From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: POSIX I/O on NFS with noac option
Date: Thu, 12 Apr 2007 13:10:07 -0400
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On Thu, 2007-04-12 at 09:59 -0700, AK wrote:
> Trying to get this POSIX I/O code to work on our machines.
> 
> Running it from a NFS v3 mounted scratch sapce, with 'noac' option: no
> caching attribute option.
> It fails to run: gives me err= -1 and errno = 5
> 
> Although this works without error on my NFS v3 mounted home
> directories. Which are mounted from the head node of our cluster(Linux
> based head node and compute nodes).
> 
> Where as the scratch sapce is mounted of our storage server(Solaris).
> Any thoughts on issues related to Solars hosting NFS server and Linux
> nfs client ..with noac options ???
> 
> Any idea ? Appreciate any feedback
> ~thanks - ak
> 
> #include <fcntl.h>
> #include <errno.h>
> #include <unistd.h>
> 
> main()
> {
>    struct flock lock;
>    int fd, err;
> 
>    lock.l_type = F_WRLCK;
>    lock.l_start = 0;
>    lock.l_whence = SEEK_SET;
>    lock.l_len = 100;
> 
>    fd = open("test", O_RDWR | O_CREAT, 0644);
> 
>    err = fcntl(fd, F_SETLKW, &lock);
> 
>    printf("err = %d, errno = %d\n", err, errno);
>    close(fd);
> }

1) Why would you need the 'noac' flag if you are using locking?

2) Have you checked that the portmapper, rpc.statd and rpc.lockd are
accessible from the client? You can probe that using the commands

        rpcinfo -t <servername> status
and
        rpcinfo -t <servername> nlockmgr

if you are using UDP mounts, you might want to use

        rpcinfo -u <servername> status
and
        rpcinfo -u <servername> nlockmgr

instead...

Trond


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