On 24.05.2011 17:20, Victor Balada Diaz wrote: > Ie, no 16 sector offset in it. So my question is... What's the proper way of > doing a MBR + BSD label partition and where is it documented? what are the > different > bootcodes and when is needed each one?[1]
gptboot is used for GPT scheme. It should be written to the partition with type "freebsd-boot". And it searches in the GPT table partitions with type "freebsd-ufs" to boot from. gptzfsboot is also used for GPT, but it searches ZFS pools on the partitions with type "freebsd-zfs". zfsboot is used for MBR and BSD schemes to boot from ZFS. > also, how do i know about offsets each partitioning scheme needs? shouldn't > GEOM > take care of it without user needing to know anything about it? Usually you do not need to know anything about offsets. > If i wanted to also align partition to 1 MB offsets so i can get better > performance > with advanced format drives and RAID controllers, what would be the best > option? > I guess that i would need to add the first freebsd-ufs partition starting at > 1985 > sector, because 1 MB = 2048 512byte sector, and 63 are reserved for MBR scheme > so 2048 - 63 = 1985. Is this right or i'm mistaken in something? Yes, you are right. > Seems that gpart man page only documents doing it with GPT and doesn't talk > about alignment constraints, but i can't use GPT because i want to do it over > gmirror and last sector is used by gpt and gmirror at the same time causing > some warnings[2]. You can create GPT on top of your mirror. It will cause some warnings, but all should work. -- WBR, Andrey V. Elsukov
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