry wrote:
>
> I don't believe that NFS would have any issue with nesting a
> mount inside another mount like this, after all the OS just
> treats it as another filesystem and every linux system I
> have ever seen does this (/dev, /proc, etc).
>
>
> NFS can have issues if you mount one NFS volume within another
> NFS volume. If access to the lower volume is ever anything but
> 100% stable, and the mount point for the upper volume is lost,
> bad things happen. It's the same reason why you never use an
> NFS share for swap space.
>
>
> Mounting one NFS filesystem on another NFS filesystem has been
> commonly used from the beginning of NFS: diskless systems did this
> all the time.
>
>
> I could see problems like Raymond describes if it were two different NFS
> servers and you were nesting... but on the same server, I'd imagine that
> if one went, the other would as well anyway.
I've had issues even when using only one NFS server. The mountpoint
basically becomes a black hole. Any process that tries to touch that
branch of the filesystem is irrecoverably blocked (SIGKILL can't even
touch them), and the system can only be fixed by a reboot.
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