Messages in this thread | | | From | Bünnemann, Thomas <> | Subject | NFS4 Client hangs when copying large files as of kernel version 4.4 | Date | Mon, 4 Jul 2016 07:41:11 +0000 |
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NFS4 Client hangs when copying large files as of kernel version 4.4
Full description of the problem/report: When doing simple copy-jobs with large files (f.ex. partition Images > 4 GByte filesize) the file transfer stalls after about 2 -16 GByte has passed to the NFS-client. No problems using kernel-versions up to kernel 4.2.
Autonegotiated NFS-mount-values are still the same between 4.2 and 4.4/4.7rc5
server:/informatik/ab on /informatik/ab type nfs4 (rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp, port=0,timeo=600,retrans=2,sec=krb5,clientaddr=134.100.9.19,local_lock=none, addr=XXX.XXX.XXX.XXX)
Keywords (i.e., modules, networking, kernel):
Kernel version (from /proc/version): Linux version 4.7.0-040700rc5-generic (kernel@tangerine) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-4ubuntu1) ) #201606262232 SMP Mon Jun 27 02:34:07 UTC 2016
A small shell script or example program which triggers the problem: /informatik/ab/backup/ contains 8 files - each about 4Gbyte in size, simple command: 'cp /informatik/ab/backup/*.ghs /tmp'
Regards,
Thomas Bünnemann Universität Hamburg, FB Informatik Rechenzentrum Vogt-Kölln-Str. 30 22527 Hamburg
Tel.: ++49 40 42883-2278 Fax: ++49 40 42883-2241
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