A fix is available
APAR status
Closed as program error.
Error description
If you have an operation such as a dd running over an nfsv4 mounted filesystem, with the hard option set (the default). If you try to unmount using the force option(umount -f) it will hang indefinitely. Also, commands like nfsstat will hang. Example dd operation: while true do dd if=/dev/zero of=/nfs_fs/bigfile count=2048 done
Local fix
1) do CTRL+C (or kill -9) on the umount process after about 10secs 2) specify the "soft" option on the mount
Problem summary
On an NFS mount, if a copy operation is going on, and the server is down, and if we issue a forced unmount command, it may hang indefinetely.
Problem conclusion
Changed NFS client side code to avoid a deadlock which caused the unmount command to hang.
Temporary fix
Comments
6100-06 - use AIX APAR IZ97382 7100-00 - use AIX APAR IZ97413
APAR Information
APAR number
IZ97382
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2011-03-28
Closed date
2011-03-28
Last modified date
2013-04-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U835918
UP11/05/10 I 1000
PTF to Fileset Mapping
U835918 bos.net.nfs.client 6.1.6.15
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Document Information
Modified date:
16 April 2013