Fletcher Mattox wrote:
> Jeff Moyer writes:
>
>
>> http://people.redhat.com/jmoyer/autofs_linux_kongress.pdf
>>
>
> Jeff,
>
> Nice paper. Thanks! I'm suffering from RPC port exhaustion (you
> responded to one of my queries last week), so I am especially interested
> in your section on port allocation. You state
>
> When a service requests an RPC connection, binding to
> a reserved port is the default. The RPC layer scans
> ports starting from 800 down until it finds one that
> is unallocated.
>
> My experience is that the 2.6.17.4 kernel allocates between 512 and 1024
> and then begins with unreserved ports >33000. Yeah, I know. It's just
> a nit, but I thought I'd tell you anyway.
>
> The most interesting part of the paper was the comment about a practical
> limit of 100 mounts in rapid succession. I am certain this is the limit
> we have bumped into. Do you see any improvement in this in autofs 5?
>
> Unprivileged ports and/or UDP are not viable options for us, so I am
> forced to increase the timeout from 5 minutes to 24 hours, which in
> practice means they are always mounted. We have about 400 automounted
> filesystems, so the only long term solution for us is to try to coalesce
> them to less than 100. Very painful.
You have 400 automounted file systems, all of which need to be mounted at
the same time? If so, I might suggest that static mounts might better serve
your needs. Or, rethink the application and deployment.
Thanx...
ps
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