[ale] Network issue that makes absolutely NO sense

[Jerry Yu]

to have a nice smooth communication,
1) nic and the switch port it connects to should have matching
speed/duplex/auto_neg|manual
2) two-end points of a switched communication should have matching speed and
duplex.

what's the model of the new switch?  You may find speed/duplex/auto_neg
settings per port on the switch itself.


On 5/11/06, Ryan Fish <FishR at bellsouth.net> wrote:
>
>  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
> 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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