ZFS partitioning

[Joshua Isom]

You may not want to mirror the boot block.  That way you can update one 
boot block, test it before copying the other.  If the new boot block 
fails to boot, the BIOS should go to the next hard drive and boot the 
mirror.  I don't know if it's possible to detect which drive you're 
actually booting from to know for sure it worked though.  A back up is 
better than a mirror.  With a mirror, you're more likely to fail to boot.

On 5/12/2013 12:26 PM, Paul Kraus wrote:
> On May 12, 2013, at 9:48 AM, Outback Dingo <outbackdingo at gmail.com> wrote:
>
>> notice my boot pool is a mirror, so disk 2 is identical to disk1, so if
>> disk1 ever dies, logically i could boot from disk two
>
> 	The zpool mirror does not mirror the bootblock. You need to manually add that to all the drives you may want to boot from.
>
>> pool: tank
>> state: ONLINE
>>   scan: scrub repaired 0 in 0h0m with 0 errors on Sat May 11 13:20:41 2013
>> config:
>>
>>         NAME        STATE     READ WRITE CKSUM
>>         tank        ONLINE       0     0     0
>>           mirror-0  ONLINE       0     0     0
>>             da34p3  ONLINE       0     0     0
>>             da35p3  ONLINE       0     0     0
>>
>> errors: No known data errors
>
> --
> Paul Kraus
> Deputy Technical Director, LoneStarCon 3
> Sound Coordinator, Schenectady Light Opera Company
>
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