Hi all,

I have db volumes on Netapp filer and it is mounted as NFS from AIX point of
view.Recently I migrated db volumes to this mount point on 100mbps /sec on
its NAS interface.

But later migrated to 1GB Network interface ,i.e netapp interface which is
also on 1GB interface connected to AIX p server.

Now my question is when  I have  CISCO 4000 Switch in between  the
observation was  found degradation in performance.So I enabled jumbo frames
on GB NICard on both sides i.e on AIX as well as on NT side i.e 9000 mtu
size .Now  futher degradation has taken place which was not tolerable.

It was  found that CISCO switch mtu size was 1500 and that of both servers
it was 9000(jumbo frames).

Now my question is:

1.Is it sufficient just to change mtu size on switch or we need to do some
tuneing further on switch.

As per aix network is concerned

I checked up tcp_sendspace , tcp_recvspace so I enabled rfc1323=1.
thewall is 1/2 of ram i.e mbuff and I don't see any problem with analysis on
netstat-m.
sb_max is 475236 which is ok and I don't see any errors on interface.

But I would like to know that what else I may be missing???

I need to improve performence but I see that there is degradation in
comparision with 100mbps NIC on netapp.

Please help me in this matter .

Thanks
Balanand Pinni