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Date:      Thu, 26 Nov 2009 18:10:10 +0700
From:      Edho P Arief <edhoprima@gmail.com>
To:        Scot Hetzel <swhetzel@gmail.com>
Cc:        freebsd-stable@freebsd.org, Jeremy Chadwick <freebsd@jdc.parodius.com>
Subject:   Re: Can't use gpt labels re-importing pool
Message-ID:  <a3780c060911260310m4974f809oe2370e716b60f663@mail.gmail.com>
In-Reply-To: <790a9fff0911260229u40d9f499w28a7ce46e1f92467@mail.gmail.com>
References:  <4B0E3ABA.3030606@tzim.net> <790a9fff0911260040i1456d7c0j4f8327d24d2966cf@mail.gmail.com> <20091126085034.GA51998@icarus.home.lan> <790a9fff0911260229u40d9f499w28a7ce46e1f92467@mail.gmail.com>

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On Thu, Nov 26, 2009 at 5:29 PM, Scot Hetzel <swhetzel@gmail.com> wrote:
> On 11/26/09, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote:
>> I'm a bit curious about something, so maybe someone can help me
>> =C2=A0understand:
>>
>> =C2=A0Why are people bothering with GPT labels (or in some cases, glabel=
s)
>> =C2=A0when AHCI (whether it be ataahci.ko or ahci.ko) is in use? =C2=A0U=
nder what
>> =C2=A0circumstance would the device name change dynamically in this situ=
ation?
>>
>
> There was a thread about this problem where the drives had changed
> their device names due to a change in the kernel drive =C2=A0(Current lis=
t
> from July):
>
> http://lists.freebsd.org/pipermail/freebsd-current/2009-July/009377.html
>
> Through out this thread there were various suggests on how he could
> recover the system, and prevent the problem from occurring in the
> future.
>
> One of the suggestions was that use of zpool replace to change from
> device names to using glabel labels.
>
> http://lists.freebsd.org/pipermail/freebsd-current/2009-July/009440.html
>
>> =C2=A0I've never witnessed this happening with AHCI, at least on Intel
>> =C2=A0systems, and I've hot-swapped hard disks many times over.
>>
>
> Using glabels, gpt labels, or gptid solves the problem of not needing
> to remember which device name the drive originally had. =C2=A0For instanc=
e,
> on a zfs zraid pool with 3 disks (ad1 ad2 ad3) you could disconnect
> the pool from one computer and connect it to another system and it
> wouldn't matter which order you reconnected the drives (1 2 3 or 3 =C2=A0=
1
> 2) as the pool would still be recognized when it is imported on the
> new system. =C2=A0Also if the new system already has drives ad1 and ad2, =
it
> wouldn't matter.
>
> Scot


for some reasons it sounds to me like 'avoiding problem' since device
name shouldn't matter in zfs (or so I read)


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