Re: re-export NFS mounted disk to be NFS mounted?

[Yuri Csapo <ycsapo@mines.edu>]

AFAIK that is not possible on Linux with the stock kernel nfs server. It 
*should*  be possible with the userspace server, but I'm not sure it's 
supported. Maybe someone who has actually done it (as opposed to playing 
with it) should comment.

OTOH it doesn't seem like a good idea anyway... NFS's performance is 
really bad and what you're doing will multiply bad x 2. I know sometimes 
you need to work with what you have but if your cluster is in any way 
I/O sensitive you should think about getting some local disk space for 
it, at least.

Yu Chen wrote:
> Hello,
> 
> I have a cluster, the disk space is on a Xserver, it's NFS exported, and 
> mounted on the cluster's head node without problem (mounted on 
> /mnt/nfs), then I exported the "/mnt/nfs" directory, then tried to mount 
> it on the nodes in the cluster (mount -t nfs headnode:/mnt/nfs 
> /mnt/tmp), it gave error: mount ... failed, reason given by server: 
> Permission denied.
> 
> my Xserver nfs exports entry has this: /Volumes/DataRAID  -alldirs 
> -maproot=nobody -sec=sys -network my.headnode.network -mask 255.255.255.0
> 
> my headnode mounted /Volumes/DataRAID on /mnt/nfs then exported as nfs 
> exports entry:
> /mnt/nfs 10.0.0.0/255.255.255.0(rw,sync)
> 
> Anybody has any suggestions?
> 
> Thanks in advance.
> CY
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-- 
Yuri Csapo
Academic Computing & Networking
Colorado School of Mines
CT-256
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