Nagios 2.0rc2 on FC4 x86_64

[Chris Waters]

I have the same issue on Nagios 2.06b FC4 x86_64 although I have not
seen an actualy problem arise from the warning yet that I can tell.


Chris Waters
WAN/LAN Technician
JELD-WEN, Inc.
Network Services Group
===================




-----Original Message-----
From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of Miner,
Jonathan W (CSC) (US SSA)
Sent: Thursday, January 19, 2006 12:00 PM
To: nagios-users at lists.sourceforge.net
Subject: RE: [Nagios-users] Nagios 2.0rc2 on FC4 x86_64

I didn't modify "objects.h", so it must be the compiler padding things
differently for 64-bit.


-----Original Message-----
From:	nagios-users-admin at lists.sourceforge.net on behalf of Marc
Powell
Sent:	Thu 01/19/2006 02:32 PM
To:	nagios-users at lists.sourceforge.net
Cc:	
Subject:	RE: [Nagios-users] Nagios 2.0rc2 on FC4 x86_64


> -----Original Message-----
> From: nagios-users-admin at lists.sourceforge.net [mailto:nagios-users- 
> admin at lists.sourceforge.net] On Behalf Of Miner, Jonathan W (CSC) (US
SSA)
> Sent: Thursday, January 19, 2006 11:29 AM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Nagios 2.0rc2 on FC4 x86_64
> 
> Hi -
> 
> I've noticed an interesting warning when running Nagios on a 64-bit
> machine:
> 
> > Warning: Size of service_message struct (528 bytes) is > POSIX-
> guaranteed
> > atomic write size (512 bytes).  Service checks results may get lost
or
> > mangled!
> 

The most probable reason for this is that you have modified the
MAX_HOSTNAME_LENGTH (64), MAX_SERVICEDESC_LENGTH (64) or
MAX_OLUGINOUTPUT_LENGTH (348) variables from their defaults in
include/objects.h. They are set so that the entire service_message
struct is < 512 bytes. If that's not the case then you may be seeing
compiler oddities that cause other structs or types (int, timeval) to be
larger than normal.

> How concerned should I be?  Should I be looking for a 32-bit machine
to
> host my production instance of Nagios?

While I can't tell you all the possible problems that might result, one
that I know is that if you are using passive checks, the results may get
lost or mangled because they're larger than what can usually be written
to a named pipe in one go. 32-bit vs 64-bit isn't a factor unless 64-bit
allows for larger pipes. The hostname length + service description
length + plugin output length would have to be > ~480 bytes to be
worrisome.

--
Marc


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