Re: ZFS boot on zfs mirror

on 26/05/2009 19:21 George Hartzell said the following:
Dmitry Morozovsky writes:
> On Tue, 26 May 2009, Mickael MAILLOT wrote:
>
> MM> Hi,
> MM>
> MM> i prefere use zfsboot boot sector, an example is better than a long talk:
> MM>
> MM> $ zpool create tank mirror ad4 ad6
> MM> $ zpool export tank
> MM> $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1
> MM> $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1
> MM> $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1 seek=1024
> MM> $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1 seek=1024
>
> s/skeep/skip/ ? ;-)

What is the reason for copying zfsboot one bit at a time, as opposed
to

dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=2

seek=1024 for the second part? and no 'count=1' for it? :-)

[Just guessing] Apparently the first block of zfsboot is some form of MBR and the
rest is zfs-specific code that goes to magical sector 1024.

--
Andriy Gapon
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