Re: High load average mail server 5.3-RELEASE
From: Mariano Benedettini (marianobe_at_gmx.net)
Date: 09/23/05
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Date: Fri, 23 Sep 2005 16:55:06 -0300 To: Eric Anderson <anderson@centtech.com>
Thanks for all the replies. It's not a HD problem.
On monday I'll increase the number of nfsd processes and the number of
nfsiod on the client, setting both to 50,
I think that the nfs performance will be much better :-)
Mariano.
Eric Anderson wrote:
> Francisco Reyes wrote:
>
>> On Tue, 13 Sep 2005, mariano benedettini wrote:
>>
>>> 91.3% idle
>>
>>
>>
>> CPU is not the problem. :-)
>>
>>
>>> Mem: 1599M Active, 1704M Inact, 311M Wired, 189M Cache, 112M Buf, 14M
>>> Free
>>> Swap: 2023M Total, 184K Used, 2023M Free
>>
>>
>>
>> Swap is not the problem.
>>
>>
>> Do
>> vmstat 10
>>
>> Watch the output.
>> In particular look at the first 3 columns.
>> procs
>> r b w
>> 1 1 0
>> 0 1 0
>> 1 1 0
>>
>> The left most column is CPU, the second column is disk IO.
>>
>> If you have a number in the "b" column and it never hits 0 you have an
>> I/O problem. You HDs are not catching up.
>>
>> If you are using NFS and the "b" colun is not high and hits 0 some/all
>> the time then the bottleneck is either the nfs connection or the nfs
>> server.
>>
>> For example I have some servers that the "b" column would be between
>> 20 and 60 for a while. I am currently working on removing some of the
>> load of the machine. In my case more memory would help, but the
>> computer vendor we bought the machine from has sent us the wrong
>> memory 3 TIMES!!
>
>
> Also, if it is an NFS server, one should check the cpu times on the nfsd
> processes. I've found that many times there aren't enough nfsd
> processes to take the load from many clients. Increasing the number
> (double it) often helps this. The max in 5.3 is 20, but you can easily
> change it and get around it.
>
> Eric
>
>
>
>
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