allow to mount root from a pool not in zpool.cache

[Steven Hartland]

----- Original Message ----- 
From: "Andriy Gapon" <avg at FreeBSD.org>

> Currently FreeBSD ZFS kernel code doesn't allow to mount root filesystem on a
> pool that is not listed in zpool.cache as only pools from the cache are known to
> ZFS at that time.
> 
> This patch is an attempt to improve the behavior:
> http://people.freebsd.org/~avg/spa_import_rootpool.diff
> 
> This could be useful when importing pools that were exported from other systems.
> There is a tunable vfs.zfs.rootpool.prefer_cached_config which is set to 1 by
> default.  1 means just use a cached pool config if it's found in the cache, 0
> means to re-probe disks and read supposedly latest/actual config in any case.

This sounds like a great idea, thanks for the work will look to test it over
the coming weeks.

    Regards
    Steve

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