Re: RE: autofs scalability

[Mike Waychison <Michael.Waychison@Sun.COM>]

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Ogden, Aaron A. wrote:

>Hello all,
>I was reading through Joe Pranevich's "Wonderful World of Linux 2.6" and
>I came across this, I thought you might find it interesting. (source:
>http://kniggit.net/wwol26.html)  The "Network Filesystems" section makes
>for interesting reading as well.  If I am reading this correctly, the
>'unnamed device' limit has been raised from 256 to 4096 in kernel 2.6,
>can anyone confirm this?  
>

No.  The major count went from 256 -> 4096.  The minor count went from 
256 to 1048576.  The maximum pseudo-block-device limit is still 256 
currently.

>If this is the case the only barrier left to
>remove is the RPC port limitation of ~800 open ports.  If the
>connections were multiplexed such that all connections to a given server
>used the same port then 800 ports would stretch a lot farther than they
>do now...
>
>  
>
Yes.  This has been identified as an upper limit.  :(

But you're right, these two limits are blocking being able to mount 
large numbers of NFS mounts.


-- 
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice
mailto: Michael.Waychison@Sun.COM
http://www.sun.com

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