Symptom
- Dispatcher, work processes are hanging
- SM51: instance doesn't appear there
- ls -al /usr/sap/SID/instance/work command just hanging
- dev_disp cannot be opened
- sapstack <PID> command cannot debug the process, just hanging
- operating system debug tools (e.g. GDB) cannot debug the process, just hanging
- in dmesg similar entries may appear like
[36721.049838] [<ffffffffa0779fb0>] ? nfs4_xdr_dec_access+0xc0/0xc0 [nfsv4]
[36721.049844] [<ffffffffa077a040>] ? nfs4_xdr_dec_getattr+0x90/0xa0 [nfsv4]
[410068.065140] nfs: server <server name> not responding, still trying
- df /usr/sap/SID/instance/work
and|or
df /usr/sap/SID/instance/exe points to <server name> above, e.g.:
df /usr/sap/SID/D04/work
Filesystem 1K-blocks Used Available Use% Mounted on
<server name>:/usr/sap/SID 25672704 6608896 17753088 28% /usr/sap/SID
df /usr/sap/SID/D04/exe
Filesystem 1K-blocks Used Available Use% Mounted on
<server name>:/usr/sap/SID 25672704 6608896 17753088 28% /usr/sap/SID
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Environment
SAP on UNIX, Linux operating system
Keywords
hanging, NFS, NFSv3, NFSv4, dbg, gdb, local, sapstack , KBA , BC-OP-LNX , Linux , BC-CST , Client/Server Technology , BC-CST-DP , Dispatcher, Task Handler , BC-OP-AIX , IBM AIX , BC-OP-HPX , HP-UX , BC-OP-SUN , SUN Solaris , Problem
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