Messages in this thread | | | Date | Wed, 22 Feb 2006 11:30:55 +0100 | From | Ramon van Alteren <> | Subject | Re: Writing to an NFS share truncates files on >8Tb Raid + LVM2 |
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Ramon van Alteren wrote:
> I'd like to report a situation which looks like a bug in the kernelbased > nfs server implementation. > > Based on responses from a different mailinglist and google I tried unfsd > the userspace nfsd implementation which appears to work fine (still > testing) The above test-case works for both loopback and remote > mounted filesystems. > > I'm not on the list so please CC me.
unfsd appears to suffer from the same problem only it has a higher treshold for them to appear. We're seeing the same behaviour with larger files created.
for i in `seq 1 10`; do dd count=400000 bs=1024 if=/dev/zero of=/root/test-tools/test.tst; ls -lha /root/test-tools/test.tst ; rm /root/test-tools/test.tst ; done
400000+0 records in 400000+0 records out dd: closing output file `/root/test-tools/test.tst': No space left on device -rw-r--r-- 1 root root 328K Feb 22 09:53 /root/test-tools/test.tst 400000+0 records in 400000+0 records out dd: closing output file `/root/test-tools/test.tst': No space left on device -rw-r--r-- 1 root root 176K Feb 22 09:53 /root/test-tools/test.tst 400000+0 records in 400000+0 records out dd: closing output file `/root/test-tools/test.tst': No space left on device -rw-r--r-- 1 root root 168K Feb 22 09:53 /root/test-tools/test.tst 400000+0 records in 400000+0 records out dd: closing output file `/root/test-tools/test.tst': No space left on device -rw-r--r-- 1 root root 176K Feb 22 09:53 /root/test-tools/test.tst
A test with the same command directly onto the local filesystem runs without problems.
for i in `seq 1 10`; do dd count=400000 bs=1024 if=/dev/zero of=/data/bonnie++/test.tst; ls -la /data/bonnie++/test.tst ; rm /data/bonnie++/test.tst ; done 400000+0 records in 400000+0 records out -rw-r--r-- 1 root root 409600000 Feb 22 09:59 /data/bonnie++/test.tst 400000+0 records in 400000+0 records out -rw-r--r-- 1 root root 409600000 Feb 22 09:59 /data/bonnie++/test.tst 400000+0 records in 400000+0 records out -rw-r--r-- 1 root root 409600000 Feb 22 09:59 /data/bonnie++/test.tst 400000+0 records in 400000+0 records out -rw-r--r-- 1 root root 409600000 Feb 22 09:59 /data/bonnie++/test.tst 400000+0 records in 400000+0 records out -rw-r--r-- 1 root root 409600000 Feb 22 10:00 /data/bonnie++/test.tst
Any help would be much appreciated.
Based on a comment from Lee Revell, I can reproduce the same behaviour with both sync & async options set on the nfs server (kernel and userspace)
Regards,
Ramon
-- To be stupid and selfish and to have good health are the three requirements for happiness, though if stupidity is lacking, the others are useless.
Gustave Flaubert
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