gptzfsboot very slow

[Steven Hartland]

----- Original Message ----- 
From: "David Wimsey" <dwimsey at rtsz.com>


> My file server is configured with zfs root based on http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/Mirror
> 
> When booting, after it gets past the BIOS drive C: is
> disk0 (one line for each of the 6 drives as expected)
> part, drops to a new line and the rotating twiddle
> starts its bit.  At first it moves a long at a almost
> normal looking speed, then it starts only ticking away
> slowly, maybe once or twice a minute.
> ...

You don't say what version your running but we had the same
issue and the attached patch fixes it for us by reducing
the amount of slices tasted during the boot process.

I believe there's some on going work to improve the boot
process which includes reduction in the amount of tastes
of disks / partitions which may be a better option but the
patch works for us on 8.3-RELEASE.

In addition if you have a large amount of memory setting
the following in /boot/loader.conf can also significantly
reduced your boot time.
hw.memtest.tests="0"

    Regards
    Steve

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