the problem is likely the algorithm used to allocate
ports for the RPC transport sockets. it starts at
port 800 and goes down to zero.
> -----Original Message-----
> From: Ian Kent [mailto:[email protected]]
> Sent: Thursday, October 09, 2003 6:09 PM
> To: Mike Waychison
> Cc: Ogden, Aaron A.; autofs mailing list; [email protected]
> Subject: [NFS] Re: [autofs] multiple servers per automount
>=20
>=20
> On Thu, 9 Oct 2003, Mike Waychison wrote:
>=20
> > Ogden, Aaron A. wrote:
> >
> > >Ouch. As you may know, the limit is *much* lower in=20
> linux. Something
> > >that I've been struggling with recently...
> > >
> > >Under normal circumstances I would not be concerned with=20
> 'limitations'
> > >of a few hundred active NFS mounts, but such limitations=20
> certainly limit
> > >scalability for the extreme cases.
> > >
> > >
> >
> > The maximum number of plain pseudo-block device filesystems=20
> on a given
> > filesystem is limitted to 256. (This includes proc, autofs, nfs..).
> >
> > This is because pseudo-block filesystems all use major 0,=20
> and each have
> > a different minor (thus the 256 limit).
> >
> > There are however patches floating around (look at SuSe's=20
> kernels, I'm
> > not sure about RH) that allow n majors to be used (default 5). This
> > gives you 1280 mounts, a big step up :)
> >
>=20
> But as Aaron and I know things go pear shaped at just shy of=20
> 800 mounts
> with RedHat kernels. They have the more-unnamed patch.
>=20
> So this would indicate that even if there is a device system that can
> increase the number of unnamed devices that subsystems like NFS cannot
> handle this many mounts.
>=20
> --=20
>=20
> ,-._|\ Ian Kent
> / \ Perth, Western Australia
> *_.--._/ E-mail: [email protected]
> v Web: http://themaw.net/
>=20
>=20
>=20
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>=20
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