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Full Discussion: Solaris 10 massive SMF log file
Operating Systems Solaris Solaris 10 massive SMF log file Post 302845465 by achenle on Wednesday 21st of August 2013 02:43:52 PM
Old 08-21-2013
Quote:
Originally Posted by jlliagre
A couple of comments:
  • The chances the OP file system used to store the log file doesn't support sparse file is zero, it is very likely ZFS or UFS.
  • cat /dev/null is pointless, it does nothing useful despite popular belief so can be replaced by the no-op shell command : for the same effect:
    Code:
    : > /path/to/logfile

    or even by nothing with most shells:
    Code:
    > /path/to/logfile

Try running "cat" or "grep" on a 300 GB or larger sparse file.

And imagine what kinds of fun will happen after that sparse file grows to a few terabytes in size and an admin who doesn't understand sparse files sees that it's "bigger than the entire file system".
This User Gave Thanks to achenle For This Post:
AlexLi
 

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LEARN ABOUT MOJAVE

nislog

nislog(1M)						  System Administration Commands						nislog(1M)

NAME

       nislog - display the contents of the NIS+ transaction log

SYNOPSIS

       /usr/sbin/nislog [-h num | -t num]  [-v] [directory...]

DESCRIPTION

       nislog  displays  the  contents of the NIS+ server transaction log on the standard output. This command can be used to track changes in the
       namespace. The /var/nis/trans.log file contains the transaction log maintained by the NIS+ server. When updates occur, they are	logged	to
       this  file  and	then  propagated  to replicas as log transactions.  When the log is checkpointed, updates that have been propagated to the
       replicas are removed.

       The nislog command can only be run on an NIS+ server by superuser. It displays the log entries for that server only.

       If directory is not specified, the entire log is searched. Otherwise, only those logs entries that correspond to the specified  directories
       are displayed.

OPTIONS

       -h num	       Display num transactions from the ``head'' of the log. If the numeric parameter is  0, only the log header is displayed.

       -t num	       Display	num transactions from the ``tail'' of the log. If the numeric parameter is  0, only the log header is displayed.

       -v	       Verbose mode.

FILES

       /var/nis/trans.log      transaction log

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWnisu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       nis+(1), rpc.nisd(1M), nisfiles(4), attributes(5)

NOTES

       NIS+  might  not  be  supported in future releases of the SolarisTM Operating Environment. Tools to aid the migration from NIS+ to LDAP are
       available in the Solaris 9 operating environment. For more information, visit http://www.sun.com/directory/nisplus/transition.html.

SunOS 5.10							    12 Dec 2001 							nislog(1M)
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