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тАО01-04-2008 08:04 AM
тАО01-04-2008 08:04 AM
High Number of Dropped Tx packets normal?
I have a ProCurve 5406zl with 72 gigabit hosts attached to it, with two ports having a large number of drops Tx packets(~4,818,078). The hosts attached to these two ports are NFS servers (DL380's) that receive a large amount of write traffic from the other 70 hosts attached to the switch.
My question is is this drop rate seem normal? As a percentage it doesn't seem high ( Unicast Tx : 2,069,990,077 ) but the folks that monitor the network traffic claim the dropped packets are way to high.
Are there other reasons other than misconfiguration that the packet drop would be large ( e.g. I assume there is only so much buffer space on the 5406zl, would it drop after the buffers fill? Is there a way to detect that condition? )
Using "ifconfig" on the hosts in question I don't see any drops,overruns, errors, etc.
Thanks for any assistance.
-Cham
Here is the output from show int on one of the ports in question:
Port Counters for port C18
Name : stor
Link Status : Up
Bytes Rx : 2,820,671,298 Bytes Tx : 3,370,764,929
Unicast Rx : 4,028,570,168 Unicast Tx : 2,069,990,077
Bcast/Mcast Rx : 658,465 Bcast/Mcast Tx : 37,823,169
FCS Rx : 0 Drops Tx : 4,818,078
Alignment Rx : 0 Collisions Tx : 0
Runts Rx : 0 Late Colln Tx : 0
Giants Rx : 369 Excessive Colln : 0
Total Rx Errors : 369 Deferred Tx : 0
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тАО01-04-2008 08:30 AM - last edited on тАО01-05-2021 03:45 AM by Parvez_Admin
тАО01-04-2008 08:30 AM - last edited on тАО01-05-2021 03:45 AM by Parvez_Admin
Re: High Number of Dropped Tx packets normal?
Hi
Drops every where could happen, but maybe with number its not normal.
I wonder if had some best practices in your network like segregating these 2 Servers in a different Vlan with a high QoS enabled.
I also wonder if you need to enable Jumbo frames for your NFS, or its using a normal packet size.
You may also have a look at the following useful link from ProCurve to troubleshoot such situations:
https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c01830354
Good Luck !!!
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тАО01-04-2008 09:19 AM
тАО01-04-2008 09:19 AM
Re: High Number of Dropped Tx packets normal?
Thanks for the ideas. I will look at the document.
The 70 nodes are DL140's that don't support jumbo frames.
I am not sure how does the QoS/VLAN remedy buffer limitations? This is private switch and the only traffic on it is NFS.
Also on this switch 5406zl is the buffer space "per module", e.g. moving each server to its own module improve the situation ( if it is a buffer limitation) or are the internal buffers not related to the module itself. This is fully populated switch with plenty of empty ports I could move around.
Thanks!
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тАО01-04-2008 12:33 PM
тАО01-04-2008 12:33 PM
Re: High Number of Dropped Tx packets normal?
1) Do you have broadcast-limit enabled? If so, try disabling that.
2) To maximize the amount of memory available for buffering, you can configure to switch for 2 output queues. This does require a reboot.
3) What is the utilization on the links to the NFS servers? If they are very busy, you may need to increase the bandwidth to the servers by using multiple links. (trunking)
4) Does the behavior change if you enable flow-control?
casevh
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тАО01-04-2008 06:17 PM
тАО01-04-2008 06:17 PM
Re: High Number of Dropped Tx packets normal?
Anyhow, I'll repeat that if those other things don't work-out, you could try trunking/bonding/aggregating two links from the servers to the switch(es) to increase the aggregate bandwidth and address the many-to-one bit. That or upgrade those connections to 10Gig :)
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тАО01-06-2008 07:31 PM
тАО01-06-2008 07:31 PM
Re: High Number of Dropped Tx packets normal?
Thanks!
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тАО01-06-2008 09:27 PM
тАО01-06-2008 09:27 PM
Re: High Number of Dropped Tx packets normal?
config
interface C18
broadcast-limit 0
flow-control
casevh
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тАО01-07-2008 09:54 AM
тАО01-07-2008 09:54 AM
Re: High Number of Dropped Tx packets normal?
If going to 10G is not an option, I'd look into bonding two links between the swtich and the server in this case to increase aggregate bandwidth into the server.
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тАО04-17-2008 03:21 AM
тАО04-17-2008 03:21 AM
Re: High Number of Dropped Tx packets normal?
During peak we are having about 500 mbit of traffic and there are a lot of drops.
Could it be that HP/Procurve has other errors included in the Drops Tx counter ? Such as CRC ?
Regards,
Chris
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тАО09-16-2008 12:08 AM
тАО09-16-2008 12:08 AM
Re: High Number of Dropped Tx packets normal?
Libras