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From: Doug Rabson <dfr@rabson.org>
To: Henri Hennebert <hlh@restart.be>
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Date: Tue, 2 Jun 2009 09:23:52 +0100
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Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org
Subject: Re: /boot/loader can't load kernel if too many pool/devices
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On 1 Jun 2009, at 11:22, Henri Hennebert wrote:

> Hello,
>
> During my tests (succesful) to directly boot from ZFS (with zfsboot  
> and gptzfsboot) I encounter the error "can't boot 'kernel'" if too  
> many devices/pools are connected to the machine. In my case:
>
> 2 SAS disks with 2 pools
> 2 SATA disks with 2 pools
> 1 USB key with one pool
>
> `heap` command:
>
> Active Allocations: 171/173
> 536576 bytes reserved 527800 bytes allocated
>
> `ls` command:
>
> open '/' failed: too many open files
>
> If I reboot without the USB key all is OK.
>
> If I reboot from the USB key after disconnecting 2 disks all is OK.
>
> By the way, the /boot/loader in 7.2-STABLE don't work, complains  
> about forth not found.
>
> The previous tests were made with 7.2-STABLE (May 31) with /boot/ 
> loader from 8.0-CURRENT.

I recently increased the number of file descriptors available for / 
boot/loader. Could you rebuild and try again please. Make sure you  
rebuild libstand.a as well as /boot/loader.