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SM12 displaying lock entries hangs <br />Tip-No.: 1417 ( INFO1417 )

SM12 displaying lock entries hangs
Tip-No.: 1417 ( INFO1417 )

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Short text

SM12 displaying lock entries hangs
Tip-No.: 1417

Symptom

SI92 Display lock entires hangs or displays incorrectly.
Syslog points to problems writing to file (connection timeout).

Cause

The lock entries are to file for reporting purposes (parameter:
enque-backup_file, default: ENQBCK in global directory).
The problem occurs if this file lies via NFS on an external host and
cannot be written to due to performance or network problems.

Solution

The Enqueue-Backup-File ( Parameter: enque/backup_file,
Default: ENQBCK in the global directory) must lie on a local disk from
the viewpoint of the Enqueue server or the NFS fileserver must not
be allowed to isssue any timeouts. We recommend location on local disk.

Linked to this problem, the following NFS behavior has been established:
A process PA on Host A writes via NFS to a file on Host B.
A process PB on Host B reads the same files form the local file system.
A process PC on Host B reads the same file via NFS.
All processes have opened the file and accessed it with
fseek, fread, fwrite, fflush.

The write change is then only visible to PB and PC, after the writing
process PA has performed a dummy read.






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Length: 1388 Date: 20240329 Time: 113026     sap01-206 ( 15 ms )