Using GTP and glabel for ZFS arrays

[Boris Samorodov]

Charles Sprickman <spork at bway.net> writes:
> On Thu, 22 Jul 2010, Boris Samorodov wrote:
>> On Wed, 21 Jul 2010 23:15:41 -0400 Dan Langille wrote:
>>> On 7/21/2010 11:05 PM, Dan Langille wrote (something close to this):
>>
>>>> First, create a new GUID Partition Table partition scheme on the HDD:
>>>> gpart create -s GPT ad0
>>>>
>>>> Let's see how much space we have. This output will be used to determine
>>>> SOMEVALUE in the next command.
>>>>
>>>> gpart show
>>>>
>>>> Create a new partition within that scheme:
>>>> gpart add -b 34 -s SOMEVALUE -t freebsd-zfs ad0
>>>>
>>>> Now, label the thing:
>>>> glabel label -v disk00 /dev/ad0
>>
>> That command will destroy secondary GPT.
>
> I was just reading about GUID partitioning last night and saw that one
> of the benefits is that there's a copy of the partition table kept at
> the end of the disk.  That seems like a pretty neat feature.
>
> Do you by any chance have a reference I can point to (I was
> documenting stuff about GPT in an internal wiki and this is a nice
> piece of info to have)?
>
> Also, how does one access/use the "backup" partition table?

http://en.wikipedia.org/wiki/GUID_Partition_Table

-- 
WBR, bsam