How To Rotate A File in HP-UX?

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Operating Systems HP-UX How To Rotate A File in HP-UX?
# 15  
Old 10-30-2013
have you tried nzle's suggestion from #10 with the 'kill -1 PID' suggestion?
Maybe the app writing to the long will catch an interrupt and act accordingly...
Worth a try (not knowing the internals of the app).
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# 16  
Old 10-30-2013
What I dont understand is if the file is zeroed ( >file) how come it the next minute be greater than previously...
I just remebered that in 11.11 you have in SAM: "Routine tasks>Sytem log files " the possibilty by clicking on the menu Action to add to list and configure...
What about trying?

Is your log "per line"?

And Yes I would give a kill -1 a try... it doesnt always work but if it does...

Last edited by vbe; 10-31-2013 at 12:34 PM.. Reason: typo
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# 17  
Old 10-30-2013
You must update (restart, kill -HUP, ...) your application.
Read your application documentation.
Even logrotate would need such an action; a pre-rotate or post-rotate action.

man open

tells that the O_APPEND flag in open() jumps to the end of the (with the old file size) prior to every write.

Last edited by MadeInGermany; 10-30-2013 at 05:28 PM..
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# 18  
Old 10-30-2013
Originally Posted by vbe
What I dont understand is if the file is zeroed ( >file) how come it the next minute be greater than previously...
Originally Posted by MadeInGermany
man open

tells that the O_APPEND flag in open() jumps to the end of the (with the old file size) prior to every write.
That's incorrect. Before each write(), O_APPEND sets the descriptor's offset to the current end of file. If a file opened with O_APPEND is truncated to 0 size, the next write would see that and would place its bytes at the beginning of the file.

What we're seeing here is the absence of O_APPEND. Truncation does not affect the offsets of open file descriptions, so, without O_APPEND, writes continue where they had been located before truncation; file size is restored with null bytes replacing what had been truncated.

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# 19  
Old 10-31-2013
Thanks to all.

Allister describes the exact problem. I cannot modify the application code and i try to find a solution with a script rotate (not possible if i dont modify application) or splitting the output (not possible...i lost data when i stop the application).

Fail attempt!
# 20  
Old 11-18-2013
Originally Posted by nzle
logrotate implements what vbe is describing using the 'copytruncate' option in the configuration file.
Yes we've had good results with the copytruncate option as well, in logrotate on hp-ux 11.31.

We too have an application that is continuously writing output to the same log file, and it grows to many GB within a week. We configured logrotate to rotate it daily, keep 30 prior days worth of logs, compress the old logs, and use copytruncate to keep the application happy. It works very well.
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