Re: Configuring large numbers of disks

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

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?

> I'd like some advice if that is the best way to go. Or is there some
> other way to do this without recompiling?

2.6.13 got new sockopts to set a reasonable limit without making
it global with sysctrl:
  http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h°573dea1fb32ebc72ffa05980fd840df1d80860
We will probably use this in the next udev release.

Anyway, we may need to switch to a reliable transport instead of netlink,
if it still causes problems.

Thanks,
Kay


-------------------------------------------------------
This SF.Net email is sponsored by:
Power Architecture Resource Center: Free content, downloads, discussions,
and more. http://solutions.newsforge.com/ibmarch.tmpl
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel