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Date: Sat, 02 Jun 2012 21:19:38 -0700
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From: Randy Bush <randy@psg.com>
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Cc: FreeBSD FS <freebsd-fs@freebsd.org>
Subject: Re: hptrr disk labeling
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>> i have an hptrr controller with 12-16 2tb satas on it.  a picture
>> before i started cleaning up some disk failures.
>> 
>>         NAME                STATE     READ WRITE CKSUM
>>         tank                ONLINE       0     0     0
>>           mirror            ONLINE       0     0     0
>>             label/m00-d01   ONLINE       0     0     0
>>             label/m00-d00   ONLINE       0     0     0
>>           mirror            ONLINE       0     0     0
>>             label/m01-d00   ONLINE       0     0     0
>>             label/m01-d01   ONLINE       0     0     0
>> 
>> the reason i used glabels was because when the system boots or the
>> controller rescans, it assigns da0 to the first drive it finds alive on
>> the controller, da1 to the second, etc.
>> 
>> this means that drive addition or removal changes the daX numbering.
>> 
>> so the labels are so that zfs can find its ass when assembling the
>> array.
> 
> Can you use GPT for partitioning? Put a single partition on each disk and
> set the GPT label (which is not the glabel). See gpart's add and modify
> subcommands.
> 
> 	NAME                          STATE     READ WRITE CKSUM
> 	gs1p                          ONLINE       0     0     0
> 	  mirror                      ONLINE       0     0     0
> 	    gpt/CONST_2-9XE02KPK-zfs  ONLINE       0     0     0
> 	    gpt/SAVVIO-6XQ10F80-zfs   ONLINE       0     0     0
> 	    gpt/SAVVIO-6XQ103C7-zfs   ONLINE       0     0     0

ok.  sure i could do that.  but what's the win?

randy