From owner-freebsd-performance@FreeBSD.ORG  Wed Jan 30 15:18:40 2008
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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: newfs locks entire machine for 20seconds
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Steven Hartland wrote:

> The machine is running with ULE on 7.0 as mention using an Areca 1220
> controller over 8 disks in RAID 6 + Hotspare.

I'd suggest you first try to reproduce the stall without ULE, while
keeping all other parameters exactly the same.