RedHat Server hangs... how to troubleshoot.

Wed Nov 30 11:40:19 UTC 2005

Hi Nick,

Datacenter is a place where all the servers are kept at one place.. mounted
on racks..
The developers here run about 3 to 4 instances of weblogic on that server.
We have installed oracle 10g r1 client.

So far it was brought to my notice only when the server hung up.  I have
asked the developers to let me know when they use the server in future ...
so that I can monitor when they use.
I could only get a few warning messages from the logs... nothing much...

Nov 27 12:42:44 bangpcia4 kernel: Warning: acpi_table_parse(ACPI_SRAT)
returned 0!
Nov 27 12:42:44 bangpcia4 kernel: Warning: acpi_table_parse(ACPI_SLIT)
returned 0!
Nov 27 12:42:15 bangpcia4 redhat-support-check: WARNING: Red Hat Enterprise
Linux ES release 4 (Nahant Update 2) requires no more than 2 CPUs to run as
a supported configuration. (4 detected)
Nov 27 16:07:07 bangpcia4 kernel: Warning: acpi_table_parse(ACPI_SRAT)
returned 0!
Nov 27 16:07:07 bangpcia4 kernel: Warning: acpi_table_parse(ACPI_SLIT)
returned 0!
Nov 27 16:06:37 bangpcia4 redhat-support-check: WARNING: Red Hat Enterprise
Linux ES release 4 (Nahant Update 2) requires no more than 2 CPUs to run as
a supported configuration. (4 detected)
Nov 28 13:53:39 bangpcia4 kernel: Warning: acpi_table_parse(ACPI_SRAT)
returned 0!
Nov 28 13:53:39 bangpcia4 kernel: Warning: acpi_table_parse(ACPI_SLIT)
returned 0!
Nov 28 13:53:10 bangpcia4 redhat-support-check: WARNING: Red Hat Enterprise
Linux ES release 4 (Nahant Update 2) requires no more than 2 CPUs to run as
a supported configuration. (4 detected)
Nov 29 10:25:57 bangpcia4 kernel: Warning: acpi_table_parse(ACPI_SRAT)
returned 0!
Nov 29 10:25:57 bangpcia4 kernel: Warning: acpi_table_parse(ACPI_SLIT)
returned 0!
Nov 29 10:25:28 bangpcia4 redhat-support-check: WARNING: Red Hat Enterprise
Linux ES release 4 (Nahant Update 2) requires no more than 2 CPUs to run as
a supported configuration. (4 detected)

Thanks a lot,
Regards,
-GnanaShekar-

On 11/30/05, Lunt, Nick <Nick.Lunt at wesleyan.co.uk> wrote:
>
> Hi,
>
> Im afraid I dont know what you mean by the datacentre, we use the ilo to
> get console access via ssh.
> If it is the console thats actually hanging as well as the system and the
> led is orange then I'd be logging a call to support :(
>
> Is oracle installed on the box ? There's a problem with 10G at the moment
> where is constantly eats memory, but I believe the very latest version of
> 10G has fixed this.
> Have you checked the available memory ?
>
> A simple way to watch basic swap/mem info is "watch free" . It  might be
> worth doing this when the machine is working and looking if something is
> eating the memory, if so use other tools to find out what it is.
>
> I take it you've scoured the messages file for anything out of the
> ordinary, and any log files for applications running on the server ?
>
> I'd also try and run an extended memory test at boot see if it brings
> anything up.
>
> Good luck, let us know how it goes.
>
> Nick .
>
>
>
> > -----Original Message-----
> > From: unix syzadmin [mailto:unixsyzadmin at gmail.com]
> > Sent: 30 November 2005 09:09
> > To: General Red Hat Linux discussion list
> > Subject: Re: RedHat Server hangs... how to troubleshoot.
> >
> >
> > Hi Nick,
> >
> > Thanks for you reply.
> > We are using putty and ssh to connect to that RedHat server.
> > Generally we
> > are able to start a putty ssh session with the server.  When
> > it hangs... I
> > cannot connect to the server using putty over ssh.
> > When I go to the datacenter to see what it is like at the console, the
> > console display would be blank... The monitor led would have
> > turned orange.
> >
> > Regards,
> > -GnanaShekar-
> >
> > On 11/30/05, Lunt, Nick <Nick.Lunt at wesleyan.co.uk> wrote:
> > >
> > > Hi GnanaShekar,
> > >
> > > > -----Original Message-----
> > > > From: unix syzadmin [mailto:unixsyzadmin at gmail.com]
> > >
> > > > We have installed "Red Hat Enterprise Linux ES release 4
> > > > (Nahant Update 2)"
> > > > on HP rx4640.
> > > > The server hangs every day.  The server does not respond to
> > > > telnet and I
> > > > don't get the diplay at the console.
> > > >
> > > > Request you to suggest me on how to root cause the issue.
> > > >
> > > > Thanks & Regards,
> > > > -GnanaShekar-
> > > > --
> > >
> > > We've got a couple of RX4640's too. I updated them both to
> > RHAS Update 2
> > > and that stopped the X server from working. I couldn't be
> > bothered to fix it
> > > so I changed the runlevel to 3. However, we have some DL
> > servers to that
> > > updating caused the X server to fail, and on them I
> > reverted back to the X11
> > > rpms off the install CD.
> > >
> > > By default the server won't respond to telnet unless
> > telnet-server is
> > > installed.
> > >
> > > What does it do that indicates the server has hung ? I've
> > had a gander at
> > > the dmesg output you sent but there's nothing amiss that I can see.
> > >
> > > Nick .
> > >
> > >
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