Re: sadc and flock
On Fri, Apr 09, 2004 at 03:03:56PM -0600, Grant Grundler wrote:
> Hi all,
> I was getting cron job output from /usr/lib/sysstat/sa1 script.
> The error was something like "flock: resource not avaiable".
RTFM...but it doesn't solve the problem:
-L sadc will try to get an exclusive lock on the outfile before
writing to it or truncating it. Failure to get the lock is
fatal, except in the case of trying to write a normal (i.e. not
a dummy and not a header) record to an existing file, in which
case sadc will try again at the next interval. Usually, the only
reason a lock would fail would be if another sadc process were
also writing to the file. This can happen when cron is used to
launch sadc . If the system is under heavy load, an old sadc
might still be running when cron starts a new one. Without lock-
ing, this situation can result in a corrupted system activity
In general, this box does NOT get heavily loaded. It's a FTP/HTTP server
as well but only for local, internal (.cup.hp.com) traffic.
MRTG shows 5 minutes avg outbound is < 500KB/s during peak usage.
So I'm still looking for other explanations.