problem booting to multi-vdev root pool [Was: kern/150503: [zfs] ZFS disks are UNAVAIL and corrupted after reboot]

Niclas Zeising zeising at
Fri Nov 16 16:13:19 UTC 2012

On 11/16/12 16:45, Andriy Gapon wrote:
> on 13/11/2012 18:16 Guido Falsi said the following:
>> My idea, but is just a speculation, i could be very wrong, is that the geom
>> tasting code has some problem with multiple vdev root pools.
> Guido,
> you are absolutely correct.  The code for reconstructing/tasting a root pool
> configuration is a modified upstream code, so it inherited a limitation from it:
> the support for only a single top-level vdev in a root pool.
> I have an idea how to add the missing support, but it turned out not to be
> something that I can hack together in couple of hours.
> So, instead I wrote the following patch that should fall back to using a root pool
> configuration from zpool.cache (if it's present there) for a multi-vdev root pool:
> The patch also fixes a minor (single-time) memory leak.
> Guido, Bartosz,
> could you please test the patch?
> Apologies for the breakage.

Just to confirm, since I am holding back an update pending on this.
If I have a raidz root pool, with three disks, like this:
         NAME           STATE     READ WRITE CKSUM
         zroot          ONLINE       0     0     0
           raidz1-0     ONLINE       0     0     0
             gpt/disk0  ONLINE       0     0     0
             gpt/disk1  ONLINE       0     0     0
             gpt/disk2  ONLINE       0     0     0

Then I'm fine to update without issues. the problem is only if, as an 
example, you have a mirror with striped disks, or a stripe with mirrored 
disks, which it seems to me the original poster had.
Am I correct, and therefore ok to update?
Niclas Zeising

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