RedHat Server hangs... how to troubleshoot.

[Lunt, Nick]

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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