Re: Help: nfs not able to mount large (loopback) directory

["Dean S. Messing" <deanm@sharplabs.com>]

Trond Myklebust wrote:
: fr den 03.06.2005 Klokka 20:19 (-0700) skreiv Dean S. Messing:
: > 
: > I have a large .iso image (4GB) on machine B which I have loopback
: > mounted to directory /mnt/disk.
: > 
: > When I try to nfs mount B:/mnt/disk to machine A I get a "permission
: > denied" error.
: > 
: > If I replace the 4GB image on machine B with, say, a 700MB .iso image, I have
: > no problem with the NFS mount on machine A.
: > 
: > I'm running the latest version of MandrivaLinux (2005LE == Mandrake 10.2)
: > on machine B and MandrakeLinux 10.0 on machine A so the nfs utilites
: > on machine B (the server) should be nearly current.
: > In fact:
: > 
: > [root@neuron ~]# rpcinfo -p
: >    program vers proto   port
: >     100000    2   tcp    111  portmapper
: >     100000    2   udp    111  portmapper
: >     100003    2   udp   2049  nfs
: >     100003    3   udp   2049  nfs
: >     100003    4   udp   2049  nfs
: >     100003    2   tcp   2049  nfs
: >     100003    3   tcp   2049  nfs
: >     100003    4   tcp   2049  nfs
: >     100021    1   udp  34593  nlockmgr
: >     100021    3   udp  34593  nlockmgr
: >     100021    4   udp  34593  nlockmgr
: >     100021    1   tcp  33635  nlockmgr
: >     100021    3   tcp  33635  nlockmgr
: >     100021    4   tcp  33635  nlockmgr
: >     100005    1   udp    846  mountd
: >     100005    1   tcp    849  mountd
: >     100005    2   udp    846  mountd
: >     100005    2   tcp    849  mountd
: >     100005    3   udp    846  mountd
: >     100005    3   tcp    849  mountd
: >     100024    1   udp    888  status
: >     100024    1   tcp    891  status
: > 
: > 
: > Is it the case that nfs (mountd?) can't handle "large" files?
: 
: It is true that NFS version 2 cannot handle files > 2GB, but as far as I
: gathered you are not exporting the ISO as a single file. Besides, NFSv3
: and NFSv4 should be quite capable of dealing with a 4GB file.
: 
: This therefore sounds more like it might be some strange interaction
: between the loopback driver and nfsd or mountd.

>From my reading your remarks sound correct.  I wonder  how I can
fix this problem.  Loopback mounting a DVD .iso image and making
it available via NFS has got to be something that is fairly commonly
done.

Dean


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