The FE cards on the filers don't autonegotiate at all. 5 out of 5 filers had performance problems when allowed to negotiate (Foundry switches). Once the card was hardcoded it performed nicely.
~JK
"Eisler, Alex" wrote:
Try setting the link options on the filer to 100/full. Cisco switches are very vulnerable in that department.
On the switch (when in enabled mode):
'set port mod/port speed 100'
'set port mod/port duplex full'
On the filer:
'ifconfig interface mediatype 100tx-fd'
Don't forget to change the ifconfig line in the rc file also...
I've seen it happen more than once that synch-negotiation problems deteriorate performance very noticeably...
Alex.-----Original Message----- From: Chuah, Nicholas [mailto:nicholas_chuah@yahoo.com] Sent: Monday, May 06, 2002 14:16 To: toasters@mathworks.com Subject: NFS Stats Questions
Hi all,
Unit 720 with on-board 100BaseT, DataONTAP 6.1, NFS over UDP 32K, all Sun
clients. Performance degradation was obvious after the switch was upgraded
to the Cisco 6050. Had been testing with the TCP changes and changing the
UDP datagram size to 8K but no significant improvement. Is there any
tweaking I can try before I attempt to add a quad card or gigabit card?
What can I deduce from the ifstat below with regards to the list overflow,
underflow value? I'm not sure whether it is an acceptable amount of errors
or an obvious performance issue given the amount of data transferred.
Another query I have is the "high" misses of the NFS cache reply stats.
I would appreciate any input to the above queries.
Regards,
Nic
RECEIVE
Packets: 3634m | Bytes: 1421g | Total errors: 0
No buffers: 0 | Length errors: 0 | Runt frames: 0
Long frames: 0 | Collisions: 0 | CRC errors: 0
H/w overflow: 136 | List overflow: 44048 | Rst frame drops: 0
TRANSMIT
Packets: 6606m | Bytes: 6761g | Total errors: 37
Collisions: 0 | Late collisions: 0 | Excess coll: 0
Queue overflow: 3913 | No carrier: 0 | H/w underflow: 11
Defer: 0 | Link failure: 25 | Time out: 0
List underflow: 1515 | Loss of carrier: 0 | No buffers: 0
DEVICE
Resets: 2
LINK INFO
Auto: Disabled | Mediatype: 100tx-fd |
Link Partner: Unknown | Link State: Up
NFS reply cache statistics:
TCP:
In progress Delay hits Misses Idempotent
Non-idempotent
0 0 6075661 0 0
UDP:
In progress Delay hits Misses Idempotent
Non-idempotent
3233 6072 642460762 5550 1024