[ale] Network issue that makes absolutely NO sense

[Ryan Fish]

A bit more info that may be helpful:

 

- The Oracle server only fails because it is unable to read from the NAS.
This causes the IOWait on the processors to hit the high 90% range and stay
there until the box eventually is too busy to respond to requests from the
application that uses it.

 

Is there some way to test if a switch is truly using Full Duplex on a port?

Does it make any difference if the NIC in the Oracle server is set to 100FD
(the highest it can go) and the NIC on the server running the other backup
scripts is set to 1000FD?  The NAS is set to 1000FD.  Is there something in
the way 100FD and 1000FD work that keeps them from being able to truly work
together properly?

 

Thank you again.

-Ryan

 

  _____  

From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Ryan
To: ale at ale.org
Fish
Sent: Thursday, May 11, 2006 8:53 PM
To: 'Atlanta Linux Enthusiasts'
Subject: [ale] Network issue that makes absolutely NO sense

 

I have found the following issue with two different backup processes after
putting a new switch in place within the network:

 

1) RHEL3 AS/Oracle 9i server using RMAN and Export for backups.

    - As long as the NIC on the NAS device to where all backup information
is written is set to 100FD the backup processes will run as per normal and
all is well.  Once the NIC on the NAS is set to 1000FD the backups fail
because the Oracle server is unable to connect to the NAS device over the
NFS mount.

 

2) RHEL3 ES server running multiple bash scripts to back up portions of
almost every other box in the same network.  The backup scripts run fine
when the NIC on the NAS is set to 1000FD but fail when I set it to 100FD.

 

Prior to replacing the failed switch this was never an issue as all backups
ran fine every night with the exception of one that ran fine most times.
Only the switch was swapped out did this network strangeness occur.

 

What could/would cause this?

Why would it matter when speed the NIC on the NAS is set to for particular
backup processes to function properly?

Is there anywhere within the RMAN and/or Export processes that the NIC speed
on the receiving end could or would be hard coded to only accept 100FD?  If
so, why?

 

I am at a complete loss here and have been fighting this for two weeks
already so any help will be greatly appreciated.

 

Thank you.

-Ryan

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