Re: Configuring large numbers of disks

[Kay Sievers <kay.sievers@vrfy.org>]

On Tue, Oct 11, 2005 at 11:35:29AM -0700, Mark Haverkamp wrote:
> On Tue, 2005-10-11 at 20:25 +0200, Kay Sievers wrote:
> > On Mon, Oct 10, 2005 at 01:14:51PM -0700, Mark Haverkamp wrote:
> > > I have 4000 fibrechannel LUNs connected to my system.  There are two
> > > paths to the devices and two ports on the host connected via a switch.
> > > This gives 16000 when probed.  All of the devices are being configured
> > > and appear in /sys/block.  I have had problems getting all of the
> > > entries in /dev created.  I have been able to get udev to create all the
> > > entries in /dev if I recompile udevd to increase the netlink setsockopt
> > > SO_RCVBUF to 16384 * 1024 from the original 1024 * 1024.
> > 
> > Did you allow such a big socket buffer? What does:
> >   grep . /proc/sys/net/core/*
> > print on that box?
> 
> # grep . /proc/sys/net/core/*
> /proc/sys/net/core/dev_weight:64
> /proc/sys/net/core/message_burst:10
> /proc/sys/net/core/message_cost:5
> /proc/sys/net/core/netdev_budget:300
> /proc/sys/net/core/netdev_max_backlog:1000
> /proc/sys/net/core/optmem_max:20480
> /proc/sys/net/core/rmem_default:131072
> /proc/sys/net/core/rmem_max:131071
> /proc/sys/net/core/somaxconn:128
> /proc/sys/net/core/wmem_default:131072
> /proc/sys/net/core/wmem_max:131071
> 
> Although before I start udevd I issue sysctl commands to increase the
> maximum buffer sizes.
> 
> sysctl -w net.core.rmem_max\x16777216
> sysctl -w net.core.wmem_max\x16777216

I will make udevd to force it itself with the new option, so that will
no longer be needed.

Kay


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