selecttest tool
Walter
gouldwp at auburn.edu
Sun Aug 10 00:54:10 UTC 2008
JINMEI Tatuya / 神明達哉 wrote:
> I have a couple of suggestions:
>
> 1. you should specify a larger max-cache-size in named.conf. the
> default size of 9.5.0 (32MB) is normally too conservative for a
> busy server with many clients, reducing cache hit rate and making
> the server busier, and possibly triggering subsequent performance
> troubles as a result.
> 2. #1 may be sufficient for you, but you may also want to raise
> recursive-clients (whose default is 1000) to some reasonable large
> value (e.g., 10000). I suspect the primary reason for the SERVFAIL
> in your case is that the server hits the recursive-clients quota.
> I suspect the server left warning messages like ""no more recursive
> clients: ...". Raising recursive-clients will at least solve this
> issue.
>
>
>
Jinmei,
Based on your above sugestions, I did the following:
1) set my max-cache-size to 320MB (I thought ten times the default
would be ok - this box has 2gb or ram)
2) set my recursive-clients to 10,000
Everything rocked along fine for about 12 hours. This morning (while I
was out of town), I received calls that dns queries were failing. When
I got back, I see transfer errors in the logs for the time period that
it seemed to be failing. This is what was appended to the end of the
transfer errors:
failed setting up socket: not enough free resources
Any ideas? I know you probably need more info. than the above. This
server is running RHEL5 and I am using the RHEL bind rpm
(bind-9.3.4-6.0.2.P1.el5_2). Let me know what other info. you need. If
it happens again, I will send output from rndc status.
Thanks,
Walter
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