I found that there was a SMF log file: /var/svc/log/milestone-multi-user-server:default.log.0 which occupied around 19G bytes.
Please help me how to purge this massive file.
Can I just use cat /dev/null > /var/svc/log/milesto..... to this file without any interruption to a non-stop system?
Please Help.
You already know how:
This will zero the file without interrupting any processes that had it open.
That's not guaranteed to work.
Depending on how the file was opened, how it's written to, and the specifics of how the underlying file system handles attempts to write past the end of a file, you could wind up doing nothing more than creating a file every bit as large as it was, only whatever data that was in the file is lost.
Here's what happens:
1. A process has an open file descriptor on a file, and the file was not opened in "append" mode.
2. File is truncated to zero bytes by an outside process.
Note that file descriptors have a "current" offset associated with them, and operations outside the process do not effect that position.
3. The process writes to the file, and the bytes go to the original pre-truncation "current" offset in the file.
4. If the underlying file system does not support sparse files, it's back to being 19GB. If the file system does support sparse files, an "ls -l" will still show the file as being 19 GB, but a "du" will show that the file actually uses much less space.
And all bets are off if a process has a file memory-mapped and the file is truncated out from under the mapping. Just try truncating a binary executable when a copy of that binary is running....
For this issue, can logadm command to saftey truncate "milestone-multi-user-server:default.log.0" or setup a command line inside logadm.conf and let O/S to automatic truncate, keep rotate the file in 3 and limit the file size to 10M.
Thanks!
friends
good morning
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Please help .................
Thanks in advance !!!
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