Issues with multiple-vdev ZFS root

[Peter Maloney]

On 01/19/2012 09:17 PM, Dmitry Marakasov wrote:
> * Dmitry Marakasov (amdmi3 at hades.panopticon) wrote:
>
> Just for the note: I've switched to multiple-vdev root pool
> configuration on a real machine and it works well.
>
> 	NAME        STATE     READ WRITE CKSUM
> 	hades       ONLINE       0     0     0
> 	  mirror-0  ONLINE       0     0     0
> 	    ada0p3  ONLINE       0     0     0
> 	    ada1p3  ONLINE       0     0     0
> 	  mirror-1  ONLINE       0     0     0
> 	    ada2p3  ONLINE       0     0     0
> 	    ada3p3  ONLINE       0     0     0
>
> root has 1 copies and I've tried to copy it over, so it's likely
> located on the second mirror, still the system is bootable and I
> haven't seen any problems at all.
>
> The questions still remain, as this configuration is not really
> documented.
>
To test your virtualbox one disk theory, you could create a sliced up
root pool on a single disk:

# gpart show
=>        34         ...  da1  GPT  (10G)
          34        2014        - free -  (1M)
        2048         128     1  freebsd-boot  (64k)
        2176        1920        - free -  (960k)
        4096         ...     2  freebsd-zfs  (2G)
         ...         ...     3  freebsd-zfs  (2G)
         ...         ...     4  freebsd-zfs  (2G)
         ...         ...     5  freebsd-zfs  (2G)


# zpool status zroot
...
        NAME             STATE     READ WRITE CKSUM
        zroot            ONLINE       0     0     0
          mirror-0       ONLINE       0     0     0
            gpt/root1    ONLINE       0     0     0
            gpt/root2    ONLINE       0     0     0
          mirror-1       ONLINE       0     0     0
            gpt/root3    ONLINE       0     0     0
            gpt/root4    ONLINE       0     0     0


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Peter Maloney
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