Is it possible that /usr/common/tmp/outfile.txt already exists, and the shell has noclobber set?
On Tue, Dec 08, 2020 at 05:30:14PM -0800, David Mathog wrote: > Can anybody suggest why a script which causes writes to an NFS mounted > directory like so > > ssh remotenode 'command >/usr/common/tmp/outfile.txt' > > could somehow fail that write silently, but this variant > > ssh remotenode 'command >/tmp/outfile; mv /tmp/outfile > /usr/common/tmp/outfile.txt' > > would always succeed? > > (Actually it is slightly more complicated than this because > the whole command string shown above is constructed and then run in another > program within a system() call. Initially this turned up inside a threaded > version, but it does it even with a straight system() call. I cannot > reproduce this problem by running the ssh commands from the command line, it > only happens inside the script. The files so far have been relatively > small, less than 50kb. "command" is a run of the NCBI blastn program, > although that is probably irrelevant.) > > I have even seen this happen: > > ssh remotenode 'command >/usr/common/tmp/outfile.txt; ls -al > /usr/common/tmp/outfile.txt' > ls -al /usr/common/tmp/outfile.txt > > where the first ls (running on the remote node) shows the output file while > the second (running on the NFS server) does not. > > This is on a CentOS 7 system. The server was last updated 8 days ago but > the compute nodes have not been updated in almost a year. > > Server kernel is 3.10.0-1160.6.1.el7.x86_64 > Client kernel is 3.10.0-1062.12.1.el7.x86_64 > > There are no error messages in stderr, /var/log/messages, or dmesg. > > The client's fstab has: > > server:/usr/common /usr/common nfs bg,hard,intr,rw 1 1 > > and the server's /etc/exports has: > > /usr/common *.cluster(rw,sync,no_root_squash) > > > Thanks, > > David Mathog > mat...@caltech.edu > Manager, Sequence Analysis Facility, Biology Division, Caltech > > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > https://beowulf.org/cgi-bin/mailman/listinfo/beowulf -- Skylar _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit https://beowulf.org/cgi-bin/mailman/listinfo/beowulf
