[ale] Wow! Check out these load averages!

[Jeff Layton]

"Michael D. Hirsch" wrote:

> On Tuesday 11 March 2003 09:26 am, Jonathan Glass wrote:
> > Turns out someone had shutdown a machine that this box attaches to via
> > NFS, so the box was hanging waiting for the NFS connection.  It wouldn't
> > reboot for the same reason.
>
> A trick I've learned is to either mount the NFS drives with the "soft"
> option, or with "hard,intr".  In either case, this should allows
> operations to fail and exit when the server goes down.
>
> For some reason, the docs say that the latter is recommended.  I had always
> used the former with no bad effects.  Check the docs for the "intr" option
> as I'm not sure I spelled it right.

If you want data integrity, you want to mount "hard". If you use
the "soft" option, you help prevent problems with client instability
during server and network outages, but you also expose your
applications to silent data corruption. So, I always use "hard,intr".
You can also play with the time-out value (timeo) and several
options to improve behavior if the NFS server or network dies.

Jeff


>
>
> Michael
>
> > Thanks, man.
> >
> > Jonathan
> >
> > On Mon, 2003-03-10 at 22:50, John Wells wrote:
> > > Exactly.  And once you're attached, "backtrace" will usually provide
> > > some telling info.
> > >
> > > John
> > >
> > > James P. Kinney III said:
> > > > gdb <PID> will attach it to the running (or in your case, hung)
> > > > process
> > > >
> > > > help will give info on classes of things you can do. help <topic>
> > > > gives more detail.
> > > >
> > > > Since ftpd is acting up, bounce the networking setup. Also try
> > > > running a tcp sniffer to see if you are being attacked. tcpdump is a
> > > > good idea. If you see ports being half-opened by the same ip, block
> > > > them at the firewall.
> > >
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>
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--

Jeff Layton
Senior Engineer
Lockheed-Martin Aeronautical Company - Marietta
Aerodynamics & CFD

"Is it possible to overclock a cattle prod?" - Irv Mullins

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