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ECB ??

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Suparuki

Suparuki

ISP
May 28, 2004
2
US
Hey is there anyone out there that can give me some insight into what ECB's are in a novell environment? The only information I can find is that they are Event Contrl Blocks or something like that but I cant find out what that means, who generates them, or why. I have a customer that has a netware environment and he has multiple sites that are all connected to each other. Each site has its own netware server and once or twice a week these ECB's are jumping from the usual 0-5 to like 5000 or 25000 I cant remember and then it kills the server. I am not a novell person at all so im sure their are some innacuracies in some of what I have said. If I knew what port or what protocol these little buggers used then I would be able to track down where they are coming from and possible stop them at the source. Does this even seem possible? Any help would be greatly appreciated.

Thanks
 
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Hi,

I found the following, as far as meaning.

No ECB Available Count - A counter that increments when a device sends a packet to your NetWare server, but no packet receive buffer is available. The NetWare server allocates more packet receive buffers after each incident until it reaches its maximum limit (configured with a SET parameter).

Also check out the following links to assist in troubleshooting your problem:



You should also tune your server:


I hope this helps you out.

Lou
 
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I'm pretty sure you're going to see some sort of errors on the server console, or in the SYS$LOG.ERR, or if the server is abending then in the ABEND.LOG.

Might give you some clues as to why this is happening.

Marvin Huffaker MCNE, CNE
Marvin Huffaker Consulting
 
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Basically if your ECB counts go up the server cannot get a packet onto the wire, it holds it in a cashe area(ECB). If the ECB count has reached its maximum setting you will crash the server.

If this happens consistently,
Make sure the LAN card is running at highest speed and full duplex.
Increase the Max ecb count(Suggest 15000 if you are seeing 10000 already)
Check the rest of the lan when this issue occurs. Maybe faulty device somewhere.


Lee Smith
Associated Network Services
Snr Systems Engineer
Lee.Smith@ANSPLC.Com
 
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ECBs are packet buffers.
The buffer size grows fast if the server is busy.
Is this on 10/100/1000 Mbit?

It means your server/NICs are slow in handling the incoming
traffic.

George Walkey
Senior Geek in charge
 
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