Read/write access on nfs mounted file systems (corrected subject line)
Dr. Peter Bladon
cbas25 at strath.ac.uk
Fri Dec 2 20:57:45 UTC 2005
My apologies for my previous posting where the subject line was
I have a problem in that some of the file systems that I wish to mount
via nfs will not do so with write permissions set.
I have acquired 4 (substantially) identical machines that I intend to
use as a cluster (using gigabit ethernet), and also have linked to my
other Unix (IRIX) machines (using 100Mbit ethernet).
The basic configuration of the new machines is:
AMD64 Athlon/1Gbyte RAM/80Gbyte disk/Gigabit ethernet/.
Each machine is running Fedora Core 4 obtained from the five x86-64 iso
discs. I chose the option to load "everything".
The four machines are named Daffodil1, Daffodil2, Daffodil3, Daffodil4
Each of the four discs is partitioned by the loading process thus:
/dev/hda1 10 Gbytes / (System)
/dev/shm 5 Gbytes (Swapspace)
/dev/hda3 65 Gbytes /home (working area)
It is my wish to allow each of these four machines to be able to read
in each other's "working areas".
To this end I constructed the (relevant parts of) /etc/fstab thus:
LABEL=/home1 /home ext3 defaults 1 2 # From the loading
Rose:/userdisc12 /userdisc12 nfs rw,bg 0 0 # Mounting an SGI disk
Daffodil1:/home /daffodil01 nfs rw,bg 0 0 # Added by me
Daffodil2:/home /daffodil02 nfs rw,bg 0 0
Daffodil3:/home /daffodil03 nfs rw,bg 0 0
Daffodil4:/home /daffodil04 nfs rw,bg 0 0
Despite requesting that the (remote) mounts are read/write (rw) it has
proved impossible for (say) Daffodil1 to be able to write to the file system
daffodil02. It is also not possible for daffodil1 to write to
daffodil01 even though daffodil01 is effectively an alias for /home on
daffodil1. (daffodil1 can write to /home on daffodil1)
The machines (daffodil1 --- daffodil4) have no problem in writing on the
remote mounted discs on SGI machines (e.g. /userdisc12)
What am I missing? Is there some crucial flag that I have not set?
Is there a fundamental difference in the way that "mount" works under
UNIX and LINUX?
Note that machines are named Daffodil1 etc, while file systems are named
daffodil01 etc. (extra 0).
Any help would be appreciated.
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